1 /* Xstormy16 cpu description.
2 Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002
3 Free Software Foundation, Inc.
4 Contributed by Red Hat, Inc.
6 This file is part of GNU CC.
8 GNU CC is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2, or (at your option)
13 GNU CC is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with GNU CC; see the file COPYING. If not, write to
20 the Free Software Foundation, 59 Temple Place - Suite 330,
21 Boston, MA 02111-1307, USA. */
24 /* Driver configuration */
26 /* Defined in svr4.h. */
27 /* #define SWITCH_TAKES_ARG(CHAR) */
29 /* Defined in svr4.h. */
30 /* #define WORD_SWITCH_TAKES_ARG(NAME) */
32 /* Defined in svr4.h. */
36 /* Defined in svr4.h. */
37 /* #define ASM_FINAL_SPEC "" */
39 /* Defined in svr4.h. */
40 /* #define LINK_SPEC "" */
43 - If -msim is specified, everything is built and linked as for the sim.
44 - If -T is specified, that linker script is used, and it should provide
45 appropriate libraries.
46 - If neither is specified, everything is built as for the sim, but no
47 I/O support is assumed.
51 #define LIB_SPEC "-( -lc %{msim:-lsim}%{!msim:%{!T*:-lnosys}} -)"
53 /* Defined in svr4.h. */
55 #define STARTFILE_SPEC "crt0.o%s crti.o%s crtbegin.o%s"
57 /* Defined in svr4.h. */
59 #define ENDFILE_SPEC "crtend.o%s crtn.o%s"
61 /* Defined in svr4.h for host compilers. */
62 /* #define MD_EXEC_PREFIX "" */
64 /* Defined in svr4.h for host compilers. */
65 /* #define MD_STARTFILE_PREFIX "" */
68 /* Run-time target specifications */
70 #define CPP_PREDEFINES "-Dxstormy16 -Amachine=xstormy16 -D__INT_MAX__=32767"
72 /* This declaration should be present. */
73 extern int target_flags;
75 #define TARGET_SWITCHES \
76 {{ "sim", 0, "Provide libraries for the simulator" }, \
79 #define TARGET_VERSION fprintf (stderr, " (xstormy16 cpu core)");
81 #define CAN_DEBUG_WITHOUT_FP
86 #define BITS_BIG_ENDIAN 1
88 #define BYTES_BIG_ENDIAN 0
90 #define WORDS_BIG_ENDIAN 0
92 #define BITS_PER_UNIT 8
94 #define BITS_PER_WORD 16
96 #define UNITS_PER_WORD 2
98 #define POINTER_SIZE 16
100 #define PROMOTE_MODE(MODE,UNSIGNEDP,TYPE) \
102 if (GET_MODE_CLASS (MODE) == MODE_INT \
103 && GET_MODE_SIZE (MODE) < 2) \
107 #define PROMOTE_FUNCTION_ARGS 1
109 #define PROMOTE_FUNCTION_RETURN 1
111 #define PARM_BOUNDARY 16
113 #define STACK_BOUNDARY 16
115 #define FUNCTION_BOUNDARY 16
117 #define BIGGEST_ALIGNMENT 16
119 /* Defined in svr4.h. */
120 /* #define MAX_OFILE_ALIGNMENT */
122 #define DATA_ALIGNMENT(TYPE, ALIGN) \
123 (TREE_CODE (TYPE) == ARRAY_TYPE \
124 && TYPE_MODE (TREE_TYPE (TYPE)) == QImode \
125 && (ALIGN) < BITS_PER_WORD ? BITS_PER_WORD : (ALIGN))
127 #define CONSTANT_ALIGNMENT(EXP, ALIGN) \
128 (TREE_CODE (EXP) == STRING_CST \
129 && (ALIGN) < BITS_PER_WORD ? BITS_PER_WORD : (ALIGN))
131 #define STRICT_ALIGNMENT 1
133 /* Defined in svr4.h. */
134 #define PCC_BITFIELD_TYPE_MATTERS 1
136 #define TARGET_FLOAT_FORMAT IEEE_FLOAT_FORMAT
139 /* Layout of Source Language Data Types */
141 #define INT_TYPE_SIZE 16
143 #define SHORT_TYPE_SIZE 16
145 #define LONG_TYPE_SIZE 32
147 #define LONG_LONG_TYPE_SIZE 64
149 #define CHAR_TYPE_SIZE 8
151 #define FLOAT_TYPE_SIZE 32
153 #define DOUBLE_TYPE_SIZE 64
155 #define LONG_DOUBLE_TYPE_SIZE 64
157 #define DEFAULT_SIGNED_CHAR 0
159 /* Defined in svr4.h. */
160 #define SIZE_TYPE "unsigned int"
162 /* Defined in svr4.h. */
163 #define PTRDIFF_TYPE "int"
165 /* Defined in svr4.h, to "long int". */
166 /* #define WCHAR_TYPE "long int" */
168 /* Defined in svr4.h. */
169 #undef WCHAR_TYPE_SIZE
170 #define WCHAR_TYPE_SIZE 32
172 /* Define this macro if the type of Objective C selectors should be `int'.
174 If this macro is not defined, then selectors should have the type `struct
176 /* #define OBJC_INT_SELECTORS */
179 /* Register Basics */
181 /* Number of hardware registers known to the compiler. They receive numbers 0
182 through `FIRST_PSEUDO_REGISTER-1'; thus, the first pseudo register's number
183 really is assigned the number `FIRST_PSEUDO_REGISTER'. */
184 #define FIRST_PSEUDO_REGISTER 19
186 /* An initializer that says which registers are used for fixed purposes all
187 throughout the compiled code and are therefore not available for general
188 allocation. These would include the stack pointer, the frame pointer
189 (except on machines where that can be used as a general register when no
190 frame pointer is needed), the program counter on machines where that is
191 considered one of the addressable registers, and any other numbered register
194 This information is expressed as a sequence of numbers, separated by commas
195 and surrounded by braces. The Nth number is 1 if register N is fixed, 0
198 The table initialized from this macro, and the table initialized by the
199 following one, may be overridden at run time either automatically, by the
200 actions of the macro `CONDITIONAL_REGISTER_USAGE', or by the user with the
201 command options `-ffixed-REG', `-fcall-used-REG' and `-fcall-saved-REG'. */
202 #define FIXED_REGISTERS \
203 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 1, 1 }
205 /* Like `FIXED_REGISTERS' but has 1 for each register that is clobbered (in
206 general) by function calls as well as for fixed registers. This macro
207 therefore identifies the registers that are not available for general
208 allocation of values that must live across function calls.
210 If a register has 0 in `CALL_USED_REGISTERS', the compiler automatically
211 saves it on function entry and restores it on function exit, if the register
212 is used within the function. */
213 #define CALL_USED_REGISTERS \
214 { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 1 }
216 /* Zero or more C statements that may conditionally modify two variables
217 `fixed_regs' and `call_used_regs' (both of type `char []') after they have
218 been initialized from the two preceding macros.
220 This is necessary in case the fixed or call-clobbered registers depend on
223 You need not define this macro if it has no work to do.
225 If the usage of an entire class of registers depends on the target flags,
226 you may indicate this to GCC by using this macro to modify `fixed_regs' and
227 `call_used_regs' to 1 for each of the registers in the classes which should
228 not be used by GCC. Also define the macro `REG_CLASS_FROM_LETTER' to return
229 `NO_REGS' if it is called with a letter for a class that shouldn't be used.
231 (However, if this class is not included in `GENERAL_REGS' and all of the
232 insn patterns whose constraints permit this class are controlled by target
233 switches, then GCC will automatically avoid using these registers when the
234 target switches are opposed to them.) */
235 /* #define CONDITIONAL_REGISTER_USAGE */
237 /* If this macro is defined and has a nonzero value, it means that `setjmp' and
238 related functions fail to save the registers, or that `longjmp' fails to
239 restore them. To compensate, the compiler avoids putting variables in
240 registers in functions that use `setjmp'. */
241 /* #define NON_SAVING_SETJMP */
243 /* Define this macro if the target machine has register windows. This C
244 expression returns the register number as seen by the called function
245 corresponding to the register number OUT as seen by the calling function.
246 Return OUT if register number OUT is not an outbound register. */
247 /* #define INCOMING_REGNO(OUT) */
249 /* Define this macro if the target machine has register windows. This C
250 expression returns the register number as seen by the calling function
251 corresponding to the register number IN as seen by the called function.
252 Return IN if register number IN is not an inbound register. */
253 /* #define OUTGOING_REGNO(IN) */
256 /* Order of allocation of registers */
258 /* If defined, an initializer for a vector of integers, containing the numbers
259 of hard registers in the order in which GNU CC should prefer to use them
260 (from most preferred to least).
262 If this macro is not defined, registers are used lowest numbered first (all
265 One use of this macro is on machines where the highest numbered registers
266 must always be saved and the save-multiple-registers instruction supports
267 only sequences of consecutive registers. On such machines, define
268 `REG_ALLOC_ORDER' to be an initializer that lists the highest numbered
269 allocatable register first. */
270 #define REG_ALLOC_ORDER { 7, 6, 5, 4, 3, 2, 1, 0, 9, 8, 10, 11, 12, 13, 14, 15, 16 }
272 /* A C statement (sans semicolon) to choose the order in which to allocate hard
273 registers for pseudo-registers local to a basic block.
275 Store the desired register order in the array `reg_alloc_order'. Element 0
276 should be the register to allocate first; element 1, the next register; and
279 The macro body should not assume anything about the contents of
280 `reg_alloc_order' before execution of the macro.
282 On most machines, it is not necessary to define this macro. */
283 /* #define ORDER_REGS_FOR_LOCAL_ALLOC */
286 /* How Values Fit in Registers */
288 /* A C expression for the number of consecutive hard registers, starting at
289 register number REGNO, required to hold a value of mode MODE.
291 On a machine where all registers are exactly one word, a suitable definition
294 #define HARD_REGNO_NREGS(REGNO, MODE) \
295 ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) \
296 / UNITS_PER_WORD)) */
297 #define HARD_REGNO_NREGS(REGNO, MODE) \
298 ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD)
300 /* A C expression that is nonzero if it is permissible to store a value of mode
301 MODE in hard register number REGNO (or in several registers starting with
302 that one). For a machine where all registers are equivalent, a suitable
305 #define HARD_REGNO_MODE_OK(REGNO, MODE) 1
307 It is not necessary for this macro to check for the numbers of fixed
308 registers, because the allocation mechanism considers them to be always
311 On some machines, double-precision values must be kept in even/odd register
312 pairs. The way to implement that is to define this macro to reject odd
313 register numbers for such modes.
315 The minimum requirement for a mode to be OK in a register is that the
316 `movMODE' instruction pattern support moves between the register and any
317 other hard register for which the mode is OK; and that moving a value into
318 the register and back out not alter it.
320 Since the same instruction used to move `SImode' will work for all narrower
321 integer modes, it is not necessary on any machine for `HARD_REGNO_MODE_OK'
322 to distinguish between these modes, provided you define patterns `movhi',
323 etc., to take advantage of this. This is useful because of the interaction
324 between `HARD_REGNO_MODE_OK' and `MODES_TIEABLE_P'; it is very desirable for
325 all integer modes to be tieable.
327 Many machines have special registers for floating point arithmetic. Often
328 people assume that floating point machine modes are allowed only in floating
329 point registers. This is not true. Any registers that can hold integers
330 can safely *hold* a floating point machine mode, whether or not floating
331 arithmetic can be done on it in those registers. Integer move instructions
332 can be used to move the values.
334 On some machines, though, the converse is true: fixed-point machine modes
335 may not go in floating registers. This is true if the floating registers
336 normalize any value stored in them, because storing a non-floating value
337 there would garble it. In this case, `HARD_REGNO_MODE_OK' should reject
338 fixed-point machine modes in floating registers. But if the floating
339 registers do not automatically normalize, if you can store any bit pattern
340 in one and retrieve it unchanged without a trap, then any machine mode may
341 go in a floating register, so you can define this macro to say so.
343 The primary significance of special floating registers is rather that they
344 are the registers acceptable in floating point arithmetic instructions.
345 However, this is of no concern to `HARD_REGNO_MODE_OK'. You handle it by
346 writing the proper constraints for those instructions.
348 On some machines, the floating registers are especially slow to access, so
349 that it is better to store a value in a stack frame than in such a register
350 if floating point arithmetic is not being done. As long as the floating
351 registers are not in class `GENERAL_REGS', they will not be used unless some
352 pattern's constraint asks for one. */
353 #define HARD_REGNO_MODE_OK(REGNO, MODE) ((REGNO) != 16 || (MODE) == BImode)
355 /* A C expression that is nonzero if it is desirable to choose register
356 allocation so as to avoid move instructions between a value of mode MODE1
357 and a value of mode MODE2.
359 If `HARD_REGNO_MODE_OK (R, MODE1)' and `HARD_REGNO_MODE_OK (R, MODE2)' are
360 ever different for any R, then `MODES_TIEABLE_P (MODE1, MODE2)' must be
362 #define MODES_TIEABLE_P(MODE1, MODE2) ((MODE1) != BImode && (MODE2) != BImode)
364 /* Define this macro if the compiler should avoid copies to/from CCmode
365 registers. You should only define this macro if support fo copying to/from
366 CCmode is incomplete. */
367 /* #define AVOID_CCMODE_COPIES */
370 /* Handling Leaf Functions */
372 /* A C initializer for a vector, indexed by hard register number, which
373 contains 1 for a register that is allowable in a candidate for leaf function
376 If leaf function treatment involves renumbering the registers, then the
377 registers marked here should be the ones before renumbering--those that GNU
378 CC would ordinarily allocate. The registers which will actually be used in
379 the assembler code, after renumbering, should not be marked with 1 in this
382 Define this macro only if the target machine offers a way to optimize the
383 treatment of leaf functions. */
384 /* #define LEAF_REGISTERS */
386 /* A C expression whose value is the register number to which REGNO should be
387 renumbered, when a function is treated as a leaf function.
389 If REGNO is a register number which should not appear in a leaf function
390 before renumbering, then the expression should yield -1, which will cause
391 the compiler to abort.
393 Define this macro only if the target machine offers a way to optimize the
394 treatment of leaf functions, and registers need to be renumbered to do this. */
395 /* #define LEAF_REG_REMAP(REGNO) */
398 /* Registers That Form a Stack. */
400 /* Define this if the machine has any stack-like registers. */
401 /* #define STACK_REGS */
403 /* The number of the first stack-like register. This one is the top
405 /* #define FIRST_STACK_REG */
407 /* The number of the last stack-like register. This one is the
408 bottom of the stack. */
409 /* #define LAST_STACK_REG */
412 /* Register Classes */
414 /* An enumeral type that must be defined with all the register class names as
415 enumeral values. `NO_REGS' must be first. `ALL_REGS' must be the last
416 register class, followed by one more enumeral value, `LIM_REG_CLASSES',
417 which is not a register class but rather tells how many classes there are.
419 Each register class has a number, which is the value of casting the class
420 name to type `int'. The number serves as an index in many of the tables
438 /* The number of distinct register classes, defined as follows:
440 #define N_REG_CLASSES (int) LIM_REG_CLASSES */
441 #define N_REG_CLASSES ((int) LIM_REG_CLASSES)
443 /* An initializer containing the names of the register classes as C string
444 constants. These names are used in writing some of the debugging dumps. */
445 #define REG_CLASS_NAMES \
460 /* An initializer containing the contents of the register classes, as integers
461 which are bit masks. The Nth integer specifies the contents of class N.
462 The way the integer MASK is interpreted is that register R is in the class
463 if `MASK & (1 << R)' is 1.
465 When the machine has more than 32 registers, an integer does not suffice.
466 Then the integers are replaced by sub-initializers, braced groupings
467 containing several integers. Each sub-initializer must be suitable as an
468 initializer for the type `HARD_REG_SET' which is defined in
470 #define REG_CLASS_CONTENTS \
482 { (1 << FIRST_PSEUDO_REGISTER) - 1 } \
485 /* A C expression whose value is a register class containing hard register
486 REGNO. In general there is more than one such class; choose a class which
487 is "minimal", meaning that no smaller class also contains the register. */
488 #define REGNO_REG_CLASS(REGNO) \
489 ((REGNO) == 0 ? R0_REGS \
490 : (REGNO) == 1 ? R1_REGS \
491 : (REGNO) == 2 ? R2_REGS \
492 : (REGNO) < 8 ? EIGHT_REGS \
493 : (REGNO) == 8 ? R8_REGS \
494 : (REGNO) == 16 ? CARRY_REGS \
495 : (REGNO) <= 18 ? GENERAL_REGS \
498 /* A macro whose definition is the name of the class to which a valid base
499 register must belong. A base register is one used in an address which is
500 the register value plus a displacement. */
501 #define BASE_REG_CLASS GENERAL_REGS
503 /* A macro whose definition is the name of the class to which a valid index
504 register must belong. An index register is one used in an address where its
505 value is either multiplied by a scale factor or added to another register
506 (as well as added to a displacement). */
507 #define INDEX_REG_CLASS GENERAL_REGS
509 /* A C expression which defines the machine-dependent operand constraint
510 letters for register classes. If CHAR is such a letter, the value should be
511 the register class corresponding to it. Otherwise, the value should be
512 `NO_REGS'. The register letter `r', corresponding to class `GENERAL_REGS',
513 will not be passed to this macro; you do not need to handle it.
515 The following letters are unavailable, due to being used as
520 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P'
521 'Q', 'R', 'S', 'T', 'U'
523 'g', 'i', 'm', 'n', 'o', 'p', 'r', 's' */
525 #define REG_CLASS_FROM_LETTER(CHAR) \
526 ( (CHAR) == 'a' ? R0_REGS \
527 : (CHAR) == 'b' ? R1_REGS \
528 : (CHAR) == 'c' ? R2_REGS \
529 : (CHAR) == 'd' ? R8_REGS \
530 : (CHAR) == 'e' ? EIGHT_REGS \
531 : (CHAR) == 't' ? TWO_REGS \
532 : (CHAR) == 'y' ? CARRY_REGS \
533 : (CHAR) == 'z' ? ICALL_REGS \
536 /* A C expression which is nonzero if register number NUM is suitable for use
537 as a base register in operand addresses. It may be either a suitable hard
538 register or a pseudo register that has been allocated such a hard register. */
539 #define REGNO_OK_FOR_BASE_P(NUM) 1
541 /* A C expression which is nonzero if register number NUM is suitable for use
542 as an index register in operand addresses. It may be either a suitable hard
543 register or a pseudo register that has been allocated such a hard register.
545 The difference between an index register and a base register is that the
546 index register may be scaled. If an address involves the sum of two
547 registers, neither one of them scaled, then either one may be labeled the
548 "base" and the other the "index"; but whichever labeling is used must fit
549 the machine's constraints of which registers may serve in each capacity.
550 The compiler will try both labelings, looking for one that is valid, and
551 will reload one or both registers only if neither labeling works. */
552 #define REGNO_OK_FOR_INDEX_P(NUM) REGNO_OK_FOR_BASE_P (NUM)
554 /* A C expression that places additional restrictions on the register class to
555 use when it is necessary to copy value X into a register in class CLASS.
556 The value is a register class; perhaps CLASS, or perhaps another, smaller
557 class. On many machines, the following definition is safe:
559 #define PREFERRED_RELOAD_CLASS(X,CLASS) CLASS
561 Sometimes returning a more restrictive class makes better code. For
562 example, on the 68000, when X is an integer constant that is in range for a
563 `moveq' instruction, the value of this macro is always `DATA_REGS' as long
564 as CLASS includes the data registers. Requiring a data register guarantees
565 that a `moveq' will be used.
567 If X is a `const_double', by returning `NO_REGS' you can force X into a
568 memory constant. This is useful on certain machines where immediate
569 floating values cannot be loaded into certain kinds of registers.
571 This declaration must be present. */
572 #define PREFERRED_RELOAD_CLASS(X, CLASS) \
573 xstormy16_preferred_reload_class (X, CLASS)
575 /* Like `PREFERRED_RELOAD_CLASS', but for output reloads instead of input
576 reloads. If you don't define this macro, the default is to use CLASS,
578 #define PREFERRED_OUTPUT_RELOAD_CLASS(X, CLASS) \
579 xstormy16_preferred_reload_class (X, CLASS)
581 /* A C expression that places additional restrictions on the register class to
582 use when it is necessary to be able to hold a value of mode MODE in a reload
583 register for which class CLASS would ordinarily be used.
585 Unlike `PREFERRED_RELOAD_CLASS', this macro should be used when there are
586 certain modes that simply can't go in certain reload classes.
588 The value is a register class; perhaps CLASS, or perhaps another, smaller
591 Don't define this macro unless the target machine has limitations which
592 require the macro to do something nontrivial. */
593 /* #define LIMIT_RELOAD_CLASS(MODE, CLASS) */
595 /* Many machines have some registers that cannot be copied directly to or from
596 memory or even from other types of registers. An example is the `MQ'
597 register, which on most machines, can only be copied to or from general
598 registers, but not memory. Some machines allow copying all registers to and
599 from memory, but require a scratch register for stores to some memory
600 locations (e.g., those with symbolic address on the RT, and those with
601 certain symbolic address on the Sparc when compiling PIC). In some cases,
602 both an intermediate and a scratch register are required.
604 You should define these macros to indicate to the reload phase that it may
605 need to allocate at least one register for a reload in addition to the
606 register to contain the data. Specifically, if copying X to a register
607 CLASS in MODE requires an intermediate register, you should define
608 `SECONDARY_INPUT_RELOAD_CLASS' to return the largest register class all of
609 whose registers can be used as intermediate registers or scratch registers.
611 If copying a register CLASS in MODE to X requires an intermediate or scratch
612 register, `SECONDARY_OUTPUT_RELOAD_CLASS' should be defined to return the
613 largest register class required. If the requirements for input and output
614 reloads are the same, the macro `SECONDARY_RELOAD_CLASS' should be used
615 instead of defining both macros identically.
617 The values returned by these macros are often `GENERAL_REGS'. Return
618 `NO_REGS' if no spare register is needed; i.e., if X can be directly copied
619 to or from a register of CLASS in MODE without requiring a scratch register.
620 Do not define this macro if it would always return `NO_REGS'.
622 If a scratch register is required (either with or without an intermediate
623 register), you should define patterns for `reload_inM' or `reload_outM', as
624 required.. These patterns, which will normally be implemented with a
625 `define_expand', should be similar to the `movM' patterns, except that
626 operand 2 is the scratch register.
628 Define constraints for the reload register and scratch register that contain
629 a single register class. If the original reload register (whose class is
630 CLASS) can meet the constraint given in the pattern, the value returned by
631 these macros is used for the class of the scratch register. Otherwise, two
632 additional reload registers are required. Their classes are obtained from
633 the constraints in the insn pattern.
635 X might be a pseudo-register or a `subreg' of a pseudo-register, which could
636 either be in a hard register or in memory. Use `true_regnum' to find out;
637 it will return -1 if the pseudo is in memory and the hard register number if
640 These macros should not be used in the case where a particular class of
641 registers can only be copied to memory and not to another class of
642 registers. In that case, secondary reload registers are not needed and
643 would not be helpful. Instead, a stack location must be used to perform the
644 copy and the `movM' pattern should use memory as an intermediate storage.
645 This case often occurs between floating-point and general registers. */
647 /* This chip has the interesting property that only the first eight
648 registers can be moved to/from memory. */
649 #define SECONDARY_RELOAD_CLASS(CLASS, MODE, X) \
650 xstormy16_secondary_reload_class (CLASS, MODE, X)
652 /* #define SECONDARY_INPUT_RELOAD_CLASS(CLASS, MODE, X) */
653 /* #define SECONDARY_OUTPUT_RELOAD_CLASS(CLASS, MODE, X) */
655 /* Certain machines have the property that some registers cannot be copied to
656 some other registers without using memory. Define this macro on those
657 machines to be a C expression that is non-zero if objects of mode M in
658 registers of CLASS1 can only be copied to registers of class CLASS2 by
659 storing a register of CLASS1 into memory and loading that memory location
660 into a register of CLASS2.
662 Do not define this macro if its value would always be zero. */
663 /* #define SECONDARY_MEMORY_NEEDED(CLASS1, CLASS2, M) */
665 /* Normally when `SECONDARY_MEMORY_NEEDED' is defined, the compiler allocates a
666 stack slot for a memory location needed for register copies. If this macro
667 is defined, the compiler instead uses the memory location defined by this
670 Do not define this macro if you do not define
671 `SECONDARY_MEMORY_NEEDED'. */
672 /* #define SECONDARY_MEMORY_NEEDED_RTX(MODE) */
674 /* When the compiler needs a secondary memory location to copy between two
675 registers of mode MODE, it normally allocates sufficient memory to hold a
676 quantity of `BITS_PER_WORD' bits and performs the store and load operations
677 in a mode that many bits wide and whose class is the same as that of MODE.
679 This is right thing to do on most machines because it ensures that all bits
680 of the register are copied and prevents accesses to the registers in a
681 narrower mode, which some machines prohibit for floating-point registers.
683 However, this default behavior is not correct on some machines, such as the
684 DEC Alpha, that store short integers in floating-point registers differently
685 than in integer registers. On those machines, the default widening will not
686 work correctly and you must define this macro to suppress that widening in
687 some cases. See the file `alpha.h' for details.
689 Do not define this macro if you do not define `SECONDARY_MEMORY_NEEDED' or
690 if widening MODE to a mode that is `BITS_PER_WORD' bits wide is correct for
692 /* #define SECONDARY_MEMORY_NEEDED_MODE(MODE) */
694 /* Normally the compiler avoids choosing registers that have been explicitly
695 mentioned in the rtl as spill registers (these registers are normally those
696 used to pass parameters and return values). However, some machines have so
697 few registers of certain classes that there would not be enough registers to
698 use as spill registers if this were done.
700 Define `SMALL_REGISTER_CLASSES' to be an expression with a non-zero value on
701 these machines. When this macro has a non-zero value, the compiler allows
702 registers explicitly used in the rtl to be used as spill registers but
703 avoids extending the lifetime of these registers.
705 It is always safe to define this macro with a non-zero value, but if you
706 unnecessarily define it, you will reduce the amount of optimizations that
707 can be performed in some cases. If you do not define this macro with a
708 non-zero value when it is required, the compiler will run out of spill
709 registers and print a fatal error message. For most machines, you should
710 not define this macro at all. */
711 /* #define SMALL_REGISTER_CLASSES */
713 /* A C expression whose value is nonzero if pseudos that have been assigned to
714 registers of class CLASS would likely be spilled because registers of CLASS
715 are needed for spill registers.
717 The default value of this macro returns 1 if CLASS has exactly one register
718 and zero otherwise. On most machines, this default should be used. Only
719 define this macro to some other expression if pseudo allocated by
720 `local-alloc.c' end up in memory because their hard registers were needed
721 for spill registers. If this macro returns nonzero for those classes, those
722 pseudos will only be allocated by `global.c', which knows how to reallocate
723 the pseudo to another register. If there would not be another register
724 available for reallocation, you should not change the definition of this
725 macro since the only effect of such a definition would be to slow down
726 register allocation. */
727 /* #define CLASS_LIKELY_SPILLED_P(CLASS) */
729 /* A C expression for the maximum number of consecutive registers of
730 class CLASS needed to hold a value of mode MODE.
732 This is closely related to the macro `HARD_REGNO_NREGS'. In fact, the value
733 of the macro `CLASS_MAX_NREGS (CLASS, MODE)' should be the maximum value of
734 `HARD_REGNO_NREGS (REGNO, MODE)' for all REGNO values in the class CLASS.
736 This macro helps control the handling of multiple-word values in
739 This declaration is required. */
740 #define CLASS_MAX_NREGS(CLASS, MODE) \
741 ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD)
743 /* If defined, a C expression for a class that contains registers which the
744 compiler must always access in a mode that is the same size as the mode in
745 which it loaded the register.
747 For the example, loading 32-bit integer or floating-point objects into
748 floating-point registers on the Alpha extends them to 64-bits. Therefore
749 loading a 64-bit object and then storing it as a 32-bit object does not
750 store the low-order 32-bits, as would be the case for a normal register.
751 Therefore, `alpha.h' defines this macro as `FLOAT_REGS'. */
752 /* #define CLASS_CANNOT_CHANGE_SIZE */
754 /* A C expression that defines the machine-dependent operand constraint letters
755 (`I', `J', `K', .. 'P') that specify particular ranges of integer values.
756 If C is one of those letters, the expression should check that VALUE, an
757 integer, is in the appropriate range and return 1 if so, 0 otherwise. If C
758 is not one of those letters, the value should be 0 regardless of VALUE. */
759 #define CONST_OK_FOR_LETTER_P(VALUE, C) \
760 ( (C) == 'I' ? (VALUE) >= 0 && (VALUE) <= 3 \
761 : (C) == 'J' ? exact_log2 (VALUE) != -1 \
762 : (C) == 'K' ? exact_log2 (~(VALUE)) != -1 \
763 : (C) == 'L' ? (VALUE) >= 0 && (VALUE) <= 255 \
764 : (C) == 'M' ? (VALUE) >= -255 && (VALUE) <= 0 \
765 : (C) == 'N' ? (VALUE) >= -3 && (VALUE) <= 0 \
766 : (C) == 'O' ? (VALUE) >= 1 && (VALUE) <= 4 \
767 : (C) == 'P' ? (VALUE) >= -4 && (VALUE) <= -1 \
770 /* A C expression that defines the machine-dependent operand constraint letters
771 (`G', `H') that specify particular ranges of `const_double' values.
773 If C is one of those letters, the expression should check that VALUE, an RTX
774 of code `const_double', is in the appropriate range and return 1 if so, 0
775 otherwise. If C is not one of those letters, the value should be 0
778 `const_double' is used for all floating-point constants and for `DImode'
779 fixed-point constants. A given letter can accept either or both kinds of
780 values. It can use `GET_MODE' to distinguish between these kinds. */
781 #define CONST_DOUBLE_OK_FOR_LETTER_P(VALUE, C) 0
783 /* A C expression that defines the optional machine-dependent constraint
784 letters (`Q', `R', `S', `T', `U') that can be used to segregate specific
785 types of operands, usually memory references, for the target machine.
786 Normally this macro will not be defined. If it is required for a particular
787 target machine, it should return 1 if VALUE corresponds to the operand type
788 represented by the constraint letter C. If C is not defined as an extra
789 constraint, the value returned should be 0 regardless of VALUE.
791 For example, on the ROMP, load instructions cannot have their output in r0
792 if the memory reference contains a symbolic address. Constraint letter `Q'
793 is defined as representing a memory address that does *not* contain a
794 symbolic address. An alternative is specified with a `Q' constraint on the
795 input and `r' on the output. The next alternative specifies `m' on the
796 input and a register class that does not include r0 on the output. */
797 #define EXTRA_CONSTRAINT(VALUE, C) \
798 xstormy16_extra_constraint_p (VALUE, C)
801 /* Basic Stack Layout */
803 /* Define this macro if pushing a word onto the stack moves the stack pointer
804 to a smaller address.
806 When we say, "define this macro if ...," it means that the compiler checks
807 this macro only with `#ifdef' so the precise definition used does not
809 /* #define STACK_GROWS_DOWNWARD */
811 /* We want to use post-increment instructions to push things on the stack,
812 because we don't have any pre-increment ones. */
813 #define STACK_PUSH_CODE POST_INC
815 /* Define this macro if the addresses of local variable slots are at negative
816 offsets from the frame pointer. */
817 /* #define FRAME_GROWS_DOWNWARD */
819 /* Define this macro if successive arguments to a function occupy decreasing
820 addresses on the stack. */
821 #define ARGS_GROW_DOWNWARD 1
823 /* Offset from the frame pointer to the first local variable slot to be
826 If `FRAME_GROWS_DOWNWARD', find the next slot's offset by
827 subtracting the first slot's length from `STARTING_FRAME_OFFSET'.
828 Otherwise, it is found by adding the length of the first slot to
829 the value `STARTING_FRAME_OFFSET'. */
830 #define STARTING_FRAME_OFFSET 0
832 /* Offset from the stack pointer register to the first location at which
833 outgoing arguments are placed. If not specified, the default value of zero
834 is used. This is the proper value for most machines.
836 If `ARGS_GROW_DOWNWARD', this is the offset to the location above the first
837 location at which outgoing arguments are placed. */
838 /* #define STACK_POINTER_OFFSET */
840 /* Offset from the argument pointer register to the first argument's address.
841 On some machines it may depend on the data type of the function.
843 If `ARGS_GROW_DOWNWARD', this is the offset to the location above the first
844 argument's address. */
845 #define FIRST_PARM_OFFSET(FUNDECL) 0
847 /* Offset from the stack pointer register to an item dynamically allocated on
848 the stack, e.g., by `alloca'.
850 The default value for this macro is `STACK_POINTER_OFFSET' plus the length
851 of the outgoing arguments. The default is correct for most machines. See
852 `function.c' for details. */
853 /* #define STACK_DYNAMIC_OFFSET(FUNDECL) */
855 /* A C expression whose value is RTL representing the address in a stack frame
856 where the pointer to the caller's frame is stored. Assume that FRAMEADDR is
857 an RTL expression for the address of the stack frame itself.
859 If you don't define this macro, the default is to return the value of
860 FRAMEADDR--that is, the stack frame address is also the address of the stack
861 word that points to the previous frame. */
862 /* #define DYNAMIC_CHAIN_ADDRESS(FRAMEADDR) */
864 /* If defined, a C expression that produces the machine-specific code to setup
865 the stack so that arbitrary frames can be accessed. For example, on the
866 Sparc, we must flush all of the register windows to the stack before we can
867 access arbitrary stack frames. This macro will seldom need to be defined. */
868 /* #define SETUP_FRAME_ADDRESSES() */
870 /* A C expression whose value is RTL representing the value of the return
871 address for the frame COUNT steps up from the current frame, after the
872 prologue. FRAMEADDR is the frame pointer of the COUNT frame, or the frame
873 pointer of the COUNT - 1 frame if `RETURN_ADDR_IN_PREVIOUS_FRAME' is
876 The value of the expression must always be the correct address when COUNT is
877 zero, but may be `NULL_RTX' if there is not way to determine the return
878 address of other frames. */
879 #define RETURN_ADDR_RTX(COUNT, FRAMEADDR) \
881 ? gen_rtx_MEM (Pmode, arg_pointer_rtx) \
884 /* Define this if the return address of a particular stack frame is
885 accessed from the frame pointer of the previous stack frame. */
886 /* #define RETURN_ADDR_IN_PREVIOUS_FRAME */
888 /* A C expression whose value is RTL representing the location of the incoming
889 return address at the beginning of any function, before the prologue. This
890 RTL is either a `REG', indicating that the return value is saved in `REG',
891 or a `MEM' representing a location in the stack.
893 You only need to define this macro if you want to support call frame
894 debugging information like that provided by DWARF 2. */
895 #define INCOMING_RETURN_ADDR_RTX \
896 gen_rtx_MEM (SImode, gen_rtx_PLUS (Pmode, stack_pointer_rtx, GEN_INT (-4)))
898 /* A C expression whose value is an integer giving the offset, in bytes, from
899 the value of the stack pointer register to the top of the stack frame at the
900 beginning of any function, before the prologue. The top of the frame is
901 defined to be the value of the stack pointer in the previous frame, just
902 before the call instruction.
904 You only need to define this macro if you want to support call frame
905 debugging information like that provided by DWARF 2. */
906 #define INCOMING_FRAME_SP_OFFSET (xstormy16_interrupt_function_p () ? 6 : 4)
909 /* Stack Checking. */
911 /* A nonzero value if stack checking is done by the configuration files in a
912 machine-dependent manner. You should define this macro if stack checking is
913 require by the ABI of your machine or if you would like to have to stack
914 checking in some more efficient way than GNU CC's portable approach. The
915 default value of this macro is zero. */
916 /* #define STACK_CHECK_BUILTIN */
918 /* An integer representing the interval at which GNU CC must generate stack
919 probe instructions. You will normally define this macro to be no larger
920 than the size of the "guard pages" at the end of a stack area. The default
921 value of 4096 is suitable for most systems. */
922 /* #define STACK_CHECK_PROBE_INTERVAL */
924 /* A integer which is nonzero if GNU CC should perform the stack probe as a
925 load instruction and zero if GNU CC should use a store instruction. The
926 default is zero, which is the most efficient choice on most systems. */
927 /* #define STACK_CHECK_PROBE_LOAD */
929 /* The number of bytes of stack needed to recover from a stack overflow, for
930 languages where such a recovery is supported. The default value of 75 words
931 should be adequate for most machines. */
932 /* #define STACK_CHECK_PROTECT */
934 /* The maximum size of a stack frame, in bytes. GNU CC will generate probe
935 instructions in non-leaf functions to ensure at least this many bytes of
936 stack are available. If a stack frame is larger than this size, stack
937 checking will not be reliable and GNU CC will issue a warning. The default
938 is chosen so that GNU CC only generates one instruction on most systems.
939 You should normally not change the default value of this macro. */
940 /* #define STACK_CHECK_MAX_FRAME_SIZE */
942 /* GNU CC uses this value to generate the above warning message. It represents
943 the amount of fixed frame used by a function, not including space for any
944 callee-saved registers, temporaries and user variables. You need only
945 specify an upper bound for this amount and will normally use the default of
947 /* #define STACK_CHECK_FIXED_FRAME_SIZE */
949 /* The maximum size, in bytes, of an object that GNU CC will place in the fixed
950 area of the stack frame when the user specifies `-fstack-check'. GNU CC
951 computed the default from the values of the above macros and you will
952 normally not need to override that default. */
953 /* #define STACK_CHECK_MAX_VAR_SIZE */
956 /* Register That Address the Stack Frame. */
958 /* The register number of the stack pointer register, which must also be a
959 fixed register according to `FIXED_REGISTERS'. On most machines, the
960 hardware determines which register this is. */
961 #define STACK_POINTER_REGNUM 15
963 /* The register number of the frame pointer register, which is used to access
964 automatic variables in the stack frame. On some machines, the hardware
965 determines which register this is. On other machines, you can choose any
966 register you wish for this purpose. */
967 #define FRAME_POINTER_REGNUM 17
969 /* On some machines the offset between the frame pointer and starting offset of
970 the automatic variables is not known until after register allocation has
971 been done (for example, because the saved registers are between these two
972 locations). On those machines, define `FRAME_POINTER_REGNUM' the number of
973 a special, fixed register to be used internally until the offset is known,
974 and define `HARD_FRAME_POINTER_REGNUM' to be actual the hard register number
975 used for the frame pointer.
977 You should define this macro only in the very rare circumstances when it is
978 not possible to calculate the offset between the frame pointer and the
979 automatic variables until after register allocation has been completed.
980 When this macro is defined, you must also indicate in your definition of
981 `ELIMINABLE_REGS' how to eliminate `FRAME_POINTER_REGNUM' into either
982 `HARD_FRAME_POINTER_REGNUM' or `STACK_POINTER_REGNUM'.
984 Do not define this macro if it would be the same as `FRAME_POINTER_REGNUM'. */
985 #define HARD_FRAME_POINTER_REGNUM 13
987 /* The register number of the arg pointer register, which is used to access the
988 function's argument list. On some machines, this is the same as the frame
989 pointer register. On some machines, the hardware determines which register
990 this is. On other machines, you can choose any register you wish for this
991 purpose. If this is not the same register as the frame pointer register,
992 then you must mark it as a fixed register according to `FIXED_REGISTERS', or
993 arrange to be able to eliminate it. */
994 #define ARG_POINTER_REGNUM 18
996 /* The register number of the return address pointer register, which is used to
997 access the current function's return address from the stack. On some
998 machines, the return address is not at a fixed offset from the frame pointer
999 or stack pointer or argument pointer. This register can be defined to point
1000 to the return address on the stack, and then be converted by
1001 `ELIMINABLE_REGS' into either the frame pointer or stack pointer.
1003 Do not define this macro unless there is no other way to get the return
1004 address from the stack. */
1005 /* #define RETURN_ADDRESS_POINTER_REGNUM */
1007 /* Register numbers used for passing a function's static chain pointer. If
1008 register windows are used, the register number as seen by the called
1009 function is `STATIC_CHAIN_INCOMING_REGNUM', while the register number as
1010 seen by the calling function is `STATIC_CHAIN_REGNUM'. If these registers
1011 are the same, `STATIC_CHAIN_INCOMING_REGNUM' need not be defined.
1013 The static chain register need not be a fixed register.
1015 If the static chain is passed in memory, these macros should not be defined;
1016 instead, the next two macros should be defined. */
1017 #define STATIC_CHAIN_REGNUM 1
1018 /* #define STATIC_CHAIN_INCOMING_REGNUM */
1020 /* If the static chain is passed in memory, these macros provide rtx giving
1021 `mem' expressions that denote where they are stored. `STATIC_CHAIN' and
1022 `STATIC_CHAIN_INCOMING' give the locations as seen by the calling and called
1023 functions, respectively. Often the former will be at an offset from the
1024 stack pointer and the latter at an offset from the frame pointer.
1026 The variables `stack_pointer_rtx', `frame_pointer_rtx', and
1027 `arg_pointer_rtx' will have been initialized prior to the use of these
1028 macros and should be used to refer to those items.
1030 If the static chain is passed in a register, the two previous
1031 macros should be defined instead. */
1032 /* #define STATIC_CHAIN */
1033 /* #define STATIC_CHAIN_INCOMING */
1036 /* Eliminating the Frame Pointer and the Arg Pointer */
1038 /* A C expression which is nonzero if a function must have and use a frame
1039 pointer. This expression is evaluated in the reload pass. If its value is
1040 nonzero the function will have a frame pointer.
1042 The expression can in principle examine the current function and decide
1043 according to the facts, but on most machines the constant 0 or the constant
1044 1 suffices. Use 0 when the machine allows code to be generated with no
1045 frame pointer, and doing so saves some time or space. Use 1 when there is
1046 no possible advantage to avoiding a frame pointer.
1048 In certain cases, the compiler does not know how to produce valid code
1049 without a frame pointer. The compiler recognizes those cases and
1050 automatically gives the function a frame pointer regardless of what
1051 `FRAME_POINTER_REQUIRED' says. You don't need to worry about them.
1053 In a function that does not require a frame pointer, the frame pointer
1054 register can be allocated for ordinary usage, unless you mark it as a fixed
1055 register. See `FIXED_REGISTERS' for more information. */
1056 #define FRAME_POINTER_REQUIRED 0
1058 /* A C statement to store in the variable DEPTH_VAR the difference between the
1059 frame pointer and the stack pointer values immediately after the function
1060 prologue. The value would be computed from information such as the result
1061 of `get_frame_size ()' and the tables of registers `regs_ever_live' and
1064 If `ELIMINABLE_REGS' is defined, this macro will be not be used and need not
1065 be defined. Otherwise, it must be defined even if `FRAME_POINTER_REQUIRED'
1066 is defined to always be true; in that case, you may set DEPTH_VAR to
1068 /* #define INITIAL_FRAME_POINTER_OFFSET(DEPTH_VAR) */
1070 /* If defined, this macro specifies a table of register pairs used to eliminate
1071 unneeded registers that point into the stack frame. If it is not defined,
1072 the only elimination attempted by the compiler is to replace references to
1073 the frame pointer with references to the stack pointer.
1075 The definition of this macro is a list of structure initializations, each of
1076 which specifies an original and replacement register.
1079 #define ELIMINABLE_REGS \
1081 {FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM}, \
1082 {FRAME_POINTER_REGNUM, HARD_FRAME_POINTER_REGNUM}, \
1083 {ARG_POINTER_REGNUM, STACK_POINTER_REGNUM}, \
1084 {ARG_POINTER_REGNUM, HARD_FRAME_POINTER_REGNUM}, \
1087 /* A C expression that returns non-zero if the compiler is allowed to try to
1088 replace register number FROM with register number TO. This macro need only
1089 be defined if `ELIMINABLE_REGS' is defined, and will usually be the constant
1090 1, since most of the cases preventing register elimination are things that
1091 the compiler already knows about. */
1093 #define CAN_ELIMINATE(FROM, TO) \
1094 ((FROM) == ARG_POINTER_REGNUM && (TO) == STACK_POINTER_REGNUM \
1095 ? ! frame_pointer_needed \
1098 /* This macro is similar to `INITIAL_FRAME_POINTER_OFFSET'. It specifies the
1099 initial difference between the specified pair of registers. This macro must
1100 be defined if `ELIMINABLE_REGS' is defined. */
1101 #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET) \
1102 (OFFSET) = xstormy16_initial_elimination_offset (FROM, TO)
1105 /* Passing Function Arguments on the Stack */
1107 /* Define this macro if an argument declared in a prototype as an integral type
1108 smaller than `int' should actually be passed as an `int'. In addition to
1109 avoiding errors in certain cases of mismatch, it also makes for better code
1110 on certain machines. */
1111 #define PROMOTE_PROTOTYPES 1
1113 /* A C expression that is the number of bytes actually pushed onto the stack
1114 when an instruction attempts to push NPUSHED bytes.
1116 If the target machine does not have a push instruction, do not define this
1117 macro. That directs GNU CC to use an alternate strategy: to allocate the
1118 entire argument block and then store the arguments into it.
1120 On some machines, the definition
1122 #define PUSH_ROUNDING(BYTES) (BYTES)
1124 will suffice. But on other machines, instructions that appear to push one
1125 byte actually push two bytes in an attempt to maintain alignment. Then the
1126 definition should be
1128 #define PUSH_ROUNDING(BYTES) (((BYTES) + 1) & ~1) */
1129 #define PUSH_ROUNDING(BYTES) (((BYTES) + 1) & ~1)
1131 /* If defined, the maximum amount of space required for outgoing arguments will
1132 be computed and placed into the variable
1133 `current_function_outgoing_args_size'. No space will be pushed onto the
1134 stack for each call; instead, the function prologue should increase the
1135 stack frame size by this amount.
1137 Defining both `PUSH_ROUNDING' and `ACCUMULATE_OUTGOING_ARGS' is not
1139 /* #define ACCUMULATE_OUTGOING_ARGS */
1141 /* Define this macro if functions should assume that stack space has been
1142 allocated for arguments even when their values are passed in registers.
1144 The value of this macro is the size, in bytes, of the area reserved for
1145 arguments passed in registers for the function represented by FNDECL.
1147 This space can be allocated by the caller, or be a part of the
1148 machine-dependent stack frame: `OUTGOING_REG_PARM_STACK_SPACE' says
1150 /* #define REG_PARM_STACK_SPACE(FNDECL) */
1152 /* Define these macros in addition to the one above if functions might allocate
1153 stack space for arguments even when their values are passed in registers.
1154 These should be used when the stack space allocated for arguments in
1155 registers is not a simple constant independent of the function declaration.
1157 The value of the first macro is the size, in bytes, of the area that we
1158 should initially assume would be reserved for arguments passed in registers.
1160 The value of the second macro is the actual size, in bytes, of the area that
1161 will be reserved for arguments passed in registers. This takes two
1162 arguments: an integer representing the number of bytes of fixed sized
1163 arguments on the stack, and a tree representing the number of bytes of
1164 variable sized arguments on the stack.
1166 When these macros are defined, `REG_PARM_STACK_SPACE' will only be called
1167 for libcall functions, the current function, or for a function being called
1168 when it is known that such stack space must be allocated. In each case this
1169 value can be easily computed.
1171 When deciding whether a called function needs such stack space, and how much
1172 space to reserve, GNU CC uses these two macros instead of
1173 `REG_PARM_STACK_SPACE'. */
1174 /* #define MAYBE_REG_PARM_STACK_SPACE */
1175 /* #define FINAL_REG_PARM_STACK_SPACE(CONST_SIZE, VAR_SIZE) */
1177 /* Define this if it is the responsibility of the caller to allocate the area
1178 reserved for arguments passed in registers.
1180 If `ACCUMULATE_OUTGOING_ARGS' is defined, this macro controls whether the
1181 space for these arguments counts in the value of
1182 `current_function_outgoing_args_size'. */
1183 /* #define OUTGOING_REG_PARM_STACK_SPACE */
1185 /* Define this macro if `REG_PARM_STACK_SPACE' is defined, but the stack
1186 parameters don't skip the area specified by it.
1188 Normally, when a parameter is not passed in registers, it is placed on the
1189 stack beyond the `REG_PARM_STACK_SPACE' area. Defining this macro
1190 suppresses this behavior and causes the parameter to be passed on the stack
1191 in its natural location. */
1192 /* #define STACK_PARMS_IN_REG_PARM_AREA */
1194 /* A C expression that should indicate the number of bytes of its own arguments
1195 that a function pops on returning, or 0 if the function pops no arguments
1196 and the caller must therefore pop them all after the function returns.
1198 FUNDECL is a C variable whose value is a tree node that describes the
1199 function in question. Normally it is a node of type `FUNCTION_DECL' that
1200 describes the declaration of the function. From this it is possible to
1201 obtain the DECL_ATTRIBUTES of the function.
1203 FUNTYPE is a C variable whose value is a tree node that describes the
1204 function in question. Normally it is a node of type `FUNCTION_TYPE' that
1205 describes the data type of the function. From this it is possible to obtain
1206 the data types of the value and arguments (if known).
1208 When a call to a library function is being considered, FUNTYPE will contain
1209 an identifier node for the library function. Thus, if you need to
1210 distinguish among various library functions, you can do so by their names.
1211 Note that "library function" in this context means a function used to
1212 perform arithmetic, whose name is known specially in the compiler and was
1213 not mentioned in the C code being compiled.
1215 STACK-SIZE is the number of bytes of arguments passed on the stack. If a
1216 variable number of bytes is passed, it is zero, and argument popping will
1217 always be the responsibility of the calling function.
1219 On the Vax, all functions always pop their arguments, so the definition of
1220 this macro is STACK-SIZE. On the 68000, using the standard calling
1221 convention, no functions pop their arguments, so the value of the macro is
1222 always 0 in this case. But an alternative calling convention is available
1223 in which functions that take a fixed number of arguments pop them but other
1224 functions (such as `printf') pop nothing (the caller pops all). When this
1225 convention is in use, FUNTYPE is examined to determine whether a function
1226 takes a fixed number of arguments. */
1227 #define RETURN_POPS_ARGS(FUNDECL, FUNTYPE, STACK_SIZE) 0
1230 /* Function Arguments in Registers */
1232 #define NUM_ARGUMENT_REGISTERS 6
1233 #define FIRST_ARGUMENT_REGISTER 2
1235 #define XSTORMY16_WORD_SIZE(TYPE, MODE) \
1236 ((((TYPE) ? int_size_in_bytes (TYPE) : GET_MODE_SIZE (MODE)) \
1240 /* A C expression that controls whether a function argument is passed in a
1241 register, and which register.
1243 The arguments are CUM, of type CUMULATIVE_ARGS, which summarizes
1244 (in a way defined by INIT_CUMULATIVE_ARGS and FUNCTION_ARG_ADVANCE)
1245 all of the previous arguments so far passed in registers; MODE, the
1246 machine mode of the argument; TYPE, the data type of the argument
1247 as a tree node or 0 if that is not known (which happens for C
1248 support library functions); and NAMED, which is 1 for an ordinary
1249 argument and 0 for nameless arguments that correspond to `...' in
1250 the called function's prototype.
1252 The value of the expression should either be a `reg' RTX for the hard
1253 register in which to pass the argument, or zero to pass the argument on the
1256 For machines like the Vax and 68000, where normally all arguments are
1257 pushed, zero suffices as a definition.
1259 The usual way to make the ANSI library `stdarg.h' work on a machine where
1260 some arguments are usually passed in registers, is to cause nameless
1261 arguments to be passed on the stack instead. This is done by making
1262 `FUNCTION_ARG' return 0 whenever NAMED is 0.
1264 You may use the macro `MUST_PASS_IN_STACK (MODE, TYPE)' in the definition of
1265 this macro to determine if this argument is of a type that must be passed in
1266 the stack. If `REG_PARM_STACK_SPACE' is not defined and `FUNCTION_ARG'
1267 returns non-zero for such an argument, the compiler will abort. If
1268 `REG_PARM_STACK_SPACE' is defined, the argument will be computed in the
1269 stack and then loaded into a register. */
1270 #define FUNCTION_ARG(CUM, MODE, TYPE, NAMED) \
1271 ((MODE) == VOIDmode ? const0_rtx \
1272 : (CUM) + XSTORMY16_WORD_SIZE (TYPE, MODE) > NUM_ARGUMENT_REGISTERS ? 0 \
1273 : gen_rtx_REG (MODE, (CUM) + 2))
1275 /* Define this macro if the target machine has "register windows", so that the
1276 register in which a function sees an arguments is not necessarily the same
1277 as the one in which the caller passed the argument.
1279 For such machines, `FUNCTION_ARG' computes the register in which the caller
1280 passes the value, and `FUNCTION_INCOMING_ARG' should be defined in a similar
1281 fashion to tell the function being called where the arguments will arrive.
1283 If `FUNCTION_INCOMING_ARG' is not defined, `FUNCTION_ARG' serves both
1285 /* #define FUNCTION_INCOMING_ARG(CUM, MODE, TYPE, NAMED) */
1287 /* A C expression for the number of words, at the beginning of an argument,
1288 must be put in registers. The value must be zero for arguments that are
1289 passed entirely in registers or that are entirely pushed on the stack.
1291 On some machines, certain arguments must be passed partially in registers
1292 and partially in memory. On these machines, typically the first N words of
1293 arguments are passed in registers, and the rest on the stack. If a
1294 multi-word argument (a `double' or a structure) crosses that boundary, its
1295 first few words must be passed in registers and the rest must be pushed.
1296 This macro tells the compiler when this occurs, and how many of the words
1297 should go in registers.
1299 `FUNCTION_ARG' for these arguments should return the first register to be
1300 used by the caller for this argument; likewise `FUNCTION_INCOMING_ARG', for
1301 the called function. */
1302 #define FUNCTION_ARG_PARTIAL_NREGS(CUM, MODE, TYPE, NAMED) 0
1304 /* A C expression that indicates when an argument must be passed by reference.
1305 If nonzero for an argument, a copy of that argument is made in memory and a
1306 pointer to the argument is passed instead of the argument itself. The
1307 pointer is passed in whatever way is appropriate for passing a pointer to
1310 On machines where `REG_PARM_STACK_SPACE' is not defined, a suitable
1311 definition of this macro might be
1312 #define FUNCTION_ARG_PASS_BY_REFERENCE(CUM, MODE, TYPE, NAMED) \
1313 MUST_PASS_IN_STACK (MODE, TYPE) */
1314 #define FUNCTION_ARG_PASS_BY_REFERENCE(CUM, MODE, TYPE, NAMED) 0
1316 /* If defined, a C expression that indicates when it is more
1317 desirable to keep an argument passed by invisible reference as a
1318 reference, rather than copying it to a pseudo register. */
1319 /* #define FUNCTION_ARG_KEEP_AS_REFERENCE(CUM, MODE, TYPE, NAMED) */
1321 /* If defined, a C expression that indicates when it is the called function's
1322 responsibility to make a copy of arguments passed by invisible reference.
1323 Normally, the caller makes a copy and passes the address of the copy to the
1324 routine being called. When FUNCTION_ARG_CALLEE_COPIES is defined and is
1325 nonzero, the caller does not make a copy. Instead, it passes a pointer to
1326 the "live" value. The called function must not modify this value. If it
1327 can be determined that the value won't be modified, it need not make a copy;
1328 otherwise a copy must be made. */
1329 /* #define FUNCTION_ARG_CALLEE_COPIES(CUM, MODE, TYPE, NAMED) */
1331 /* A C type for declaring a variable that is used as the first argument of
1332 `FUNCTION_ARG' and other related values. For some target machines, the type
1333 `int' suffices and can hold the number of bytes of argument so far.
1335 There is no need to record in `CUMULATIVE_ARGS' anything about the arguments
1336 that have been passed on the stack. The compiler has other variables to
1337 keep track of that. For target machines on which all arguments are passed
1338 on the stack, there is no need to store anything in `CUMULATIVE_ARGS';
1339 however, the data structure must exist and should not be empty, so use
1342 For this platform, the value of CUMULATIVE_ARGS is the number of words
1343 of arguments that have been passed in registers so far. */
1344 typedef int CUMULATIVE_ARGS;
1346 /* A C statement (sans semicolon) for initializing the variable CUM for the
1347 state at the beginning of the argument list. The variable has type
1348 `CUMULATIVE_ARGS'. The value of FNTYPE is the tree node for the data type
1349 of the function which will receive the args, or 0 if the args are to a
1350 compiler support library function. The value of INDIRECT is nonzero when
1351 processing an indirect call, for example a call through a function pointer.
1352 The value of INDIRECT is zero for a call to an explicitly named function, a
1353 library function call, or when `INIT_CUMULATIVE_ARGS' is used to find
1354 arguments for the function being compiled.
1356 When processing a call to a compiler support library function, LIBNAME
1357 identifies which one. It is a `symbol_ref' rtx which contains the name of
1358 the function, as a string. LIBNAME is 0 when an ordinary C function call is
1359 being processed. Thus, each time this macro is called, either LIBNAME or
1360 FNTYPE is nonzero, but never both of them at once. */
1361 #define INIT_CUMULATIVE_ARGS(CUM, FNTYPE, LIBNAME, INDIRECT) (CUM) = 0
1363 /* Like `INIT_CUMULATIVE_ARGS' but overrides it for the purposes of finding the
1364 arguments for the function being compiled. If this macro is undefined,
1365 `INIT_CUMULATIVE_ARGS' is used instead.
1367 The value passed for LIBNAME is always 0, since library routines with
1368 special calling conventions are never compiled with GNU CC. The argument
1369 LIBNAME exists for symmetry with `INIT_CUMULATIVE_ARGS'. */
1370 /* #define INIT_CUMULATIVE_INCOMING_ARGS(CUM, FNTYPE, LIBNAME) */
1372 /* A C statement (sans semicolon) to update the summarizer variable CUM to
1373 advance past an argument in the argument list. The values MODE, TYPE and
1374 NAMED describe that argument. Once this is done, the variable CUM is
1375 suitable for analyzing the *following* argument with `FUNCTION_ARG', etc.
1377 This macro need not do anything if the argument in question was passed on
1378 the stack. The compiler knows how to track the amount of stack space used
1379 for arguments without any special help. */
1380 #define FUNCTION_ARG_ADVANCE(CUM, MODE, TYPE, NAMED) \
1381 ((CUM) = xstormy16_function_arg_advance (CUM, MODE, TYPE, NAMED))
1383 /* If defined, a C expression which determines whether, and in which direction,
1384 to pad out an argument with extra space. The value should be of type `enum
1385 direction': either `upward' to pad above the argument, `downward' to pad
1386 below, or `none' to inhibit padding.
1388 The *amount* of padding is always just enough to reach the next multiple of
1389 `FUNCTION_ARG_BOUNDARY'; this macro does not control it.
1391 This macro has a default definition which is right for most systems. For
1392 little-endian machines, the default is to pad upward. For big-endian
1393 machines, the default is to pad downward for an argument of constant size
1394 shorter than an `int', and upward otherwise. */
1395 /* #define FUNCTION_ARG_PADDING(MODE, TYPE) */
1397 /* If defined, a C expression that gives the alignment boundary, in bits, of an
1398 argument with the specified mode and type. If it is not defined,
1399 `PARM_BOUNDARY' is used for all arguments. */
1400 /* #define FUNCTION_ARG_BOUNDARY(MODE, TYPE) */
1402 /* A C expression that is nonzero if REGNO is the number of a hard register in
1403 which function arguments are sometimes passed. This does *not* include
1404 implicit arguments such as the static chain and the structure-value address.
1405 On many machines, no registers can be used for this purpose since all
1406 function arguments are pushed on the stack. */
1407 #define FUNCTION_ARG_REGNO_P(REGNO) \
1408 ((REGNO) >= FIRST_ARGUMENT_REGISTER \
1409 && (REGNO) < FIRST_ARGUMENT_REGISTER + NUM_ARGUMENT_REGISTERS)
1412 /* How Scalar Function Values are Returned */
1414 /* The number of the hard register that is used to return a scalar value from a
1416 #define RETURN_VALUE_REGNUM FIRST_ARGUMENT_REGISTER
1418 /* Define this macro if `-traditional' should not cause functions declared to
1419 return `float' to convert the value to `double'. */
1420 /* #define TRADITIONAL_RETURN_FLOAT */
1422 /* A C expression to create an RTX representing the place where a function
1423 returns a value of data type VALTYPE. VALTYPE is a tree node representing a
1424 data type. Write `TYPE_MODE (VALTYPE)' to get the machine mode used to
1425 represent that type. On many machines, only the mode is relevant.
1426 (Actually, on most machines, scalar values are returned in the same place
1427 regardless of mode).
1429 If `PROMOTE_FUNCTION_RETURN' is defined, you must apply the same promotion
1430 rules specified in `PROMOTE_MODE' if VALTYPE is a scalar type.
1432 If the precise function being called is known, FUNC is a tree node
1433 (`FUNCTION_DECL') for it; otherwise, FUNC is a null pointer. This makes it
1434 possible to use a different value-returning convention for specific
1435 functions when all their calls are known.
1437 `FUNCTION_VALUE' is not used for return vales with aggregate data types,
1438 because these are returned in another way. See `STRUCT_VALUE_REGNUM' and
1439 related macros, below. */
1440 #define FUNCTION_VALUE(VALTYPE, FUNC) \
1441 xstormy16_function_value (VALTYPE, FUNC)
1444 /* Define this macro if the target machine has "register windows" so that the
1445 register in which a function returns its value is not the same as the one in
1446 which the caller sees the value.
1448 For such machines, `FUNCTION_VALUE' computes the register in which the
1449 caller will see the value. `FUNCTION_OUTGOING_VALUE' should be defined in a
1450 similar fashion to tell the function where to put the value.
1452 If `FUNCTION_OUTGOING_VALUE' is not defined, `FUNCTION_VALUE' serves both
1455 `FUNCTION_OUTGOING_VALUE' is not used for return vales with aggregate data
1456 types, because these are returned in another way. See `STRUCT_VALUE_REGNUM'
1457 and related macros, below. */
1458 /* #define FUNCTION_OUTGOING_VALUE(VALTYPE, FUNC) */
1460 /* A C expression to create an RTX representing the place where a library
1461 function returns a value of mode MODE.
1463 Note that "library function" in this context means a compiler support
1464 routine, used to perform arithmetic, whose name is known specially by the
1465 compiler and was not mentioned in the C code being compiled.
1467 The definition of `LIBRARY_VALUE' need not be concerned aggregate data
1468 types, because none of the library functions returns such types. */
1469 #define LIBCALL_VALUE(MODE) gen_rtx_REG (MODE, RETURN_VALUE_REGNUM)
1471 /* A C expression that is nonzero if REGNO is the number of a hard register in
1472 which the values of called function may come back.
1474 A register whose use for returning values is limited to serving as the
1475 second of a pair (for a value of type `double', say) need not be recognized
1476 by this macro. So for most machines, this definition suffices:
1478 #define FUNCTION_VALUE_REGNO_P(N) ((N) == RETURN)
1480 If the machine has register windows, so that the caller and the called
1481 function use different registers for the return value, this macro should
1482 recognize only the caller's register numbers. */
1483 #define FUNCTION_VALUE_REGNO_P(REGNO) ((REGNO) == RETURN_VALUE_REGNUM)
1485 /* Define this macro if `untyped_call' and `untyped_return' need more space
1486 than is implied by `FUNCTION_VALUE_REGNO_P' for saving and restoring an
1487 arbitrary return value. */
1488 /* #define APPLY_RESULT_SIZE */
1491 /* How Large Values are Returned */
1493 /* A C expression which can inhibit the returning of certain function values in
1494 registers, based on the type of value. A nonzero value says to return the
1495 function value in memory, just as large structures are always returned.
1496 Here TYPE will be a C expression of type `tree', representing the data type
1499 Note that values of mode `BLKmode' must be explicitly handled by this macro.
1500 Also, the option `-fpcc-struct-return' takes effect regardless of this
1501 macro. On most systems, it is possible to leave the macro undefined; this
1502 causes a default definition to be used, whose value is the constant 1 for
1503 `BLKmode' values, and 0 otherwise.
1505 Do not use this macro to indicate that structures and unions should always
1506 be returned in memory. You should instead use `DEFAULT_PCC_STRUCT_RETURN'
1507 to indicate this. */
1508 #define RETURN_IN_MEMORY(TYPE) \
1509 (int_size_in_bytes (TYPE) > UNITS_PER_WORD * NUM_ARGUMENT_REGISTERS)
1511 /* Define this macro to be 1 if all structure and union return values must be
1512 in memory. Since this results in slower code, this should be defined only
1513 if needed for compatibility with other compilers or with an ABI. If you
1514 define this macro to be 0, then the conventions used for structure and union
1515 return values are decided by the `RETURN_IN_MEMORY' macro.
1517 If not defined, this defaults to the value 1. */
1518 /* #define DEFAULT_PCC_STRUCT_RETURN 0 */
1520 /* If the structure value address is passed in a register, then
1521 `STRUCT_VALUE_REGNUM' should be the number of that register. */
1522 /* #define STRUCT_VALUE_REGNUM */
1524 /* If the structure value address is not passed in a register, define
1525 `STRUCT_VALUE' as an expression returning an RTX for the place where the
1526 address is passed. If it returns 0, the address is passed as an "invisible"
1528 #define STRUCT_VALUE 0
1530 /* On some architectures the place where the structure value address is found
1531 by the called function is not the same place that the caller put it. This
1532 can be due to register windows, or it could be because the function prologue
1533 moves it to a different place.
1535 If the incoming location of the structure value address is in a register,
1536 define this macro as the register number. */
1537 /* #define STRUCT_VALUE_INCOMING_REGNUM */
1539 /* If the incoming location is not a register, then you should define
1540 `STRUCT_VALUE_INCOMING' as an expression for an RTX for where the called
1541 function should find the value. If it should find the value on the stack,
1542 define this to create a `mem' which refers to the frame pointer. A
1543 definition of 0 means that the address is passed as an "invisible" first
1545 /* #define STRUCT_VALUE_INCOMING */
1547 /* Define this macro if the usual system convention on the target machine for
1548 returning structures and unions is for the called function to return the
1549 address of a static variable containing the value.
1551 Do not define this if the usual system convention is for the caller to pass
1552 an address to the subroutine.
1554 This macro has effect in `-fpcc-struct-return' mode, but it does nothing
1555 when you use `-freg-struct-return' mode. */
1556 /* #define PCC_STATIC_STRUCT_RETURN */
1559 /* Caller-Saves Register Allocation */
1561 /* Define this macro if function calls on the target machine do not preserve
1562 any registers; in other words, if `CALL_USED_REGISTERS' has 1 for all
1563 registers. This macro enables `-fcaller-saves' by default. Eventually that
1564 option will be enabled by default on all machines and both the option and
1565 this macro will be eliminated. */
1566 /* #define DEFAULT_CALLER_SAVES */
1568 /* A C expression to determine whether it is worthwhile to consider placing a
1569 pseudo-register in a call-clobbered hard register and saving and restoring
1570 it around each function call. The expression should be 1 when this is worth
1571 doing, and 0 otherwise.
1573 If you don't define this macro, a default is used which is good on most
1574 machines: `4 * CALLS < REFS'. */
1575 /* #define CALLER_SAVE_PROFITABLE(REFS, CALLS) */
1578 /* Function Entry and Exit */
1580 /* Define this macro as a C expression that is nonzero if the return
1581 instruction or the function epilogue ignores the value of the stack pointer;
1582 in other words, if it is safe to delete an instruction to adjust the stack
1583 pointer before a return from the function.
1585 Note that this macro's value is relevant only for functions for which frame
1586 pointers are maintained. It is never safe to delete a final stack
1587 adjustment in a function that has no frame pointer, and the compiler knows
1588 this regardless of `EXIT_IGNORE_STACK'. */
1589 /* #define EXIT_IGNORE_STACK */
1591 /* Define this macro as a C expression that is nonzero for registers
1592 are used by the epilogue or the `return' pattern. The stack and
1593 frame pointer registers are already be assumed to be used as
1595 #define EPILOGUE_USES(REGNO) \
1596 xstormy16_epilogue_uses (REGNO)
1598 /* Define this macro if the function epilogue contains delay slots to which
1599 instructions from the rest of the function can be "moved". The definition
1600 should be a C expression whose value is an integer representing the number
1601 of delay slots there. */
1602 /* #define DELAY_SLOTS_FOR_EPILOGUE */
1604 /* A C expression that returns 1 if INSN can be placed in delay slot number N
1607 The argument N is an integer which identifies the delay slot now being
1608 considered (since different slots may have different rules of eligibility).
1609 It is never negative and is always less than the number of epilogue delay
1610 slots (what `DELAY_SLOTS_FOR_EPILOGUE' returns). If you reject a particular
1611 insn for a given delay slot, in principle, it may be reconsidered for a
1612 subsequent delay slot. Also, other insns may (at least in principle) be
1613 considered for the so far unfilled delay slot.
1615 The insns accepted to fill the epilogue delay slots are put in an
1616 RTL list made with `insn_list' objects, stored in the variable
1617 `current_function_epilogue_delay_list'. The insn for the first
1618 delay slot comes first in the list. Your definition of the macro
1619 `FUNCTION_EPILOGUE' should fill the delay slots by outputting the
1620 insns in this list, usually by calling `final_scan_insn'.
1622 You need not define this macro if you did not define
1623 `DELAY_SLOTS_FOR_EPILOGUE'. */
1624 /* #define ELIGIBLE_FOR_EPILOGUE_DELAY(INSN, N) */
1626 /* A C compound statement that outputs the assembler code for a thunk function,
1627 used to implement C++ virtual function calls with multiple inheritance. The
1628 thunk acts as a wrapper around a virtual function, adjusting the implicit
1629 object parameter before handing control off to the real function.
1631 First, emit code to add the integer DELTA to the location that contains the
1632 incoming first argument. Assume that this argument contains a pointer, and
1633 is the one used to pass the `this' pointer in C++. This is the incoming
1634 argument *before* the function prologue, e.g. `%o0' on a sparc. The
1635 addition must preserve the values of all other incoming arguments.
1637 After the addition, emit code to jump to FUNCTION, which is a
1638 `FUNCTION_DECL'. This is a direct pure jump, not a call, and does not touch
1639 the return address. Hence returning from FUNCTION will return to whoever
1640 called the current `thunk'.
1642 The effect must be as if @var{function} had been called directly
1643 with the adjusted first argument. This macro is responsible for
1644 emitting all of the code for a thunk function;
1645 TARGET_ASM_FUNCTION_PROLOGUE and TARGET_ASM_FUNCTION_EPILOGUE are
1648 The THUNK_FNDECL is redundant. (DELTA and FUNCTION have already been
1649 extracted from it.) It might possibly be useful on some targets, but
1652 If you do not define this macro, the target-independent code in the C++
1653 frontend will generate a less efficient heavyweight thunk that calls
1654 FUNCTION instead of jumping to it. The generic approach does not support
1656 #define ASM_OUTPUT_MI_THUNK(FILE, THUNK_FNDECL, DELTA, FUNCTION) \
1657 xstormy16_asm_output_mi_thunk (FILE, THUNK_FNDECL, DELTA, FUNCTION)
1660 /* Generating Code for Profiling. */
1662 /* A C statement or compound statement to output to FILE some assembler code to
1663 call the profiling subroutine `mcount'. Before calling, the assembler code
1664 must load the address of a counter variable into a register where `mcount'
1665 expects to find the address. The name of this variable is `LP' followed by
1666 the number LABELNO, so you would generate the name using `LP%d' in a
1669 The details of how the address should be passed to `mcount' are determined
1670 by your operating system environment, not by GNU CC. To figure them out,
1671 compile a small program for profiling using the system's installed C
1672 compiler and look at the assembler code that results.
1674 This declaration must be present, but it can be an abort if profiling is
1677 #define FUNCTION_PROFILER(FILE, LABELNO) abort ()
1679 /* Define this macro if the code for function profiling should come before the
1680 function prologue. Normally, the profiling code comes after. */
1681 /* #define PROFILE_BEFORE_PROLOGUE */
1684 /* If the target has particular reasons why a function cannot be inlined,
1685 it may define the TARGET_CANNOT_INLINE_P. This macro takes one argument,
1686 the DECL describing the function. The function should NULL if the function
1687 *can* be inlined. Otherwise it should return a pointer to a string containing
1688 a message describing why the function could not be inlined. The message will
1689 displayed if the '-Winline' command line switch has been given. If the message
1690 contains a '%s' sequence, this will be replaced by the name of the function. */
1691 /* #define TARGET_CANNOT_INLINE_P(FN_DECL) xstormy16_cannot_inline_p (FN_DECL) */
1693 /* Implementing the Varargs Macros. */
1695 /* If defined, is a C expression that produces the machine-specific code for a
1696 call to `__builtin_saveregs'. This code will be moved to the very beginning
1697 of the function, before any parameter access are made. The return value of
1698 this function should be an RTX that contains the value to use as the return
1699 of `__builtin_saveregs'.
1701 If this macro is not defined, the compiler will output an ordinary call to
1702 the library function `__builtin_saveregs'. */
1703 /* #define EXPAND_BUILTIN_SAVEREGS() */
1705 /* This macro offers an alternative to using `__builtin_saveregs' and defining
1706 the macro `EXPAND_BUILTIN_SAVEREGS'. Use it to store the anonymous register
1707 arguments into the stack so that all the arguments appear to have been
1708 passed consecutively on the stack. Once this is done, you can use the
1709 standard implementation of varargs that works for machines that pass all
1710 their arguments on the stack.
1712 The argument ARGS_SO_FAR is the `CUMULATIVE_ARGS' data structure, containing
1713 the values that obtain after processing of the named arguments. The
1714 arguments MODE and TYPE describe the last named argument--its machine mode
1715 and its data type as a tree node.
1717 The macro implementation should do two things: first, push onto the stack
1718 all the argument registers *not* used for the named arguments, and second,
1719 store the size of the data thus pushed into the `int'-valued variable whose
1720 name is supplied as the argument PRETEND_ARGS_SIZE. The value that you
1721 store here will serve as additional offset for setting up the stack frame.
1723 Because you must generate code to push the anonymous arguments at compile
1724 time without knowing their data types, `SETUP_INCOMING_VARARGS' is only
1725 useful on machines that have just a single category of argument register and
1726 use it uniformly for all data types.
1728 If the argument SECOND_TIME is nonzero, it means that the arguments of the
1729 function are being analyzed for the second time. This happens for an inline
1730 function, which is not actually compiled until the end of the source file.
1731 The macro `SETUP_INCOMING_VARARGS' should not generate any instructions in
1733 #define SETUP_INCOMING_VARARGS(ARGS_SO_FAR, MODE, TYPE, PRETEND_ARGS_SIZE, SECOND_TIME) \
1734 if (! SECOND_TIME) \
1735 xstormy16_setup_incoming_varargs (ARGS_SO_FAR, MODE, TYPE, & PRETEND_ARGS_SIZE)
1737 /* Define this macro if the location where a function argument is passed
1738 depends on whether or not it is a named argument.
1740 This macro controls how the NAMED argument to `FUNCTION_ARG' is set for
1741 varargs and stdarg functions. With this macro defined, the NAMED argument
1742 is always true for named arguments, and false for unnamed arguments. If
1743 this is not defined, but `SETUP_INCOMING_VARARGS' is defined, then all
1744 arguments are treated as named. Otherwise, all named arguments except the
1745 last are treated as named. */
1746 /* #define STRICT_ARGUMENT_NAMING 1 */
1748 /* Build up the stdarg/varargs va_list type tree, assinging it to NODE. If not
1749 defined, it is assumed that va_list is a void * pointer. */
1750 #define BUILD_VA_LIST_TYPE(NODE) \
1751 ((NODE) = xstormy16_build_va_list ())
1753 /* Implement the stdarg/varargs va_start macro. STDARG_P is non-zero if this
1754 is stdarg.h instead of varargs.h. VALIST is the tree of the va_list
1755 variable to initialize. NEXTARG is the machine independent notion of the
1756 'next' argument after the variable arguments. If not defined, a standard
1757 implementation will be defined that works for arguments passed on the stack. */
1758 #define EXPAND_BUILTIN_VA_START(STDARG_P, VALIST, NEXTARG) \
1759 xstormy16_expand_builtin_va_start (STDARG_P, VALIST, NEXTARG)
1761 /* Implement the stdarg/varargs va_arg macro. VALIST is the variable of type
1762 va_list as a tree, TYPE is the type passed to va_arg. */
1763 #define EXPAND_BUILTIN_VA_ARG(VALIST, TYPE) \
1764 xstormy16_expand_builtin_va_arg (VALIST, TYPE)
1766 /* Implement the stdarg/varargs va_end macro. VALIST is the variable of type
1767 va_list as a tree. */
1768 /* #define EXPAND_BUILTIN_VA_END(VALIST) */
1771 /* Trampolines for Nested Functions. */
1773 /* A C statement to output, on the stream FILE, assembler code for a block of
1774 data that contains the constant parts of a trampoline. This code should not
1775 include a label--the label is taken care of automatically. */
1776 /* #define TRAMPOLINE_TEMPLATE(FILE) */
1778 /* The name of a subroutine to switch to the section in which the trampoline
1779 template is to be placed. The default is a value of `readonly_data_section',
1780 which places the trampoline in the section containing read-only data. */
1781 /* #define TRAMPOLINE_SECTION */
1783 /* A C expression for the size in bytes of the trampoline, as an integer. */
1784 #define TRAMPOLINE_SIZE 8
1786 /* Alignment required for trampolines, in bits.
1788 If you don't define this macro, the value of `BIGGEST_ALIGNMENT' is used for
1789 aligning trampolines. */
1790 #define TRAMPOLINE_ALIGNMENT 16
1792 /* A C statement to initialize the variable parts of a trampoline. ADDR is an
1793 RTX for the address of the trampoline; FNADDR is an RTX for the address of
1794 the nested function; STATIC_CHAIN is an RTX for the static chain value that
1795 should be passed to the function when it is called. */
1796 #define INITIALIZE_TRAMPOLINE(ADDR, FNADDR, STATIC_CHAIN) \
1797 xstormy16_initialize_trampoline (ADDR, FNADDR, STATIC_CHAIN)
1799 /* A C expression to allocate run-time space for a trampoline. The expression
1800 value should be an RTX representing a memory reference to the space for the
1803 If this macro is not defined, by default the trampoline is allocated as a
1804 stack slot. This default is right for most machines. The exceptions are
1805 machines where it is impossible to execute instructions in the stack area.
1806 On such machines, you may have to implement a separate stack, using this
1807 macro in conjunction with `TARGET_ASM_FUNCTION_PROLOGUE' and
1808 `TARGET_ASM_FUNCTION_EPILOGUE'.
1810 FP points to a data structure, a `struct function', which describes the
1811 compilation status of the immediate containing function of the function
1812 which the trampoline is for. Normally (when `ALLOCATE_TRAMPOLINE' is not
1813 defined), the stack slot for the trampoline is in the stack frame of this
1814 containing function. Other allocation strategies probably must do something
1815 analogous with this information. */
1816 /* #define ALLOCATE_TRAMPOLINE(FP) */
1818 /* Implementing trampolines is difficult on many machines because they have
1819 separate instruction and data caches. Writing into a stack location fails
1820 to clear the memory in the instruction cache, so when the program jumps to
1821 that location, it executes the old contents.
1823 Here are two possible solutions. One is to clear the relevant parts of the
1824 instruction cache whenever a trampoline is set up. The other is to make all
1825 trampolines identical, by having them jump to a standard subroutine. The
1826 former technique makes trampoline execution faster; the latter makes
1827 initialization faster.
1829 To clear the instruction cache when a trampoline is initialized, define the
1830 following macros which describe the shape of the cache. */
1832 /* The total size in bytes of the cache. */
1833 /* #define INSN_CACHE_SIZE */
1835 /* The length in bytes of each cache line. The cache is divided into cache
1836 lines which are disjoint slots, each holding a contiguous chunk of data
1837 fetched from memory. Each time data is brought into the cache, an entire
1838 line is read at once. The data loaded into a cache line is always aligned
1839 on a boundary equal to the line size. */
1840 /* #define INSN_CACHE_LINE_WIDTH */
1842 /* The number of alternative cache lines that can hold any particular memory
1844 /* #define INSN_CACHE_DEPTH */
1846 /* Alternatively, if the machine has system calls or instructions to clear the
1847 instruction cache directly, you can define the following macro. */
1849 /* If defined, expands to a C expression clearing the *instruction cache* in
1850 the specified interval. If it is not defined, and the macro INSN_CACHE_SIZE
1851 is defined, some generic code is generated to clear the cache. The
1852 definition of this macro would typically be a series of `asm' statements.
1853 Both BEG and END are both pointer expressions. */
1854 /* #define CLEAR_INSN_CACHE (BEG, END) */
1856 /* To use a standard subroutine, define the following macro. In addition, you
1857 must make sure that the instructions in a trampoline fill an entire cache
1858 line with identical instructions, or else ensure that the beginning of the
1859 trampoline code is always aligned at the same point in its cache line. Look
1860 in `m68k.h' as a guide. */
1862 /* Define this macro if trampolines need a special subroutine to do their work.
1863 The macro should expand to a series of `asm' statements which will be
1864 compiled with GNU CC. They go in a library function named
1865 `__transfer_from_trampoline'.
1867 If you need to avoid executing the ordinary prologue code of a compiled C
1868 function when you jump to the subroutine, you can do so by placing a special
1869 label of your own in the assembler code. Use one `asm' statement to
1870 generate an assembler label, and another to make the label global. Then
1871 trampolines can use that label to jump directly to your special assembler
1873 /* #define TRANSFER_FROM_TRAMPOLINE */
1876 /* Implicit Calls to Library Routines */
1878 /* A C string constant giving the name of the function to call for
1879 multiplication of one signed full-word by another. If you do not define
1880 this macro, the default name is used, which is `__mulsi3', a function
1881 defined in `libgcc.a'. */
1882 /* #define MULSI3_LIBCALL */
1884 /* A C string constant giving the name of the function to call for division of
1885 one signed full-word by another. If you do not define this macro, the
1886 default name is used, which is `__divsi3', a function defined in `libgcc.a'. */
1887 /* #define DIVSI3_LIBCALL */
1889 /* A C string constant giving the name of the function to call for division of
1890 one unsigned full-word by another. If you do not define this macro, the
1891 default name is used, which is `__udivsi3', a function defined in
1893 /* #define UDIVSI3_LIBCALL */
1895 /* A C string constant giving the name of the function to call for the
1896 remainder in division of one signed full-word by another. If you do not
1897 define this macro, the default name is used, which is `__modsi3', a function
1898 defined in `libgcc.a'. */
1899 /* #define MODSI3_LIBCALL */
1901 /* A C string constant giving the name of the function to call for the
1902 remainder in division of one unsigned full-word by another. If you do not
1903 define this macro, the default name is used, which is `__umodsi3', a
1904 function defined in `libgcc.a'. */
1905 /* #define UMODSI3_LIBCALL */
1907 /* A C string constant giving the name of the function to call for
1908 multiplication of one signed double-word by another. If you do not define
1909 this macro, the default name is used, which is `__muldi3', a function
1910 defined in `libgcc.a'. */
1911 /* #define MULDI3_LIBCALL */
1913 /* A C string constant giving the name of the function to call for division of
1914 one signed double-word by another. If you do not define this macro, the
1915 default name is used, which is `__divdi3', a function defined in `libgcc.a'. */
1916 /* #define DIVDI3_LIBCALL */
1918 /* A C string constant giving the name of the function to call for division of
1919 one unsigned full-word by another. If you do not define this macro, the
1920 default name is used, which is `__udivdi3', a function defined in
1922 /* #define UDIVDI3_LIBCALL */
1924 /* A C string constant giving the name of the function to call for the
1925 remainder in division of one signed double-word by another. If you do not
1926 define this macro, the default name is used, which is `__moddi3', a function
1927 defined in `libgcc.a'. */
1928 /* #define MODDI3_LIBCALL */
1930 /* A C string constant giving the name of the function to call for the
1931 remainder in division of one unsigned full-word by another. If you do not
1932 define this macro, the default name is used, which is `__umoddi3', a
1933 function defined in `libgcc.a'. */
1934 /* #define UMODDI3_LIBCALL */
1936 /* Define this macro as a C statement that declares additional library routines
1937 renames existing ones. `init_optabs' calls this macro after initializing all
1938 the normal library routines. */
1939 /* #define INIT_TARGET_OPTABS */
1941 /* The value of `EDOM' on the target machine, as a C integer constant
1942 expression. If you don't define this macro, GNU CC does not attempt to
1943 deposit the value of `EDOM' into `errno' directly. Look in
1944 `/usr/include/errno.h' to find the value of `EDOM' on your system.
1946 If you do not define `TARGET_EDOM', then compiled code reports domain errors
1947 by calling the library function and letting it report the error. If
1948 mathematical functions on your system use `matherr' when there is an error,
1949 then you should leave `TARGET_EDOM' undefined so that `matherr' is used
1951 /* #define TARGET_EDOM */
1953 /* Define this macro as a C expression to create an rtl expression that refers
1954 to the global "variable" `errno'. (On certain systems, `errno' may not
1955 actually be a variable.) If you don't define this macro, a reasonable
1957 /* #define GEN_ERRNO_RTX */
1959 /* Define this macro if GNU CC should generate calls to the System V (and ANSI
1960 C) library functions `memcpy' and `memset' rather than the BSD functions
1961 `bcopy' and `bzero'.
1963 Defined in svr4.h. */
1964 #define TARGET_MEM_FUNCTIONS
1966 /* Define this macro if only `float' arguments cannot be passed to library
1967 routines (so they must be converted to `double'). This macro affects both
1968 how library calls are generated and how the library routines in `libgcc1.c'
1969 accept their arguments. It is useful on machines where floating and fixed
1970 point arguments are passed differently, such as the i860. */
1971 /* #define LIBGCC_NEEDS_DOUBLE */
1973 /* Define this macro to override the type used by the library routines to pick
1974 up arguments of type `float'. (By default, they use a union of `float' and
1977 The obvious choice would be `float'--but that won't work with traditional C
1978 compilers that expect all arguments declared as `float' to arrive as
1979 `double'. To avoid this conversion, the library routines ask for the value
1980 as some other type and then treat it as a `float'.
1982 On some systems, no other type will work for this. For these systems, you
1983 must use `LIBGCC_NEEDS_DOUBLE' instead, to force conversion of the values
1984 `double' before they are passed. */
1985 /* #define FLOAT_ARG_TYPE */
1987 /* Define this macro to override the way library routines redesignate a `float'
1988 argument as a `float' instead of the type it was passed as. The default is
1989 an expression which takes the `float' field of the union. */
1990 /* #define FLOATIFY(PASSED_VALUE) */
1992 /* Define this macro to override the type used by the library routines to
1993 return values that ought to have type `float'. (By default, they use
1996 The obvious choice would be `float'--but that won't work with traditional C
1997 compilers gratuitously convert values declared as `float' into `double'. */
1998 /* #define FLOAT_VALUE_TYPE */
2000 /* Define this macro to override the way the value of a `float'-returning
2001 library routine should be packaged in order to return it. These functions
2002 are actually declared to return type `FLOAT_VALUE_TYPE' (normally `int').
2004 These values can't be returned as type `float' because traditional C
2005 compilers would gratuitously convert the value to a `double'.
2007 A local variable named `intify' is always available when the macro `INTIFY'
2008 is used. It is a union of a `float' field named `f' and a field named `i'
2009 whose type is `FLOAT_VALUE_TYPE' or `int'.
2011 If you don't define this macro, the default definition works by copying the
2012 value through that union. */
2013 /* #define INTIFY(FLOAT_VALUE) */
2015 /* Define this macro as the name of the data type corresponding to `SImode' in
2016 the system's own C compiler.
2018 You need not define this macro if that type is `long int', as it usually is. */
2019 /* #define nongcc_SI_type */
2021 /* Define this macro as the name of the data type corresponding to the
2022 word_mode in the system's own C compiler.
2024 You need not define this macro if that type is `long int', as it usually is. */
2025 /* #define nongcc_word_type */
2027 /* Define these macros to supply explicit C statements to carry out various
2028 arithmetic operations on types `float' and `double' in the library routines
2029 in `libgcc1.c'. See that file for a full list of these macros and their
2032 On most machines, you don't need to define any of these macros, because the
2033 C compiler that comes with the system takes care of doing them. */
2034 /* #define perform_... */
2036 /* Define this macro to generate code for Objective C message sending using the
2037 calling convention of the NeXT system. This calling convention involves
2038 passing the object, the selector and the method arguments all at once to the
2039 method-lookup library function.
2041 The default calling convention passes just the object and the selector to
2042 the lookup function, which returns a pointer to the method. */
2043 /* #define NEXT_OBJC_RUNTIME */
2046 /* Addressing Modes */
2048 /* Define this macro if the machine supports post-increment addressing. */
2049 #define HAVE_POST_INCREMENT 1
2051 /* Similar for other kinds of addressing. */
2052 /* #define HAVE_PRE_INCREMENT 1 */
2053 /* #define HAVE_POST_DECREMENT 1 */
2054 #define HAVE_PRE_DECREMENT 1
2056 /* A C expression that is 1 if the RTX X is a constant which is a valid
2057 address. On most machines, this can be defined as `CONSTANT_P (X)', but a
2058 few machines are more restrictive in which constant addresses are supported.
2060 `CONSTANT_P' accepts integer-values expressions whose values are not
2061 explicitly known, such as `symbol_ref', `label_ref', and `high' expressions
2062 and `const' arithmetic expressions, in addition to `const_int' and
2063 `const_double' expressions. */
2064 #define CONSTANT_ADDRESS_P(X) CONSTANT_P (X)
2066 /* A number, the maximum number of registers that can appear in a valid memory
2067 address. Note that it is up to you to specify a value equal to the maximum
2068 number that `GO_IF_LEGITIMATE_ADDRESS' would ever accept. */
2069 #define MAX_REGS_PER_ADDRESS 1
2071 /* A C compound statement with a conditional `goto LABEL;' executed if X (an
2072 RTX) is a legitimate memory address on the target machine for a memory
2073 operand of mode MODE.
2075 It usually pays to define several simpler macros to serve as subroutines for
2076 this one. Otherwise it may be too complicated to understand.
2078 This macro must exist in two variants: a strict variant and a non-strict
2079 one. The strict variant is used in the reload pass. It must be defined so
2080 that any pseudo-register that has not been allocated a hard register is
2081 considered a memory reference. In contexts where some kind of register is
2082 required, a pseudo-register with no hard register must be rejected.
2084 The non-strict variant is used in other passes. It must be defined to
2085 accept all pseudo-registers in every context where some kind of register is
2088 Compiler source files that want to use the strict variant of this macro
2089 define the macro `REG_OK_STRICT'. You should use an `#ifdef REG_OK_STRICT'
2090 conditional to define the strict variant in that case and the non-strict
2093 Subroutines to check for acceptable registers for various purposes (one for
2094 base registers, one for index registers, and so on) are typically among the
2095 subroutines used to define `GO_IF_LEGITIMATE_ADDRESS'. Then only these
2096 subroutine macros need have two variants; the higher levels of macros may be
2097 the same whether strict or not.
2099 Normally, constant addresses which are the sum of a `symbol_ref' and an
2100 integer are stored inside a `const' RTX to mark them as constant.
2101 Therefore, there is no need to recognize such sums specifically as
2102 legitimate addresses. Normally you would simply recognize any `const' as
2105 Usually `PRINT_OPERAND_ADDRESS' is not prepared to handle constant sums that
2106 are not marked with `const'. It assumes that a naked `plus' indicates
2107 indexing. If so, then you *must* reject such naked constant sums as
2108 illegitimate addresses, so that none of them will be given to
2109 `PRINT_OPERAND_ADDRESS'.
2111 On some machines, whether a symbolic address is legitimate depends on the
2112 section that the address refers to. On these machines, define the macro
2113 `ENCODE_SECTION_INFO' to store the information into the `symbol_ref', and
2114 then check for it here. When you see a `const', you will have to look
2115 inside it to find the `symbol_ref' in order to determine the section.
2117 The best way to modify the name string is by adding text to the beginning,
2118 with suitable punctuation to prevent any ambiguity. Allocate the new name
2119 in `saveable_obstack'. You will have to modify `ASM_OUTPUT_LABELREF' to
2120 remove and decode the added text and output the name accordingly, and define
2121 `STRIP_NAME_ENCODING' to access the original name string.
2123 You can check the information stored here into the `symbol_ref' in the
2124 definitions of the macros `GO_IF_LEGITIMATE_ADDRESS' and
2125 `PRINT_OPERAND_ADDRESS'. */
2126 #ifdef REG_OK_STRICT
2127 #define GO_IF_LEGITIMATE_ADDRESS(MODE, X, LABEL) \
2129 if (xstormy16_legitimate_address_p (MODE, X, 1)) \
2133 #define GO_IF_LEGITIMATE_ADDRESS(MODE, X, LABEL) \
2135 if (xstormy16_legitimate_address_p (MODE, X, 0)) \
2139 /* A C expression that is nonzero if X (assumed to be a `reg' RTX) is valid for
2140 use as a base register. For hard registers, it should always accept those
2141 which the hardware permits and reject the others. Whether the macro accepts
2142 or rejects pseudo registers must be controlled by `REG_OK_STRICT' as
2143 described above. This usually requires two variant definitions, of which
2144 `REG_OK_STRICT' controls the one actually used. */
2145 #ifdef REG_OK_STRICT
2146 #define REG_OK_FOR_BASE_P(X) \
2147 (REGNO_OK_FOR_BASE_P (REGNO (X)) && (REGNO (X) < FIRST_PSEUDO_REGISTER))
2149 #define REG_OK_FOR_BASE_P(X) REGNO_OK_FOR_BASE_P (REGNO (X))
2152 /* A C expression that is nonzero if X (assumed to be a `reg' RTX) is valid for
2153 use as an index register.
2155 The difference between an index register and a base register is that the
2156 index register may be scaled. If an address involves the sum of two
2157 registers, neither one of them scaled, then either one may be labeled the
2158 "base" and the other the "index"; but whichever labeling is used must fit
2159 the machine's constraints of which registers may serve in each capacity.
2160 The compiler will try both labelings, looking for one that is valid, and
2161 will reload one or both registers only if neither labeling works. */
2162 #define REG_OK_FOR_INDEX_P(X) REG_OK_FOR_BASE_P (X)
2164 /* A C compound statement that attempts to replace X with a valid memory
2165 address for an operand of mode MODE. WIN will be a C statement label
2166 elsewhere in the code; the macro definition may use
2168 GO_IF_LEGITIMATE_ADDRESS (MODE, X, WIN);
2170 to avoid further processing if the address has become legitimate.
2172 X will always be the result of a call to `break_out_memory_refs', and OLDX
2173 will be the operand that was given to that function to produce X.
2175 The code generated by this macro should not alter the substructure of X. If
2176 it transforms X into a more legitimate form, it should assign X (which will
2177 always be a C variable) a new value.
2179 It is not necessary for this macro to come up with a legitimate address.
2180 The compiler has standard ways of doing so in all cases. In fact, it is
2181 safe for this macro to do nothing. But often a machine-dependent strategy
2182 can generate better code. */
2183 #define LEGITIMIZE_ADDRESS(X, OLDX, MODE, WIN)
2185 /* A C statement or compound statement with a conditional `goto LABEL;'
2186 executed if memory address X (an RTX) can have different meanings depending
2187 on the machine mode of the memory reference it is used for or if the address
2188 is valid for some modes but not others.
2190 Autoincrement and autodecrement addresses typically have mode-dependent
2191 effects because the amount of the increment or decrement is the size of the
2192 operand being addressed. Some machines have other mode-dependent addresses.
2193 Many RISC machines have no mode-dependent addresses.
2195 You may assume that ADDR is a valid address for the machine.
2197 On this chip, this is true if the address is valid with an offset
2198 of 0 but not of 6, because in that case it cannot be used as an
2199 address for DImode or DFmode, or if the address is a post-increment
2200 or pre-decrement address.
2202 #define GO_IF_MODE_DEPENDENT_ADDRESS(ADDR,LABEL) \
2203 if (xstormy16_mode_dependent_address_p (ADDR)) \
2206 /* A C expression that is nonzero if X is a legitimate constant for an
2207 immediate operand on the target machine. You can assume that X satisfies
2208 `CONSTANT_P', so you need not check this. In fact, `1' is a suitable
2209 definition for this macro on machines where anything `CONSTANT_P' is valid. */
2210 #define LEGITIMATE_CONSTANT_P(X) 1
2213 /* Condition Code Status */
2215 /* C code for a data type which is used for declaring the `mdep' component of
2216 `cc_status'. It defaults to `int'.
2218 This macro is not used on machines that do not use `cc0'. */
2219 /* #define CC_STATUS_MDEP */
2221 /* A C expression to initialize the `mdep' field to "empty". The default
2222 definition does nothing, since most machines don't use the field anyway. If
2223 you want to use the field, you should probably define this macro to
2226 This macro is not used on machines that do not use `cc0'. */
2227 /* #define CC_STATUS_MDEP_INIT */
2229 /* A C compound statement to set the components of `cc_status' appropriately
2230 for an insn INSN whose body is EXP. It is this macro's responsibility to
2231 recognize insns that set the condition code as a byproduct of other activity
2232 as well as those that explicitly set `(cc0)'.
2234 This macro is not used on machines that do not use `cc0'.
2236 If there are insns that do not set the condition code but do alter other
2237 machine registers, this macro must check to see whether they invalidate the
2238 expressions that the condition code is recorded as reflecting. For example,
2239 on the 68000, insns that store in address registers do not set the condition
2240 code, which means that usually `NOTICE_UPDATE_CC' can leave `cc_status'
2241 unaltered for such insns. But suppose that the previous insn set the
2242 condition code based on location `a4@(102)' and the current insn stores a
2243 new value in `a4'. Although the condition code is not changed by this, it
2244 will no longer be true that it reflects the contents of `a4@(102)'.
2245 Therefore, `NOTICE_UPDATE_CC' must alter `cc_status' in this case to say
2246 that nothing is known about the condition code value.
2248 The definition of `NOTICE_UPDATE_CC' must be prepared to deal with the
2249 results of peephole optimization: insns whose patterns are `parallel' RTXs
2250 containing various `reg', `mem' or constants which are just the operands.
2251 The RTL structure of these insns is not sufficient to indicate what the
2252 insns actually do. What `NOTICE_UPDATE_CC' should do when it sees one is
2253 just to run `CC_STATUS_INIT'.
2255 A possible definition of `NOTICE_UPDATE_CC' is to call a function that looks
2256 at an attribute named, for example, `cc'. This avoids having detailed
2257 information about patterns in two places, the `md' file and in
2258 `NOTICE_UPDATE_CC'. */
2259 /* #define NOTICE_UPDATE_CC(EXP, INSN) */
2261 /* A list of names to be used for additional modes for condition code values in
2262 registers. These names are added to `enum machine_mode' and all have class
2263 `MODE_CC'. By convention, they should start with `CC' and end with `mode'.
2265 You should only define this macro if your machine does not use `cc0' and
2266 only if additional modes are required. */
2267 /* #define EXTRA_CC_MODES */
2269 /* Returns a mode from class `MODE_CC' to be used when comparison operation
2270 code OP is applied to rtx X and Y. For example, on the Sparc,
2271 `SELECT_CC_MODE' is defined as (see *note Jump Patterns::. for a
2272 description of the reason for this definition)
2274 #define SELECT_CC_MODE(OP,X,Y) \
2275 (GET_MODE_CLASS (GET_MODE (X)) == MODE_FLOAT \
2276 ? ((OP == EQ || OP == NE) ? CCFPmode : CCFPEmode) \
2277 : ((GET_CODE (X) == PLUS || GET_CODE (X) == MINUS \
2278 || GET_CODE (X) == NEG) \
2279 ? CC_NOOVmode : CCmode))
2281 You need not define this macro if `EXTRA_CC_MODES' is not defined. */
2282 /* #define SELECT_CC_MODE(OP, X, Y) */
2284 /* One some machines not all possible comparisons are defined, but you can
2285 convert an invalid comparison into a valid one. For example, the Alpha does
2286 not have a `GT' comparison, but you can use an `LT' comparison instead and
2287 swap the order of the operands.
2289 On such machines, define this macro to be a C statement to do any required
2290 conversions. CODE is the initial comparison code and OP0 and OP1 are the
2291 left and right operands of the comparison, respectively. You should modify
2292 CODE, OP0, and OP1 as required.
2294 GNU CC will not assume that the comparison resulting from this macro is
2295 valid but will see if the resulting insn matches a pattern in the `md' file.
2297 You need not define this macro if it would never change the comparison code
2299 /* #define CANONICALIZE_COMPARISON(CODE, OP0, OP1) */
2301 /* A C expression whose value is one if it is always safe to reverse a
2302 comparison whose mode is MODE. If `SELECT_CC_MODE' can ever return MODE for
2303 a floating-point inequality comparison, then `REVERSIBLE_CC_MODE (MODE)'
2306 You need not define this macro if it would always returns zero or if the
2307 floating-point format is anything other than `IEEE_FLOAT_FORMAT'. For
2308 example, here is the definition used on the Sparc, where floating-point
2309 inequality comparisons are always given `CCFPEmode':
2311 #define REVERSIBLE_CC_MODE(MODE) ((MODE) != CCFPEmode) */
2312 /* #define REVERSIBLE_CC_MODE(MODE) */
2315 /* Describing Relative Costs of Operations */
2317 /* A part of a C `switch' statement that describes the relative costs of
2318 constant RTL expressions. It must contain `case' labels for expression
2319 codes `const_int', `const', `symbol_ref', `label_ref' and `const_double'.
2320 Each case must ultimately reach a `return' statement to return the relative
2321 cost of the use of that kind of constant value in an expression. The cost
2322 may depend on the precise value of the constant, which is available for
2323 examination in X, and the rtx code of the expression in which it is
2324 contained, found in OUTER_CODE.
2326 CODE is the expression code--redundant, since it can be obtained with
2328 #define CONST_COSTS(X, CODE, OUTER_CODE) \
2330 if (INTVAL (X) < 16 && INTVAL (X) >= 0) \
2331 return COSTS_N_INSNS (1)/2; \
2332 if (INTVAL (X) < 256 && INTVAL (X) >= 0) \
2333 return COSTS_N_INSNS (1); \
2334 case CONST_DOUBLE: \
2338 return COSTS_N_INSNS(2);
2340 /* Like `CONST_COSTS' but applies to nonconstant RTL expressions. This can be
2341 used, for example, to indicate how costly a multiply instruction is. In
2342 writing this macro, you can use the construct `COSTS_N_INSNS (N)' to specify
2343 a cost equal to N fast instructions. OUTER_CODE is the code of the
2344 expression in which X is contained.
2346 This macro is optional; do not define it if the default cost assumptions are
2347 adequate for the target machine. */
2348 #define RTX_COSTS(X, CODE, OUTER_CODE) \
2350 return COSTS_N_INSNS (35 + 6); \
2352 return COSTS_N_INSNS (51 - 6);
2354 /* An expression giving the cost of an addressing mode that contains ADDRESS.
2355 If not defined, the cost is computed from the ADDRESS expression and the
2356 `CONST_COSTS' values.
2358 For most CISC machines, the default cost is a good approximation of the true
2359 cost of the addressing mode. However, on RISC machines, all instructions
2360 normally have the same length and execution time. Hence all addresses will
2363 In cases where more than one form of an address is known, the form with the
2364 lowest cost will be used. If multiple forms have the same, lowest, cost,
2365 the one that is the most complex will be used.
2367 For example, suppose an address that is equal to the sum of a register and a
2368 constant is used twice in the same basic block. When this macro is not
2369 defined, the address will be computed in a register and memory references
2370 will be indirect through that register. On machines where the cost of the
2371 addressing mode containing the sum is no higher than that of a simple
2372 indirect reference, this will produce an additional instruction and possibly
2373 require an additional register. Proper specification of this macro
2374 eliminates this overhead for such machines.
2376 Similar use of this macro is made in strength reduction of loops.
2378 ADDRESS need not be valid as an address. In such a case, the cost is not
2379 relevant and can be any value; invalid addresses need not be assigned a
2382 On machines where an address involving more than one register is as cheap as
2383 an address computation involving only one register, defining `ADDRESS_COST'
2384 to reflect this can cause two registers to be live over a region of code
2385 where only one would have been if `ADDRESS_COST' were not defined in that
2386 manner. This effect should be considered in the definition of this macro.
2387 Equivalent costs should probably only be given to addresses with different
2388 numbers of registers on machines with lots of registers.
2390 This macro will normally either not be defined or be defined as a
2392 #define ADDRESS_COST(ADDRESS) \
2393 (GET_CODE (ADDRESS) == CONST_INT ? 2 \
2394 : GET_CODE (ADDRESS) == PLUS ? 7 \
2397 /* A C expression for the cost of moving data of mode MODE from a
2398 register in class FROM to one in class TO. The classes are
2399 expressed using the enumeration values such as `GENERAL_REGS'. A
2400 value of 4 is the default; other values are interpreted relative to
2403 It is not required that the cost always equal 2 when FROM is the same as TO;
2404 on some machines it is expensive to move between registers if they are not
2407 If reload sees an insn consisting of a single `set' between two hard
2408 registers, and if `REGISTER_MOVE_COST' applied to their classes returns a
2409 value of 2, reload does not check to ensure that the constraints of the insn
2410 are met. Setting a cost of other than 2 will allow reload to verify that
2411 the constraints are met. You should do this if the `movM' pattern's
2412 constraints do not allow such copying. */
2413 #define REGISTER_MOVE_COST(MODE, FROM, TO) 2
2415 /* A C expression for the cost of moving data of mode M between a register and
2416 memory. A value of 2 is the default; this cost is relative to those in
2417 `REGISTER_MOVE_COST'.
2419 If moving between registers and memory is more expensive than between two
2420 registers, you should define this macro to express the relative cost. */
2421 #define MEMORY_MOVE_COST(M,C,I) (5 + memory_move_secondary_cost (M, C, I))
2423 /* A C expression for the cost of a branch instruction. A value of 1 is the
2424 default; other values are interpreted relative to that. */
2426 #define BRANCH_COST 5
2428 /* Here are additional macros which do not specify precise relative costs, but
2429 only that certain actions are more expensive than GNU CC would ordinarily
2432 /* Define this macro as a C expression which is nonzero if accessing less than
2433 a word of memory (i.e. a `char' or a `short') is no faster than accessing a
2434 word of memory, i.e., if such access require more than one instruction or if
2435 there is no difference in cost between byte and (aligned) word loads.
2437 When this macro is not defined, the compiler will access a field by finding
2438 the smallest containing object; when it is defined, a fullword load will be
2439 used if alignment permits. Unless bytes accesses are faster than word
2440 accesses, using word accesses is preferable since it may eliminate
2441 subsequent memory access if subsequent accesses occur to other fields in the
2442 same word of the structure, but to different bytes. */
2443 #define SLOW_BYTE_ACCESS 0
2445 /* Define this macro to be the value 1 if unaligned accesses have a cost many
2446 times greater than aligned accesses, for example if they are emulated in a
2449 When this macro is non-zero, the compiler will act as if `STRICT_ALIGNMENT'
2450 were non-zero when generating code for block moves. This can cause
2451 significantly more instructions to be produced. Therefore, do not set this
2452 macro non-zero if unaligned accesses only add a cycle or two to the time for
2455 If the value of this macro is always zero, it need not be defined. */
2456 /* #define SLOW_UNALIGNED_ACCESS */
2458 /* Define this macro to inhibit strength reduction of memory addresses. (On
2459 some machines, such strength reduction seems to do harm rather than good.) */
2460 /* #define DONT_REDUCE_ADDR */
2462 /* The number of scalar move insns which should be generated instead of a
2463 string move insn or a library call. Increasing the value will always make
2464 code faster, but eventually incurs high cost in increased code size.
2466 If you don't define this, a reasonable default is used. */
2467 /* #define MOVE_RATIO */
2469 /* Define this macro if it is as good or better to call a constant function
2470 address than to call an address kept in a register. */
2471 #define NO_FUNCTION_CSE
2473 /* Define this macro if it is as good or better for a function to call itself
2474 with an explicit address than to call an address kept in a register. */
2475 #define NO_RECURSIVE_FUNCTION_CSE
2477 /* A C statement (sans semicolon) to update the integer variable COST based on
2478 the relationship between INSN that is dependent on DEP_INSN through the
2479 dependence LINK. The default is to make no adjustment to COST. This can be
2480 used for example to specify to the scheduler that an output- or
2481 anti-dependence does not incur the same cost as a data-dependence. */
2482 /* #define ADJUST_COST(INSN, LINK, DEP_INSN, COST) */
2484 /* A C statement (sans semicolon) to update the integer scheduling
2485 priority `INSN_PRIORITY(INSN)'. Reduce the priority to execute
2486 the INSN earlier, increase the priority to execute INSN later.
2487 Do not define this macro if you do not need to adjust the
2488 scheduling priorities of insns. */
2489 /* #define ADJUST_PRIORITY (INSN) */
2492 /* Dividing the output into sections. */
2494 /* A C expression whose value is a string containing the assembler operation
2495 that should precede instructions and read-only data. Normally `".text"' is
2497 #define TEXT_SECTION_ASM_OP ".text"
2499 /* A C expression whose value is a string containing the assembler operation to
2500 identify the following data as writable initialized data. Normally
2501 `".data"' is right. */
2502 #define DATA_SECTION_ASM_OP ".data"
2504 /* if defined, a C expression whose value is a string containing the assembler
2505 operation to identify the following data as shared data. If not defined,
2506 `DATA_SECTION_ASM_OP' will be used. */
2507 /* #define SHARED_SECTION_ASM_OP */
2509 /* If defined, a C expression whose value is a string containing the
2510 assembler operation to identify the following data as
2511 uninitialized global data. If not defined, and neither
2512 `ASM_OUTPUT_BSS' nor `ASM_OUTPUT_ALIGNED_BSS' are defined,
2513 uninitialized global data will be output in the data section if
2514 `-fno-common' is passed, otherwise `ASM_OUTPUT_COMMON' will be
2516 #define BSS_SECTION_ASM_OP ".bss"
2518 /* If defined, a C expression whose value is a string containing the
2519 assembler operation to identify the following data as
2520 uninitialized global shared data. If not defined, and
2521 `BSS_SECTION_ASM_OP' is, the latter will be used. */
2522 /* #define SHARED_BSS_SECTION_ASM_OP */
2524 /* Define the pseudo-ops used to switch to the .ctors and .dtors sections.
2525 There are no shared libraries on this target so these sections need
2528 Defined in elfos.h. */
2530 #undef CTORS_SECTION_ASM_OP
2531 #undef DTORS_SECTION_ASM_OP
2532 #define CTORS_SECTION_ASM_OP "\t.section\t.ctors,\"a\""
2533 #define DTORS_SECTION_ASM_OP "\t.section\t.dtors,\"a\""
2535 /* A list of names for sections other than the standard two, which are
2536 `in_text' and `in_data'. You need not define this macro on a system with no
2537 other sections (that GCC needs to use).
2539 Defined in svr4.h. */
2540 /* #define EXTRA_SECTIONS */
2542 /* One or more functions to be defined in `varasm.c'. These functions should
2543 do jobs analogous to those of `text_section' and `data_section', for your
2544 additional sections. Do not define this macro if you do not define
2547 Defined in svr4.h. */
2548 /* #define EXTRA_SECTION_FUNCTIONS */
2550 /* On most machines, read-only variables, constants, and jump tables are placed
2551 in the text section. If this is not the case on your machine, this macro
2552 should be defined to be the name of a function (either `data_section' or a
2553 function defined in `EXTRA_SECTIONS') that switches to the section to be
2554 used for read-only items.
2556 If these items should be placed in the text section, this macro should not
2558 /* #define READONLY_DATA_SECTION */
2560 /* A C statement or statements to switch to the appropriate section for output
2561 of EXP. You can assume that EXP is either a `VAR_DECL' node or a constant
2562 of some sort. RELOC indicates whether the initial value of EXP requires
2563 link-time relocations. Select the section by calling `text_section' or one
2564 of the alternatives for other sections.
2566 Do not define this macro if you put all read-only variables and constants in
2567 the read-only data section (usually the text section).
2569 Defined in svr4.h. */
2570 /* #define SELECT_SECTION(EXP, RELOC, ALIGN) */
2572 /* A C statement or statements to switch to the appropriate section for output
2573 of RTX in mode MODE. You can assume that RTX is some kind of constant in
2574 RTL. The argument MODE is redundant except in the case of a `const_int'
2575 rtx. Select the section by calling `text_section' or one of the
2576 alternatives for other sections.
2578 Do not define this macro if you put all constants in the read-only data
2581 Defined in svr4.h. */
2582 /* #define SELECT_RTX_SECTION(MODE, RTX, ALIGN) */
2584 /* Define this macro if jump tables (for `tablejump' insns) should be output in
2585 the text section, along with the assembler instructions. Otherwise, the
2586 readonly data section is used.
2588 This macro is irrelevant if there is no separate readonly data section. */
2589 #define JUMP_TABLES_IN_TEXT_SECTION 1
2591 /* Define this macro if references to a symbol must be treated differently
2592 depending on something about the variable or function named by the symbol
2593 (such as what section it is in).
2595 The macro definition, if any, is executed immediately after the rtl for DECL
2596 has been created and stored in `DECL_RTL (DECL)'. The value of the rtl will
2597 be a `mem' whose address is a `symbol_ref'.
2599 The usual thing for this macro to do is to record a flag in the `symbol_ref'
2600 (such as `SYMBOL_REF_FLAG') or to store a modified name string in the
2601 `symbol_ref' (if one bit is not enough information). */
2602 #define ENCODE_SECTION_INFO(DECL) xstormy16_encode_section_info(DECL)
2604 /* Decode SYM_NAME and store the real name part in VAR, sans the characters
2605 that encode section info. Define this macro if `ENCODE_SECTION_INFO' alters
2606 the symbol's name string. */
2607 /* #define STRIP_NAME_ENCODING(VAR, SYM_NAME) */
2609 /* A C statement to build up a unique section name, expressed as a
2610 STRING_CST node, and assign it to `DECL_SECTION_NAME (DECL)'.
2611 RELOC indicates whether the initial value of EXP requires
2612 link-time relocations. If you do not define this macro, GNU CC
2613 will use the symbol name prefixed by `.' as the section name.
2615 Defined in svr4.h. */
2616 /* #define UNIQUE_SECTION(DECL, RELOC) */
2619 /* Position Independent Code. */
2621 /* The register number of the register used to address a table of static data
2622 addresses in memory. In some cases this register is defined by a
2623 processor's "application binary interface" (ABI). When this macro is
2624 defined, RTL is generated for this register once, as with the stack pointer
2625 and frame pointer registers. If this macro is not defined, it is up to the
2626 machine-dependent files to allocate such a register (if necessary). */
2627 /* #define PIC_OFFSET_TABLE_REGNUM */
2629 /* Define this macro if the register defined by `PIC_OFFSET_TABLE_REGNUM' is
2630 clobbered by calls. Do not define this macro if `PPIC_OFFSET_TABLE_REGNUM'
2632 /* #define PIC_OFFSET_TABLE_REG_CALL_CLOBBERED */
2634 /* By generating position-independent code, when two different programs (A and
2635 B) share a common library (libC.a), the text of the library can be shared
2636 whether or not the library is linked at the same address for both programs.
2637 In some of these environments, position-independent code requires not only
2638 the use of different addressing modes, but also special code to enable the
2639 use of these addressing modes.
2641 The `FINALIZE_PIC' macro serves as a hook to emit these special codes once
2642 the function is being compiled into assembly code, but not before. (It is
2643 not done before, because in the case of compiling an inline function, it
2644 would lead to multiple PIC prologues being included in functions which used
2645 inline functions and were compiled to assembly language.) */
2646 /* #define FINALIZE_PIC */
2648 /* A C expression that is nonzero if X is a legitimate immediate operand on the
2649 target machine when generating position independent code. You can assume
2650 that X satisfies `CONSTANT_P', so you need not check this. You can also
2651 assume FLAG_PIC is true, so you need not check it either. You need not
2652 define this macro if all constants (including `SYMBOL_REF') can be immediate
2653 operands when generating position independent code. */
2654 /* #define LEGITIMATE_PIC_OPERAND_P(X) */
2657 /* The Overall Framework of an Assembler File. */
2659 /* A C expression which outputs to the stdio stream STREAM some appropriate
2660 text to go at the start of an assembler file.
2662 Normally this macro is defined to output a line containing `#NO_APP', which
2663 is a comment that has no effect on most assemblers but tells the GNU
2664 assembler that it can save time by not checking for certain assembler
2667 On systems that use SDB, it is necessary to output certain commands; see
2670 Defined in svr4.h. */
2671 /* #define ASM_FILE_START(STREAM) */
2673 /* A C expression which outputs to the stdio stream STREAM some appropriate
2674 text to go at the end of an assembler file.
2676 If this macro is not defined, the default is to output nothing special at
2677 the end of the file. Most systems don't require any definition.
2679 On systems that use SDB, it is necessary to output certain commands; see
2682 Defined in svr4.h. */
2683 /* #define ASM_FILE_END(STREAM) */
2685 /* A C string constant describing how to begin a comment in the target
2686 assembler language. The compiler assumes that the comment will end at the
2688 #define ASM_COMMENT_START ";"
2690 /* A C string constant for text to be output before each `asm' statement or
2691 group of consecutive ones. Normally this is `"#APP"', which is a comment
2692 that has no effect on most assemblers but tells the GNU assembler that it
2693 must check the lines that follow for all valid assembler constructs. */
2694 #define ASM_APP_ON "#APP\n"
2696 /* A C string constant for text to be output after each `asm' statement or
2697 group of consecutive ones. Normally this is `"#NO_APP"', which tells the
2698 GNU assembler to resume making the time-saving assumptions that are valid
2699 for ordinary compiler output. */
2700 #define ASM_APP_OFF "#NO_APP\n"
2702 /* A C statement to output COFF information or DWARF debugging information
2703 which indicates that filename NAME is the current source file to the stdio
2706 This macro need not be defined if the standard form of output for the file
2707 format in use is appropriate. */
2708 /* #define ASM_OUTPUT_SOURCE_FILENAME(STREAM, NAME) */
2710 /* A C statement to output DBX or SDB debugging information before code for
2711 line number LINE of the current source file to the stdio stream STREAM.
2713 This macro need not be defined if the standard form of debugging information
2714 for the debugger in use is appropriate.
2716 Defined in svr4.h. */
2717 /* #define ASM_OUTPUT_SOURCE_LINE(STREAM, LINE) */
2719 /* A C statement to output something to the assembler file to handle a `#ident'
2720 directive containing the text STRING. If this macro is not defined, nothing
2721 is output for a `#ident' directive.
2723 Defined in svr4.h. */
2724 /* #define ASM_OUTPUT_IDENT(STREAM, STRING) */
2726 /* A C statement to output something to the assembler file to switch to section
2727 NAME for object DECL which is either a `FUNCTION_DECL', a `VAR_DECL' or
2728 `NULL_TREE'. Some target formats do not support arbitrary sections. Do not
2729 define this macro in such cases.
2731 At present this macro is only used to support section attributes. When this
2732 macro is undefined, section attributes are disabled.
2734 Defined in svr4.h. */
2735 /* #define ASM_OUTPUT_SECTION_NAME(STREAM, DECL, NAME) */
2737 /* A C statement to output any assembler statements which are required to
2738 precede any Objective C object definitions or message sending. The
2739 statement is executed only when compiling an Objective C program. */
2740 /* #define OBJC_PROLOGUE */
2743 /* Output of Data. */
2745 /* A C statement to output to the stdio stream STREAM an assembler instruction
2746 to assemble a string constant containing the LEN bytes at PTR. PTR will be
2747 a C expression of type `char *' and LEN a C expression of type `int'.
2749 If the assembler has a `.ascii' pseudo-op as found in the Berkeley Unix
2750 assembler, do not define the macro `ASM_OUTPUT_ASCII'.
2752 Defined in svr4.h. */
2753 /* #define ASM_OUTPUT_ASCII(STREAM, PTR, LEN) */
2755 /* You may define this macro as a C expression. You should define the
2756 expression to have a non-zero value if GNU CC should output the
2757 constant pool for a function before the code for the function, or
2758 a zero value if GNU CC should output the constant pool after the
2759 function. If you do not define this macro, the usual case, GNU CC
2760 will output the constant pool before the function. */
2761 /* #define CONSTANT_POOL_BEFORE_FUNCTION */
2763 /* A C statement to output assembler commands to define the start of the
2764 constant pool for a function. FUNNAME is a string giving the name of the
2765 function. Should the return type of the function be required, it can be
2766 obtained via FUNDECL. SIZE is the size, in bytes, of the constant pool that
2767 will be written immediately after this call.
2769 If no constant-pool prefix is required, the usual case, this macro need not
2771 /* #define ASM_OUTPUT_POOL_PROLOGUE(FILE FUNNAME FUNDECL SIZE) */
2773 /* A C statement (with or without semicolon) to output a constant in the
2774 constant pool, if it needs special treatment. (This macro need not do
2775 anything for RTL expressions that can be output normally.)
2777 The argument FILE is the standard I/O stream to output the assembler code
2778 on. X is the RTL expression for the constant to output, and MODE is the
2779 machine mode (in case X is a `const_int'). ALIGN is the required alignment
2780 for the value X; you should output an assembler directive to force this much
2783 The argument LABELNO is a number to use in an internal label for the address
2784 of this pool entry. The definition of this macro is responsible for
2785 outputting the label definition at the proper place. Here is how to do
2788 ASM_OUTPUT_INTERNAL_LABEL (FILE, "LC", LABELNO);
2790 When you output a pool entry specially, you should end with a `goto' to the
2791 label JUMPTO. This will prevent the same pool entry from being output a
2792 second time in the usual manner.
2794 You need not define this macro if it would do nothing. */
2795 /* #define ASM_OUTPUT_SPECIAL_POOL_ENTRY(FILE, X, MODE, ALIGN, LABELNO, JUMPTO) */
2797 /* Define this macro as a C expression which is nonzero if the constant EXP, of
2798 type `tree', should be output after the code for a function. The compiler
2799 will normally output all constants before the function; you need not define
2800 this macro if this is OK. */
2801 /* #define CONSTANT_AFTER_FUNCTION_P(EXP) */
2803 /* A C statement to output assembler commands to at the end of the constant
2804 pool for a function. FUNNAME is a string giving the name of the function.
2805 Should the return type of the function be required, you can obtain it via
2806 FUNDECL. SIZE is the size, in bytes, of the constant pool that GNU CC wrote
2807 immediately before this call.
2809 If no constant-pool epilogue is required, the usual case, you need not
2810 define this macro. */
2811 /* #define ASM_OUTPUT_POOL_EPILOGUE (FILE FUNNAME FUNDECL SIZE) */
2813 /* Define this macro as a C expression which is nonzero if C is used as a
2814 logical line separator by the assembler.
2816 If you do not define this macro, the default is that only the character `;'
2817 is treated as a logical line separator. */
2818 #define IS_ASM_LOGICAL_LINE_SEPARATOR(C) ((C) == '|')
2820 /* These macros are provided by `real.h' for writing the definitions of
2821 `ASM_OUTPUT_DOUBLE' and the like: */
2823 /* These translate X, of type `REAL_VALUE_TYPE', to the target's floating point
2824 representation, and store its bit pattern in the array of `long int' whose
2825 address is L. The number of elements in the output array is determined by
2826 the size of the desired target floating point data type: 32 bits of it go in
2827 each `long int' array element. Each array element holds 32 bits of the
2828 result, even if `long int' is wider than 32 bits on the host machine.
2830 The array element values are designed so that you can print them out using
2831 `fprintf' in the order they should appear in the target machine's memory. */
2832 /* #define REAL_VALUE_TO_TARGET_SINGLE(X, L) */
2833 /* #define REAL_VALUE_TO_TARGET_DOUBLE(X, L) */
2834 /* #define REAL_VALUE_TO_TARGET_LONG_DOUBLE(X, L) */
2836 /* This macro converts X, of type `REAL_VALUE_TYPE', to a decimal number and
2837 stores it as a string into STRING. You must pass, as STRING, the address of
2838 a long enough block of space to hold the result.
2840 The argument FORMAT is a `printf'-specification that serves as a suggestion
2841 for how to format the output string. */
2842 /* #define REAL_VALUE_TO_DECIMAL(X, FORMAT, STRING) */
2845 /* Output of Uninitialized Variables. */
2847 /* A C statement (sans semicolon) to output to the stdio stream STREAM the
2848 assembler definition of a common-label named NAME whose size is SIZE bytes.
2849 The variable ROUNDED is the size rounded up to whatever alignment the caller
2852 Use the expression `assemble_name (STREAM, NAME)' to output the name itself;
2853 before and after that, output the additional assembler syntax for defining
2854 the name, and a newline.
2856 This macro controls how the assembler definitions of uninitialized global
2857 variables are output. */
2858 /* #define ASM_OUTPUT_COMMON(STREAM, NAME, SIZE, ROUNDED) */
2860 /* Like `ASM_OUTPUT_COMMON' except takes the required alignment as a separate,
2861 explicit argument. If you define this macro, it is used in place of
2862 `ASM_OUTPUT_COMMON', and gives you more flexibility in handling the required
2863 alignment of the variable. The alignment is specified as the number of
2866 Defined in svr4.h. */
2867 /* #define ASM_OUTPUT_ALIGNED_COMMON(STREAM, NAME, SIZE, ALIGNMENT) */
2869 /* Like ASM_OUTPUT_ALIGNED_COMMON except that it takes an additional argument -
2870 the DECL of the variable to be output, if there is one. This macro can be
2871 called with DECL == NULL_TREE. If you define this macro, it is used in
2872 place of both ASM_OUTPUT_COMMON and ASM_OUTPUT_ALIGNED_COMMON, and gives you
2873 more flexibility in handling the destination of the variable. */
2874 /* #define ASM_OUTPUT_DECL_COMMON (STREAM, DECL, NAME, SIZE, ALIGNMENT) */
2876 /* If defined, it is similar to `ASM_OUTPUT_COMMON', except that it is used
2877 when NAME is shared. If not defined, `ASM_OUTPUT_COMMON' will be used. */
2878 /* #define ASM_OUTPUT_SHARED_COMMON(STREAM, NAME, SIZE, ROUNDED) */
2880 /* A C statement (sans semicolon) to output to the stdio stream STREAM the
2881 assembler definition of uninitialized global DECL named NAME whose size is
2882 SIZE bytes. The variable ROUNDED is the size rounded up to whatever
2883 alignment the caller wants.
2885 Try to use function `asm_output_bss' defined in `varasm.c' when defining
2886 this macro. If unable, use the expression `assemble_name (STREAM, NAME)' to
2887 output the name itself; before and after that, output the additional
2888 assembler syntax for defining the name, and a newline.
2890 This macro controls how the assembler definitions of uninitialized global
2891 variables are output. This macro exists to properly support languages like
2892 `c++' which do not have `common' data. However, this macro currently is not
2893 defined for all targets. If this macro and `ASM_OUTPUT_ALIGNED_BSS' are not
2894 defined then `ASM_OUTPUT_COMMON' or `ASM_OUTPUT_ALIGNED_COMMON' or
2895 `ASM_OUTPUT_DECL_COMMON' is used. */
2896 /* #define ASM_OUTPUT_BSS(STREAM, DECL, NAME, SIZE, ROUNDED) */
2898 /* Like `ASM_OUTPUT_BSS' except takes the required alignment as a separate,
2899 explicit argument. If you define this macro, it is used in place of
2900 `ASM_OUTPUT_BSS', and gives you more flexibility in handling the required
2901 alignment of the variable. The alignment is specified as the number of
2904 Try to use function `asm_output_aligned_bss' defined in file `varasm.c' when
2905 defining this macro. */
2906 /* #define ASM_OUTPUT_ALIGNED_BSS(STREAM, DECL, NAME, SIZE, ALIGNMENT) */
2908 /* If defined, it is similar to `ASM_OUTPUT_BSS', except that it is used when
2909 NAME is shared. If not defined, `ASM_OUTPUT_BSS' will be used. */
2910 /* #define ASM_OUTPUT_SHARED_BSS(STREAM, DECL, NAME, SIZE, ROUNDED) */
2912 /* A C statement (sans semicolon) to output to the stdio stream STREAM the
2913 assembler definition of a local-common-label named NAME whose size is SIZE
2914 bytes. The variable ROUNDED is the size rounded up to whatever alignment
2917 Use the expression `assemble_name (STREAM, NAME)' to output the name itself;
2918 before and after that, output the additional assembler syntax for defining
2919 the name, and a newline.
2921 This macro controls how the assembler definitions of uninitialized static
2922 variables are output. */
2923 /* #define ASM_OUTPUT_LOCAL(STREAM, NAME, SIZE, ROUNDED) */
2925 /* Like `ASM_OUTPUT_LOCAL' except takes the required alignment as a separate,
2926 explicit argument. If you define this macro, it is used in place of
2927 `ASM_OUTPUT_LOCAL', and gives you more flexibility in handling the required
2928 alignment of the variable. The alignment is specified as the number of
2931 Defined in svr4.h. */
2932 /* #define ASM_OUTPUT_ALIGNED_LOCAL(STREAM, NAME, SIZE, ALIGNMENT) */
2934 /* Like `ASM_OUTPUT_ALIGNED_LOCAL' except that it takes an additional
2935 parameter - the DECL of variable to be output, if there is one.
2936 This macro can be called with DECL == NULL_TREE. If you define
2937 this macro, it is used in place of `ASM_OUTPUT_LOCAL' and
2938 `ASM_OUTPUT_ALIGNED_LOCAL', and gives you more flexibility in
2939 handling the destination of the variable. */
2940 /* #define ASM_OUTPUT_DECL_LOCAL(STREAM, DECL, NAME, SIZE, ALIGNMENT) */
2942 /* If defined, it is similar to `ASM_OUTPUT_LOCAL', except that it is used when
2943 NAME is shared. If not defined, `ASM_OUTPUT_LOCAL' will be used. */
2944 /* #define ASM_OUTPUT_SHARED_LOCAL (STREAM, NAME, SIZE, ROUNDED) */
2947 /* Output and Generation of Labels. */
2949 /* A C statement (sans semicolon) to output to the stdio stream STREAM the
2950 assembler definition of a label named NAME. Use the expression
2951 `assemble_name (STREAM, NAME)' to output the name itself; before and after
2952 that, output the additional assembler syntax for defining the name, and a
2954 #define ASM_OUTPUT_LABEL(STREAM, NAME) \
2956 assemble_name (STREAM, NAME); \
2957 fputs (":\n", STREAM); \
2960 /* A C statement to output to the stdio stream STREAM the assembler
2961 definition of a symbol named SYMBOL. */
2962 #define ASM_OUTPUT_SYMBOL_REF(STREAM, SYMBOL) \
2964 if (SYMBOL_REF_FLAG (SYMBOL)) \
2966 fputs ("@fptr(", STREAM); \
2967 assemble_name (STREAM, XSTR (SYMBOL, 0)); \
2968 fputc (')', STREAM); \
2971 assemble_name (STREAM, XSTR (SYMBOL, 0)); \
2974 /* A C statement to output to the stdio stream STREAM the assembler
2975 definition of a label, the textual form is in 'BUF'. Not used
2977 #define ASM_OUTPUT_LABEL_REF(STREAM, NAME) \
2979 fputs ("@fptr(", STREAM); \
2980 assemble_name (STREAM, NAME); \
2981 fputc (')', STREAM); \
2984 /* A C statement (sans semicolon) to output to the stdio stream STREAM any text
2985 necessary for declaring the name NAME of a function which is being defined.
2986 This macro is responsible for outputting the label definition (perhaps using
2987 `ASM_OUTPUT_LABEL'). The argument DECL is the `FUNCTION_DECL' tree node
2988 representing the function.
2990 If this macro is not defined, then the function name is defined in the usual
2991 manner as a label (by means of `ASM_OUTPUT_LABEL').
2993 Defined in svr4.h. */
2994 /* #define ASM_DECLARE_FUNCTION_NAME(STREAM, NAME, DECL) */
2996 /* A C statement (sans semicolon) to output to the stdio stream STREAM any text
2997 necessary for declaring the size of a function which is being defined. The
2998 argument NAME is the name of the function. The argument DECL is the
2999 `FUNCTION_DECL' tree node representing the function.
3001 If this macro is not defined, then the function size is not defined.
3003 Defined in svr4.h. */
3004 /* #define ASM_DECLARE_FUNCTION_SIZE(STREAM, NAME, DECL) */
3006 /* A C statement (sans semicolon) to output to the stdio stream STREAM any text
3007 necessary for declaring the name NAME of an initialized variable which is
3008 being defined. This macro must output the label definition (perhaps using
3009 `ASM_OUTPUT_LABEL'). The argument DECL is the `VAR_DECL' tree node
3010 representing the variable.
3012 If this macro is not defined, then the variable name is defined in the usual
3013 manner as a label (by means of `ASM_OUTPUT_LABEL').
3015 Defined in svr4.h. */
3016 /* #define ASM_DECLARE_OBJECT_NAME(STREAM, NAME, DECL) */
3018 /* A C statement (sans semicolon) to finish up declaring a variable name once
3019 the compiler has processed its initializer fully and thus has had a chance
3020 to determine the size of an array when controlled by an initializer. This
3021 is used on systems where it's necessary to declare something about the size
3024 If you don't define this macro, that is equivalent to defining it to do
3027 Defined in svr4.h. */
3028 /* #define ASM_FINISH_DECLARE_OBJECT(STREAM, DECL, TOPLEVEL, ATEND) */
3030 /* A C statement (sans semicolon) to output to the stdio stream STREAM some
3031 commands that will make the label NAME global; that is, available for
3032 reference from other files. Use the expression `assemble_name (STREAM,
3033 NAME)' to output the name itself; before and after that, output the
3034 additional assembler syntax for making that name global, and a newline. */
3035 #define ASM_GLOBALIZE_LABEL(STREAM,NAME) \
3037 fputs ("\t.globl ", STREAM); \
3038 assemble_name (STREAM, NAME); \
3039 fputs ("\n", STREAM); \
3042 /* A C statement (sans semicolon) to output to the stdio stream STREAM some
3043 commands that will make the label NAME weak; that is, available for
3044 reference from other files but only used if no other definition is
3045 available. Use the expression `assemble_name (STREAM, NAME)' to output the
3046 name itself; before and after that, output the additional assembler syntax
3047 for making that name weak, and a newline.
3049 If you don't define this macro, GNU CC will not support weak symbols and you
3050 should not define the `SUPPORTS_WEAK' macro.
3052 Defined in svr4.h. */
3053 /* #define ASM_WEAKEN_LABEL */
3055 /* A C expression which evaluates to true if the target supports weak symbols.
3057 If you don't define this macro, `defaults.h' provides a default definition.
3058 If `ASM_WEAKEN_LABEL' is defined, the default definition is `1'; otherwise,
3059 it is `0'. Define this macro if you want to control weak symbol support
3060 with a compiler flag such as `-melf'. */
3061 /* #define SUPPORTS_WEAK */
3063 /* A C statement (sans semicolon) to mark DECL to be emitted as a
3064 public symbol such that extra copies in multiple translation units
3065 will be discarded by the linker. Define this macro if your object
3066 file format provides support for this concept, such as the `COMDAT'
3067 section flags in the Microsoft Windows PE/COFF format, and this
3068 support requires changes to DECL, such as putting it in a separate
3071 Defined in svr4.h. */
3072 /* #define MAKE_DECL_ONE_ONLY */
3074 /* A C expression which evaluates to true if the target supports one-only
3077 If you don't define this macro, `varasm.c' provides a default definition.
3078 If `MAKE_DECL_ONE_ONLY' is defined, the default definition is `1';
3079 otherwise, it is `0'. Define this macro if you want to control one-only
3080 symbol support with a compiler flag, or if setting the `DECL_ONE_ONLY' flag
3081 is enough to mark a declaration to be emitted as one-only. */
3082 /* #define SUPPORTS_ONE_ONLY */
3084 /* A C statement (sans semicolon) to output to the stdio stream STREAM any text
3085 necessary for declaring the name of an external symbol named NAME which is
3086 referenced in this compilation but not defined. The value of DECL is the
3087 tree node for the declaration.
3089 This macro need not be defined if it does not need to output anything. The
3090 GNU assembler and most Unix assemblers don't require anything. */
3091 /* #define ASM_OUTPUT_EXTERNAL(STREAM, DECL, NAME) */
3093 /* A C statement (sans semicolon) to output on STREAM an assembler pseudo-op to
3094 declare a library function name external. The name of the library function
3095 is given by SYMREF, which has type `rtx' and is a `symbol_ref'.
3097 This macro need not be defined if it does not need to output anything. The
3098 GNU assembler and most Unix assemblers don't require anything.
3100 Defined in svr4.h. */
3101 /* #define ASM_OUTPUT_EXTERNAL_LIBCALL(STREAM, SYMREF) */
3103 /* A C statement (sans semicolon) to output to the stdio stream STREAM a
3104 reference in assembler syntax to a label named NAME. This should add `_' to
3105 the front of the name, if that is customary on your operating system, as it
3106 is in most Berkeley Unix systems. This macro is used in `assemble_name'. */
3107 /* #define ASM_OUTPUT_LABELREF(STREAM, NAME) */
3109 /* A C statement to output to the stdio stream STREAM a label whose name is
3110 made from the string PREFIX and the number NUM.
3112 It is absolutely essential that these labels be distinct from the labels
3113 used for user-level functions and variables. Otherwise, certain programs
3114 will have name conflicts with internal labels.
3116 It is desirable to exclude internal labels from the symbol table of the
3117 object file. Most assemblers have a naming convention for labels that
3118 should be excluded; on many systems, the letter `L' at the beginning of a
3119 label has this effect. You should find out what convention your system
3120 uses, and follow it.
3122 The usual definition of this macro is as follows:
3124 fprintf (STREAM, "L%s%d:\n", PREFIX, NUM)
3126 Defined in svr4.h. */
3127 /* #define ASM_OUTPUT_INTERNAL_LABEL(STREAM, PREFIX, NUM) */
3129 /* A C statement to store into the string STRING a label whose name is made
3130 from the string PREFIX and the number NUM.
3132 This string, when output subsequently by `assemble_name', should produce the
3133 output that `ASM_OUTPUT_INTERNAL_LABEL' would produce with the same PREFIX
3136 If the string begins with `*', then `assemble_name' will output the rest of
3137 the string unchanged. It is often convenient for
3138 `ASM_GENERATE_INTERNAL_LABEL' to use `*' in this way. If the string doesn't
3139 start with `*', then `ASM_OUTPUT_LABELREF' gets to output the string, and
3140 may change it. (Of course, `ASM_OUTPUT_LABELREF' is also part of your
3141 machine description, so you should know what it does on your machine.)
3143 Defined in svr4.h. */
3144 /* #define ASM_GENERATE_INTERNAL_LABEL(LABEL, PREFIX, NUM) */
3146 /* A C expression to assign to OUTVAR (which is a variable of type `char *') a
3147 newly allocated string made from the string NAME and the number NUMBER, with
3148 some suitable punctuation added. Use `alloca' to get space for the string.
3150 The string will be used as an argument to `ASM_OUTPUT_LABELREF' to produce
3151 an assembler label for an internal static variable whose name is NAME.
3152 Therefore, the string must be such as to result in valid assembler code.
3153 The argument NUMBER is different each time this macro is executed; it
3154 prevents conflicts between similarly-named internal static variables in
3157 Ideally this string should not be a valid C identifier, to prevent any
3158 conflict with the user's own symbols. Most assemblers allow periods or
3159 percent signs in assembler symbols; putting at least one of these between
3160 the name and the number will suffice. */
3161 #define ASM_FORMAT_PRIVATE_NAME(OUTVAR, NAME, NUMBER) \
3163 (OUTVAR) = (char *) alloca (strlen ((NAME)) + 12); \
3164 sprintf ((OUTVAR), "%s.%ld", (NAME), (long)(NUMBER)); \
3167 /* A C statement to output to the stdio stream STREAM assembler code which
3168 defines (equates) the symbol NAME to have the value VALUE.
3170 If SET_ASM_OP is defined, a default definition is provided which is correct
3173 Defined in svr4.h. */
3174 /* #define ASM_OUTPUT_DEF(STREAM, NAME, VALUE) */
3176 /* A C statement to output to the stdio stream STREAM assembler code which
3177 defines (equates) the weak symbol NAME to have the value VALUE.
3179 Define this macro if the target only supports weak aliases; define
3180 ASM_OUTPUT_DEF instead if possible. */
3181 /* #define ASM_OUTPUT_WEAK_ALIAS (STREAM, NAME, VALUE) */
3183 /* Define this macro to override the default assembler names used for Objective
3186 The default name is a unique method number followed by the name of the class
3187 (e.g. `_1_Foo'). For methods in categories, the name of the category is
3188 also included in the assembler name (e.g. `_1_Foo_Bar').
3190 These names are safe on most systems, but make debugging difficult since the
3191 method's selector is not present in the name. Therefore, particular systems
3192 define other ways of computing names.
3194 BUF is an expression of type `char *' which gives you a buffer in which to
3195 store the name; its length is as long as CLASS_NAME, CAT_NAME and SEL_NAME
3196 put together, plus 50 characters extra.
3198 The argument IS_INST specifies whether the method is an instance method or a
3199 class method; CLASS_NAME is the name of the class; CAT_NAME is the name of
3200 the category (or NULL if the method is not in a category); and SEL_NAME is
3201 the name of the selector.
3203 On systems where the assembler can handle quoted names, you can use this
3204 macro to provide more human-readable names. */
3205 /* #define OBJC_GEN_METHOD_LABEL(BUF, IS_INST, CLASS_NAME, CAT_NAME, SEL_NAME) */
3208 /* Macros Controlling Initialization Routines. */
3210 /* If defined, a C string constant for the assembler operation to identify the
3211 following data as initialization code. If not defined, GNU CC will assume
3212 such a section does not exist. When you are using special sections for
3213 initialization and termination functions, this macro also controls how
3214 `crtstuff.c' and `libgcc2.c' arrange to run the initialization functions.
3216 Defined in svr4.h. */
3217 /* #define INIT_SECTION_ASM_OP */
3219 /* If defined, `main' will not call `__main' as described above. This macro
3220 should be defined for systems that control the contents of the init section
3221 on a symbol-by-symbol basis, such as OSF/1, and should not be defined
3222 explicitly for systems that support `INIT_SECTION_ASM_OP'. */
3223 /* #define HAS_INIT_SECTION */
3225 /* If defined, a C string constant for a switch that tells the linker that the
3226 following symbol is an initialization routine. */
3227 /* #define LD_INIT_SWITCH */
3229 /* If defined, a C string constant for a switch that tells the linker that the
3230 following symbol is a finalization routine. */
3231 /* #define LD_FINI_SWITCH */
3233 /* If defined, `main' will call `__main' despite the presence of
3234 `INIT_SECTION_ASM_OP'. This macro should be defined for systems where the
3235 init section is not actually run automatically, but is still useful for
3236 collecting the lists of constructors and destructors. */
3237 /* #define INVOKE__main */
3239 /* Define this macro as a C statement to output on the stream STREAM the
3240 assembler code to arrange to call the function named NAME at initialization
3243 Assume that NAME is the name of a C function generated automatically by the
3244 compiler. This function takes no arguments. Use the function
3245 `assemble_name' to output the name NAME; this performs any system-specific
3246 syntactic transformations such as adding an underscore.
3248 If you don't define this macro, nothing special is output to arrange to call
3249 the function. This is correct when the function will be called in some
3250 other manner--for example, by means of the `collect2' program, which looks
3251 through the symbol table to find these functions by their names.
3253 Defined in svr4.h. */
3254 /* #define ASM_OUTPUT_CONSTRUCTOR(STREAM, NAME) */
3256 /* This is like `ASM_OUTPUT_CONSTRUCTOR' but used for termination functions
3257 rather than initialization functions.
3259 Defined in svr4.h. */
3260 /* #define ASM_OUTPUT_DESTRUCTOR(STREAM, NAME) */
3262 /* If your system uses `collect2' as the means of processing constructors, then
3263 that program normally uses `nm' to scan an object file for constructor
3264 functions to be called. On certain kinds of systems, you can define these
3265 macros to make `collect2' work faster (and, in some cases, make it work at
3268 /* Define this macro if the system uses COFF (Common Object File Format) object
3269 files, so that `collect2' can assume this format and scan object files
3270 directly for dynamic constructor/destructor functions. */
3271 /* #define OBJECT_FORMAT_COFF */
3273 /* Define this macro if the system uses ROSE format object files, so that
3274 `collect2' can assume this format and scan object files directly for dynamic
3275 constructor/destructor functions.
3277 These macros are effective only in a native compiler; `collect2' as
3278 part of a cross compiler always uses `nm' for the target machine. */
3279 /* #define OBJECT_FORMAT_ROSE */
3281 /* Define this macro if the system uses ELF format object files.
3283 Defined in svr4.h. */
3284 /* #define OBJECT_FORMAT_ELF */
3286 /* Define this macro as a C string constant containing the file name to use to
3287 execute `nm'. The default is to search the path normally for `nm'.
3289 If your system supports shared libraries and has a program to list the
3290 dynamic dependencies of a given library or executable, you can define these
3291 macros to enable support for running initialization and termination
3292 functions in shared libraries: */
3293 /* #define REAL_NM_FILE_NAME */
3295 /* Define this macro to a C string constant containing the name of the program
3296 which lists dynamic dependencies, like `"ldd"' under SunOS 4. */
3297 /* #define LDD_SUFFIX */
3299 /* Define this macro to be C code that extracts filenames from the output of
3300 the program denoted by `LDD_SUFFIX'. PTR is a variable of type `char *'
3301 that points to the beginning of a line of output from `LDD_SUFFIX'. If the
3302 line lists a dynamic dependency, the code must advance PTR to the beginning
3303 of the filename on that line. Otherwise, it must set PTR to `NULL'. */
3304 /* #define PARSE_LDD_OUTPUT (PTR) */
3307 /* Output of Assembler Instructions. */
3309 /* A C initializer containing the assembler's names for the machine registers,
3310 each one as a C string constant. This is what translates register numbers
3311 in the compiler into assembler language. */
3312 #define REGISTER_NAMES \
3313 { "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "r10", \
3314 "r11", "r12", "r13", "psw", "sp", "carry", "fp", "ap" }
3316 /* If defined, a C initializer for an array of structures containing a name and
3317 a register number. This macro defines additional names for hard registers,
3318 thus allowing the `asm' option in declarations to refer to registers using
3320 #define ADDITIONAL_REGISTER_NAMES \
3324 /* Define this macro if you are using an unusual assembler that requires
3325 different names for the machine instructions.
3327 The definition is a C statement or statements which output an assembler
3328 instruction opcode to the stdio stream STREAM. The macro-operand PTR is a
3329 variable of type `char *' which points to the opcode name in its "internal"
3330 form--the form that is written in the machine description. The definition
3331 should output the opcode name to STREAM, performing any translation you
3332 desire, and increment the variable PTR to point at the end of the opcode so
3333 that it will not be output twice.
3335 In fact, your macro definition may process less than the entire opcode name,
3336 or more than the opcode name; but if you want to process text that includes
3337 `%'-sequences to substitute operands, you must take care of the substitution
3338 yourself. Just be sure to increment PTR over whatever text should not be
3341 If you need to look at the operand values, they can be found as the elements
3342 of `recog_data.operand'.
3344 If the macro definition does nothing, the instruction is output in the usual
3346 /* #define ASM_OUTPUT_OPCODE(STREAM, PTR) */
3348 /* If defined, a C statement to be executed just prior to the output of
3349 assembler code for INSN, to modify the extracted operands so they will be
3352 Here the argument OPVEC is the vector containing the operands extracted from
3353 INSN, and NOPERANDS is the number of elements of the vector which contain
3354 meaningful data for this insn. The contents of this vector are what will be
3355 used to convert the insn template into assembler code, so you can change the
3356 assembler output by changing the contents of the vector.
3358 This macro is useful when various assembler syntaxes share a single file of
3359 instruction patterns; by defining this macro differently, you can cause a
3360 large class of instructions to be output differently (such as with
3361 rearranged operands). Naturally, variations in assembler syntax affecting
3362 individual insn patterns ought to be handled by writing conditional output
3363 routines in those patterns.
3365 If this macro is not defined, it is equivalent to a null statement. */
3366 /* #define FINAL_PRESCAN_INSN(INSN, OPVEC, NOPERANDS) */
3368 /* If defined, `FINAL_PRESCAN_INSN' will be called on each
3369 `CODE_LABEL'. In that case, OPVEC will be a null pointer and
3370 NOPERANDS will be zero. */
3371 /* #define FINAL_PRESCAN_LABEL */
3373 /* A C compound statement to output to stdio stream STREAM the assembler syntax
3374 for an instruction operand X. X is an RTL expression.
3376 CODE is a value that can be used to specify one of several ways of printing
3377 the operand. It is used when identical operands must be printed differently
3378 depending on the context. CODE comes from the `%' specification that was
3379 used to request printing of the operand. If the specification was just
3380 `%DIGIT' then CODE is 0; if the specification was `%LTR DIGIT' then CODE is
3381 the ASCII code for LTR.
3383 If X is a register, this macro should print the register's name. The names
3384 can be found in an array `reg_names' whose type is `char *[]'. `reg_names'
3385 is initialized from `REGISTER_NAMES'.
3387 When the machine description has a specification `%PUNCT' (a `%' followed by
3388 a punctuation character), this macro is called with a null pointer for X and
3389 the punctuation character for CODE. */
3390 #define PRINT_OPERAND(STREAM, X, CODE) xstormy16_print_operand (STREAM, X, CODE)
3392 /* A C expression which evaluates to true if CODE is a valid punctuation
3393 character for use in the `PRINT_OPERAND' macro. If
3394 `PRINT_OPERAND_PUNCT_VALID_P' is not defined, it means that no punctuation
3395 characters (except for the standard one, `%') are used in this way. */
3396 /* #define PRINT_OPERAND_PUNCT_VALID_P(CODE) */
3398 /* A C compound statement to output to stdio stream STREAM the assembler syntax
3399 for an instruction operand that is a memory reference whose address is X. X
3400 is an RTL expression.
3402 On some machines, the syntax for a symbolic address depends on the section
3403 that the address refers to. On these machines, define the macro
3404 `ENCODE_SECTION_INFO' to store the information into the `symbol_ref', and
3405 then check for it here.
3407 This declaration must be present. */
3408 #define PRINT_OPERAND_ADDRESS(STREAM, X) xstormy16_print_operand_address (STREAM, X)
3410 /* A C statement, to be executed after all slot-filler instructions have been
3411 output. If necessary, call `dbr_sequence_length' to determine the number of
3412 slots filled in a sequence (zero if not currently outputting a sequence), to
3413 decide how many no-ops to output, or whatever.
3415 Don't define this macro if it has nothing to do, but it is helpful in
3416 reading assembly output if the extent of the delay sequence is made explicit
3417 (e.g. with white space).
3419 Note that output routines for instructions with delay slots must be prepared
3420 to deal with not being output as part of a sequence (i.e. when the
3421 scheduling pass is not run, or when no slot fillers could be found.) The
3422 variable `final_sequence' is null when not processing a sequence, otherwise
3423 it contains the `sequence' rtx being output. */
3424 /* #define DBR_OUTPUT_SEQEND(FILE) */
3426 /* If defined, C string expressions to be used for the `%R', `%L', `%U', and
3427 `%I' options of `asm_fprintf' (see `final.c'). These are useful when a
3428 single `md' file must support multiple assembler formats. In that case, the
3429 various `tm.h' files can define these macros differently.
3431 USER_LABEL_PREFIX is defined in svr4.h. */
3432 #define REGISTER_PREFIX ""
3433 #define LOCAL_LABEL_PREFIX "."
3434 #define USER_LABEL_PREFIX ""
3435 #define IMMEDIATE_PREFIX "#"
3437 /* If your target supports multiple dialects of assembler language (such as
3438 different opcodes), define this macro as a C expression that gives the
3439 numeric index of the assembler language dialect to use, with zero as the
3442 If this macro is defined, you may use `{option0|option1|option2...}'
3443 constructs in the output templates of patterns or in the first argument of
3444 `asm_fprintf'. This construct outputs `option0', `option1' or `option2',
3445 etc., if the value of `ASSEMBLER_DIALECT' is zero, one or two, etc. Any
3446 special characters within these strings retain their usual meaning.
3448 If you do not define this macro, the characters `{', `|' and `}' do not have
3449 any special meaning when used in templates or operands to `asm_fprintf'.
3451 Define the macros `REGISTER_PREFIX', `LOCAL_LABEL_PREFIX',
3452 `USER_LABEL_PREFIX' and `IMMEDIATE_PREFIX' if you can express the variations
3453 in assemble language syntax with that mechanism. Define `ASSEMBLER_DIALECT'
3454 and use the `{option0|option1}' syntax if the syntax variant are larger and
3455 involve such things as different opcodes or operand order. */
3456 /* #define ASSEMBLER_DIALECT */
3458 /* A C expression to output to STREAM some assembler code which will push hard
3459 register number REGNO onto the stack. The code need not be optimal, since
3460 this macro is used only when profiling. */
3461 #define ASM_OUTPUT_REG_PUSH(STREAM, REGNO) \
3462 fprintf (STREAM, "\tpush %d\n", REGNO)
3464 /* A C expression to output to STREAM some assembler code which will pop hard
3465 register number REGNO off of the stack. The code need not be optimal, since
3466 this macro is used only when profiling. */
3467 #define ASM_OUTPUT_REG_POP(STREAM, REGNO) \
3468 fprintf (STREAM, "\tpop %d\n", REGNO)
3471 /* Output of dispatch tables. */
3473 /* This port does not use the ASM_OUTPUT_ADDR_VEC_ELT macro, because
3474 this could cause label alignment to appear between the 'br' and the table,
3475 which would be bad. Instead, it controls the output of the table
3477 #define ASM_OUTPUT_ADDR_VEC(LABEL, BODY) \
3478 xstormy16_output_addr_vec (file, LABEL, BODY)
3480 /* Alignment for ADDR_VECs is the same as for code. */
3481 #define ADDR_VEC_ALIGN(ADDR_VEC) 1
3484 /* Assembler Commands for Exception Regions. */
3486 /* An rtx used to mask the return address found via RETURN_ADDR_RTX, so that it
3487 does not contain any extraneous set bits in it. */
3488 /* #define MASK_RETURN_ADDR */
3490 /* Define this macro to 0 if your target supports DWARF 2 frame unwind
3491 information, but it does not yet work with exception handling. Otherwise,
3492 if your target supports this information (if it defines
3493 `INCOMING_RETURN_ADDR_RTX'), GCC will provide a default definition of 1.
3495 If this macro is defined to 1, the DWARF 2 unwinder will be the default
3496 exception handling mechanism; otherwise, setjmp/longjmp will be used by
3499 If this macro is defined to anything, the DWARF 2 unwinder will be used
3500 instead of inline unwinders and __unwind_function in the non-setjmp case. */
3501 #define DWARF2_UNWIND_INFO 0
3503 /* Don't use __builtin_setjmp for unwinding, since it's tricky to get
3504 at the high 16 bits of an address. */
3505 #define DONT_USE_BUILTIN_SETJMP
3506 #define JMP_BUF_SIZE 8
3508 /* Assembler Commands for Alignment. */
3510 /* The alignment (log base 2) to put in front of LABEL, which follows
3513 This macro need not be defined if you don't want any special alignment to be
3514 done at such a time. Most machine descriptions do not currently define the
3516 /* #define LABEL_ALIGN_AFTER_BARRIER(LABEL) */
3518 /* The desired alignment for the location counter at the beginning
3521 This macro need not be defined if you don't want any special alignment to be
3522 done at such a time. Most machine descriptions do not currently define the
3524 /* #define LOOP_ALIGN(LABEL) */
3526 /* A C statement to output to the stdio stream STREAM an assembler instruction
3527 to advance the location counter by NBYTES bytes. Those bytes should be zero
3528 when loaded. NBYTES will be a C expression of type `int'.
3530 Defined in elfos.h. */
3531 /* #define ASM_OUTPUT_SKIP(STREAM, NBYTES) */
3533 /* Define this macro if `ASM_OUTPUT_SKIP' should not be used in the text
3534 section because it fails put zeros in the bytes that are skipped. This is
3535 true on many Unix systems, where the pseudo-op to skip bytes produces no-op
3536 instructions rather than zeros when used in the text section. */
3537 /* #define ASM_NO_SKIP_IN_TEXT */
3539 /* A C statement to output to the stdio stream STREAM an assembler command to
3540 advance the location counter to a multiple of 2 to the POWER bytes. POWER
3541 will be a C expression of type `int'. */
3542 #define ASM_OUTPUT_ALIGN(STREAM, POWER) \
3543 fprintf ((STREAM), "\t.p2align %d\n", (POWER))
3546 /* Macros Affecting all Debug Formats. */
3548 /* A C expression that returns the integer offset value for an automatic
3549 variable having address X (an RTL expression). The default computation
3550 assumes that X is based on the frame-pointer and gives the offset from the
3551 frame-pointer. This is required for targets that produce debugging output
3552 for DBX or COFF-style debugging output for SDB and allow the frame-pointer
3553 to be eliminated when the `-g' options is used. */
3554 /* #define DEBUGGER_AUTO_OFFSET(X) */
3556 /* A C expression that returns the integer offset value for an argument having
3557 address X (an RTL expression). The nominal offset is OFFSET. */
3558 /* #define DEBUGGER_ARG_OFFSET(OFFSET, X) */
3560 /* A C expression that returns the type of debugging output GNU CC produces
3561 when the user specifies `-g' or `-ggdb'. Define this if you have arranged
3562 for GNU CC to support more than one format of debugging output. Currently,
3563 the allowable values are `DBX_DEBUG', `SDB_DEBUG', `DWARF_DEBUG',
3564 `DWARF2_DEBUG', and `XCOFF_DEBUG'.
3566 The value of this macro only affects the default debugging output; the user
3567 can always get a specific type of output by using `-gstabs', `-gcoff',
3568 `-gdwarf-1', `-gdwarf-2', or `-gxcoff'.
3570 Defined in svr4.h. */
3571 #undef PREFERRED_DEBUGGING_TYPE
3572 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
3575 /* Specific Options for DBX Output. */
3577 /* Define this macro if GNU CC should produce debugging output for DBX in
3578 response to the `-g' option.
3580 Defined in svr4.h. */
3581 /* #define DBX_DEBUGGING_INFO */
3583 /* Define this macro if GNU CC should produce XCOFF format debugging output in
3584 response to the `-g' option. This is a variant of DBX format. */
3585 /* #define XCOFF_DEBUGGING_INFO */
3587 /* Define this macro to control whether GNU CC should by default generate GDB's
3588 extended version of DBX debugging information (assuming DBX-format debugging
3589 information is enabled at all). If you don't define the macro, the default
3590 is 1: always generate the extended information if there is any occasion to. */
3591 /* #define DEFAULT_GDB_EXTENSIONS */
3593 /* Define this macro if all `.stabs' commands should be output while in the
3595 /* #define DEBUG_SYMS_TEXT */
3597 /* A C string constant naming the assembler pseudo op to use instead of
3598 `.stabs' to define an ordinary debugging symbol. If you don't define this
3599 macro, `.stabs' is used. This macro applies only to DBX debugging
3600 information format. */
3601 /* #define ASM_STABS_OP */
3603 /* A C string constant naming the assembler pseudo op to use instead of
3604 `.stabd' to define a debugging symbol whose value is the current location.
3605 If you don't define this macro, `.stabd' is used. This macro applies only
3606 to DBX debugging information format. */
3607 /* #define ASM_STABD_OP */
3609 /* A C string constant naming the assembler pseudo op to use instead of
3610 `.stabn' to define a debugging symbol with no name. If you don't define
3611 this macro, `.stabn' is used. This macro applies only to DBX debugging
3612 information format. */
3613 /* #define ASM_STABN_OP */
3615 /* Define this macro if DBX on your system does not support the construct
3616 `xsTAGNAME'. On some systems, this construct is used to describe a forward
3617 reference to a structure named TAGNAME. On other systems, this construct is
3618 not supported at all. */
3619 /* #define DBX_NO_XREFS */
3621 /* A symbol name in DBX-format debugging information is normally continued
3622 (split into two separate `.stabs' directives) when it exceeds a certain
3623 length (by default, 80 characters). On some operating systems, DBX requires
3624 this splitting; on others, splitting must not be done. You can inhibit
3625 splitting by defining this macro with the value zero. You can override the
3626 default splitting-length by defining this macro as an expression for the
3627 length you desire. */
3628 /* #define DBX_CONTIN_LENGTH */
3630 /* Normally continuation is indicated by adding a `\' character to the end of a
3631 `.stabs' string when a continuation follows. To use a different character
3632 instead, define this macro as a character constant for the character you
3633 want to use. Do not define this macro if backslash is correct for your
3635 /* #define DBX_CONTIN_CHAR */
3637 /* Define this macro if it is necessary to go to the data section before
3638 outputting the `.stabs' pseudo-op for a non-global static variable. */
3639 /* #define DBX_STATIC_STAB_DATA_SECTION */
3641 /* The value to use in the "code" field of the `.stabs' directive for a
3642 typedef. The default is `N_LSYM'. */
3643 /* #define DBX_TYPE_DECL_STABS_CODE */
3645 /* The value to use in the "code" field of the `.stabs' directive for a static
3646 variable located in the text section. DBX format does not provide any
3647 "right" way to do this. The default is `N_FUN'. */
3648 /* #define DBX_STATIC_CONST_VAR_CODE */
3650 /* The value to use in the "code" field of the `.stabs' directive for a
3651 parameter passed in registers. DBX format does not provide any "right" way
3652 to do this. The default is `N_RSYM'. */
3653 /* #define DBX_REGPARM_STABS_CODE */
3655 /* The letter to use in DBX symbol data to identify a symbol as a parameter
3656 passed in registers. DBX format does not customarily provide any way to do
3657 this. The default is `'P''. */
3658 /* #define DBX_REGPARM_STABS_LETTER */
3660 /* The letter to use in DBX symbol data to identify a symbol as a stack
3661 parameter. The default is `'p''. */
3662 /* #define DBX_MEMPARM_STABS_LETTER */
3664 /* Define this macro if the DBX information for a function and its arguments
3665 should precede the assembler code for the function. Normally, in DBX
3666 format, the debugging information entirely follows the assembler code.
3668 Defined in svr4.h. */
3669 /* #define DBX_FUNCTION_FIRST */
3671 /* Define this macro if the `N_LBRAC' symbol for a block should precede the
3672 debugging information for variables and functions defined in that block.
3673 Normally, in DBX format, the `N_LBRAC' symbol comes first. */
3674 /* #define DBX_LBRAC_FIRST */
3676 /* Define this macro if the value of a symbol describing the scope of a block
3677 (`N_LBRAC' or `N_RBRAC') should be relative to the start of the enclosing
3678 function. Normally, GNU C uses an absolute address.
3680 Defined in svr4.h. */
3681 /* #define DBX_BLOCKS_FUNCTION_RELATIVE */
3683 /* Define this macro if GNU C should generate `N_BINCL' and `N_EINCL'
3684 stabs for included header files, as on Sun systems. This macro
3685 also directs GNU C to output a type number as a pair of a file
3686 number and a type number within the file. Normally, GNU C does not
3687 generate `N_BINCL' or `N_EINCL' stabs, and it outputs a single
3688 number for a type number. */
3689 /* #define DBX_USE_BINCL */
3692 /* Open ended Hooks for DBX Output. */
3694 /* Define this macro to say how to output to STREAM the debugging information
3695 for the start of a scope level for variable names. The argument NAME is the
3696 name of an assembler symbol (for use with `assemble_name') whose value is
3697 the address where the scope begins. */
3698 /* #define DBX_OUTPUT_LBRAC(STREAM, NAME) */
3700 /* Like `DBX_OUTPUT_LBRAC', but for the end of a scope level. */
3701 /* #define DBX_OUTPUT_RBRAC(STREAM, NAME) */
3703 /* Define this macro if the target machine requires special handling to output
3704 an enumeration type. The definition should be a C statement (sans
3705 semicolon) to output the appropriate information to STREAM for the type
3707 /* #define DBX_OUTPUT_ENUM(STREAM, TYPE) */
3709 /* Define this macro if the target machine requires special output at the end
3710 of the debugging information for a function. The definition should be a C
3711 statement (sans semicolon) to output the appropriate information to STREAM.
3712 FUNCTION is the `FUNCTION_DECL' node for the function. */
3713 /* #define DBX_OUTPUT_FUNCTION_END(STREAM, FUNCTION) */
3715 /* Define this macro if you need to control the order of output of the standard
3716 data types at the beginning of compilation. The argument SYMS is a `tree'
3717 which is a chain of all the predefined global symbols, including names of
3720 Normally, DBX output starts with definitions of the types for integers and
3721 characters, followed by all the other predefined types of the particular
3722 language in no particular order.
3724 On some machines, it is necessary to output different particular types
3725 first. To do this, define `DBX_OUTPUT_STANDARD_TYPES' to output those
3726 symbols in the necessary order. Any predefined types that you don't
3727 explicitly output will be output afterward in no particular order.
3729 Be careful not to define this macro so that it works only for C. There are
3730 no global variables to access most of the built-in types, because another
3731 language may have another set of types. The way to output a particular type
3732 is to look through SYMS to see if you can find it. Here is an example:
3736 for (decl = syms; decl; decl = TREE_CHAIN (decl))
3737 if (!strcmp (IDENTIFIER_POINTER (DECL_NAME (decl)),
3739 dbxout_symbol (decl);
3743 This does nothing if the expected type does not exist.
3745 See the function `init_decl_processing' in `c-decl.c' to find the names to
3746 use for all the built-in C types. */
3747 /* #define DBX_OUTPUT_STANDARD_TYPES(SYMS) */
3749 /* Some stabs encapsulation formats (in particular ECOFF), cannot
3750 handle the `.stabs "",N_FUN,,0,0,Lscope-function-1' gdb dbx
3751 extension construct. On those machines, define this macro to turn
3752 this feature off without disturbing the rest of the gdb extensions. */
3753 /* #define NO_DBX_FUNCTION_END */
3756 /* File names in DBX format. */
3758 /* Define this if DBX wants to have the current directory recorded in each
3761 Note that the working directory is always recorded if GDB extensions are
3763 /* #define DBX_WORKING_DIRECTORY */
3765 /* A C statement to output DBX debugging information to the stdio stream STREAM
3766 which indicates that file NAME is the main source file--the file specified
3767 as the input file for compilation. This macro is called only once, at the
3768 beginning of compilation.
3770 This macro need not be defined if the standard form of output for DBX
3771 debugging information is appropriate.
3773 Defined in svr4.h. */
3774 /* #define DBX_OUTPUT_MAIN_SOURCE_FILENAME(STREAM, NAME) */
3776 /* A C statement to output DBX debugging information to the stdio stream STREAM
3777 which indicates that the current directory during compilation is named NAME.
3779 This macro need not be defined if the standard form of output for DBX
3780 debugging information is appropriate. */
3781 /* #define DBX_OUTPUT_MAIN_SOURCE_DIRECTORY(STREAM, NAME) */
3783 /* A C statement to output DBX debugging information at the end of compilation
3784 of the main source file NAME.
3786 If you don't define this macro, nothing special is output at the end of
3787 compilation, which is correct for most machines. */
3788 /* #define DBX_OUTPUT_MAIN_SOURCE_FILE_END(STREAM, NAME) */
3790 /* A C statement to output DBX debugging information to the stdio stream STREAM
3791 which indicates that file NAME is the current source file. This output is
3792 generated each time input shifts to a different source file as a result of
3793 `#include', the end of an included file, or a `#line' command.
3795 This macro need not be defined if the standard form of output for DBX
3796 debugging information is appropriate. */
3797 /* #define DBX_OUTPUT_SOURCE_FILENAME(STREAM, NAME) */
3800 /* Macros for SDB and Dwarf Output. */
3802 /* Define this macro if GNU CC should produce COFF-style debugging output for
3803 SDB in response to the `-g' option. */
3804 /* #define SDB_DEBUGGING_INFO */
3806 /* Define this macro if GNU CC should produce dwarf format debugging output in
3807 response to the `-g' option.
3809 Defined in svr4.h. */
3810 /* #define DWARF_DEBUGGING_INFO */
3812 /* Define this macro if GNU CC should produce dwarf version 2 format debugging
3813 output in response to the `-g' option.
3815 To support optional call frame debugging information, you must also define
3816 `INCOMING_RETURN_ADDR_RTX' and either set `RTX_FRAME_RELATED_P' on the
3817 prologue insns if you use RTL for the prologue, or call `dwarf2out_def_cfa'
3818 and `dwarf2out_reg_save' as appropriate from `TARGET_ASM_FUNCTION_PROLOGUE'
3821 Defined in svr4.h. */
3822 /* #define DWARF2_DEBUGGING_INFO */
3824 /* Define this macro if GNU CC should produce dwarf version 2-style
3825 line numbers. This usually requires extending the assembler to
3826 support them, and #defining DWARF2_LINE_MIN_INSN_LENGTH in the
3827 assembler configuration header files. */
3828 /* #define DWARF2_ASM_LINE_DEBUG_INFO 1 */
3830 /* Define this macro if addresses in Dwarf 2 debugging info should not
3831 be the same size as pointers on the target architecture. The
3832 macro's value should be the size, in bytes, to use for addresses in
3835 Some architectures use word addresses to refer to code locations,
3836 but Dwarf 2 info always uses byte addresses. On such machines,
3837 Dwarf 2 addresses need to be larger than the architecture's
3839 #define DWARF2_ADDR_SIZE 4
3841 /* Define these macros to override the assembler syntax for the special SDB
3842 assembler directives. See `sdbout.c' for a list of these macros and their
3843 arguments. If the standard syntax is used, you need not define them
3845 /* #define PUT_SDB_... */
3847 /* Some assemblers do not support a semicolon as a delimiter, even between SDB
3848 assembler directives. In that case, define this macro to be the delimiter
3849 to use (usually `\n'). It is not necessary to define a new set of
3850 `PUT_SDB_OP' macros if this is the only change required. */
3851 /* #define SDB_DELIM */
3853 /* Define this macro to override the usual method of constructing a dummy name
3854 for anonymous structure and union types. See `sdbout.c' for more
3856 /* #define SDB_GENERATE_FAKE */
3858 /* Define this macro to allow references to unknown structure, union, or
3859 enumeration tags to be emitted. Standard COFF does not allow handling of
3860 unknown references, MIPS ECOFF has support for it. */
3861 /* #define SDB_ALLOW_UNKNOWN_REFERENCES */
3863 /* Define this macro to allow references to structure, union, or enumeration
3864 tags that have not yet been seen to be handled. Some assemblers choke if
3865 forward tags are used, while some require it. */
3866 /* #define SDB_ALLOW_FORWARD_REFERENCES */
3869 /* Miscellaneous Parameters. */
3871 /* Define REAL_ARITHMETIC to use a software emulator for the target floating
3872 point mode. Otherwise the host floating point mode is used. */
3873 #define REAL_ARITHMETIC
3875 /* Define this if you have defined special-purpose predicates in the file
3876 `MACHINE.c'. This macro is called within an initializer of an array of
3877 structures. The first field in the structure is the name of a predicate and
3878 the second field is an array of rtl codes. For each predicate, list all rtl
3879 codes that can be in expressions matched by the predicate. The list should
3880 have a trailing comma. Here is an example of two entries in the list for a
3881 typical RISC machine:
3883 #define PREDICATE_CODES \
3884 {"gen_reg_rtx_operand", {SUBREG, REG}}, \
3885 {"reg_or_short_cint_operand", {SUBREG, REG, CONST_INT}},
3887 Defining this macro does not affect the generated code (however, incorrect
3888 definitions that omit an rtl code that may be matched by the predicate can
3889 cause the compiler to malfunction). Instead, it allows the table built by
3890 `genrecog' to be more compact and efficient, thus speeding up the compiler.
3891 The most important predicates to include in the list specified by this macro
3892 are thoses used in the most insn patterns. */
3893 #define PREDICATE_CODES \
3894 {"shift_operator", {ASHIFT, ASHIFTRT, LSHIFTRT }}, \
3895 {"equality_operator", {EQ, NE }}, \
3896 {"inequality_operator", {GE, GT, LE, LT, GEU, GTU, LEU, LTU }}, \
3897 {"xstormy16_ineqsi_operator", {LT, GE, LTU, GEU }}, \
3898 {"nonimmediate_nonstack_operand", {REG, MEM}},
3899 /* An alias for a machine mode name. This is the machine mode that elements of
3900 a jump-table should have. */
3901 #define CASE_VECTOR_MODE SImode
3903 /* Define as C expression which evaluates to nonzero if the tablejump
3904 instruction expects the table to contain offsets from the address of the
3906 Do not define this if the table should contain absolute addresses. */
3907 /* #define CASE_VECTOR_PC_RELATIVE 1 */
3909 /* Define this if control falls through a `case' insn when the index value is
3910 out of range. This means the specified default-label is actually ignored by
3911 the `case' insn proper. */
3912 /* #define CASE_DROPS_THROUGH */
3914 /* Define this to be the smallest number of different values for which it is
3915 best to use a jump-table instead of a tree of conditional branches. The
3916 default is four for machines with a `casesi' instruction and five otherwise.
3917 This is best for most machines. */
3918 /* #define CASE_VALUES_THRESHOLD */
3920 /* Define this macro if operations between registers with integral mode smaller
3921 than a word are always performed on the entire register. Most RISC machines
3922 have this property and most CISC machines do not. */
3923 #define WORD_REGISTER_OPERATIONS
3925 /* Define this macro to be a C expression indicating when insns that read
3926 memory in MODE, an integral mode narrower than a word, set the bits outside
3927 of MODE to be either the sign-extension or the zero-extension of the data
3928 read. Return `SIGN_EXTEND' for values of MODE for which the insn
3929 sign-extends, `ZERO_EXTEND' for which it zero-extends, and `NIL' for other
3932 This macro is not called with MODE non-integral or with a width greater than
3933 or equal to `BITS_PER_WORD', so you may return any value in this case. Do
3934 not define this macro if it would always return `NIL'. On machines where
3935 this macro is defined, you will normally define it as the constant
3936 `SIGN_EXTEND' or `ZERO_EXTEND'. */
3937 #define LOAD_EXTEND_OP(MODE) ZERO_EXTEND
3939 /* Define if loading short immediate values into registers sign extends. */
3940 /* #define SHORT_IMMEDIATES_SIGN_EXTEND */
3942 /* Define this macro if the same instructions that convert a floating point
3943 number to a signed fixed point number also convert validly to an unsigned
3945 /* #define FIXUNS_TRUNC_LIKE_FIX_TRUNC */
3947 /* The maximum number of bytes that a single instruction can move quickly from
3948 memory to memory. */
3951 /* The maximum number of bytes that a single instruction can move quickly from
3952 memory to memory. If this is undefined, the default is `MOVE_MAX'.
3953 Otherwise, it is the constant value that is the largest value that
3954 `MOVE_MAX' can have at run-time. */
3955 /* #define MAX_MOVE_MAX */
3957 /* A C expression that is nonzero if on this machine the number of bits
3958 actually used for the count of a shift operation is equal to the number of
3959 bits needed to represent the size of the object being shifted. When this
3960 macro is non-zero, the compiler will assume that it is safe to omit a
3961 sign-extend, zero-extend, and certain bitwise `and' instructions that
3962 truncates the count of a shift operation. On machines that have
3963 instructions that act on bitfields at variable positions, which may include
3964 `bit test' instructions, a nonzero `SHIFT_COUNT_TRUNCATED' also enables
3965 deletion of truncations of the values that serve as arguments to bitfield
3968 If both types of instructions truncate the count (for shifts) and position
3969 (for bitfield operations), or if no variable-position bitfield instructions
3970 exist, you should define this macro.
3972 However, on some machines, such as the 80386 and the 680x0, truncation only
3973 applies to shift operations and not the (real or pretended) bitfield
3974 operations. Define `SHIFT_COUNT_TRUNCATED' to be zero on such machines.
3975 Instead, add patterns to the `md' file that include the implied truncation
3976 of the shift instructions.
3978 You need not define this macro if it would always have the value of zero. */
3979 #define SHIFT_COUNT_TRUNCATED 1
3981 /* A C expression which is nonzero if on this machine it is safe to "convert"
3982 an integer of INPREC bits to one of OUTPREC bits (where OUTPREC is smaller
3983 than INPREC) by merely operating on it as if it had only OUTPREC bits.
3985 On many machines, this expression can be 1.
3987 When `TRULY_NOOP_TRUNCATION' returns 1 for a pair of sizes for modes for
3988 which `MODES_TIEABLE_P' is 0, suboptimal code can result. If this is the
3989 case, making `TRULY_NOOP_TRUNCATION' return 0 in such cases may improve
3991 #define TRULY_NOOP_TRUNCATION(OUTPREC, INPREC) 1
3993 /* A C expression describing the value returned by a comparison operator with
3994 an integral mode and stored by a store-flag instruction (`sCOND') when the
3995 condition is true. This description must apply to *all* the `sCOND'
3996 patterns and all the comparison operators whose results have a `MODE_INT'
3999 A value of 1 or -1 means that the instruction implementing the comparison
4000 operator returns exactly 1 or -1 when the comparison is true and 0 when the
4001 comparison is false. Otherwise, the value indicates which bits of the
4002 result are guaranteed to be 1 when the comparison is true. This value is
4003 interpreted in the mode of the comparison operation, which is given by the
4004 mode of the first operand in the `sCOND' pattern. Either the low bit or the
4005 sign bit of `STORE_FLAG_VALUE' be on. Presently, only those bits are used
4008 If `STORE_FLAG_VALUE' is neither 1 or -1, the compiler will generate code
4009 that depends only on the specified bits. It can also replace comparison
4010 operators with equivalent operations if they cause the required bits to be
4011 set, even if the remaining bits are undefined. For example, on a machine
4012 whose comparison operators return an `SImode' value and where
4013 `STORE_FLAG_VALUE' is defined as `0x80000000', saying that just the sign bit
4014 is relevant, the expression
4016 (ne:SI (and:SI X (const_int POWER-OF-2)) (const_int 0))
4020 (ashift:SI X (const_int N))
4022 where N is the appropriate shift count to move the bit being tested into the
4025 There is no way to describe a machine that always sets the low-order bit for
4026 a true value, but does not guarantee the value of any other bits, but we do
4027 not know of any machine that has such an instruction. If you are trying to
4028 port GNU CC to such a machine, include an instruction to perform a
4029 logical-and of the result with 1 in the pattern for the comparison operators
4032 Often, a machine will have multiple instructions that obtain a value from a
4033 comparison (or the condition codes). Here are rules to guide the choice of
4034 value for `STORE_FLAG_VALUE', and hence the instructions to be used:
4036 * Use the shortest sequence that yields a valid definition for
4037 `STORE_FLAG_VALUE'. It is more efficient for the compiler to
4038 "normalize" the value (convert it to, e.g., 1 or 0) than for
4039 the comparison operators to do so because there may be
4040 opportunities to combine the normalization with other
4043 * For equal-length sequences, use a value of 1 or -1, with -1
4044 being slightly preferred on machines with expensive jumps and
4045 1 preferred on other machines.
4047 * As a second choice, choose a value of `0x80000001' if
4048 instructions exist that set both the sign and low-order bits
4049 but do not define the others.
4051 * Otherwise, use a value of `0x80000000'.
4053 Many machines can produce both the value chosen for `STORE_FLAG_VALUE' and
4054 its negation in the same number of instructions. On those machines, you
4055 should also define a pattern for those cases, e.g., one matching
4057 (set A (neg:M (ne:M B C)))
4059 Some machines can also perform `and' or `plus' operations on condition code
4060 values with less instructions than the corresponding `sCOND' insn followed
4061 by `and' or `plus'. On those machines, define the appropriate patterns.
4062 Use the names `incscc' and `decscc', respectively, for the the patterns
4063 which perform `plus' or `minus' operations on condition code values. See
4064 `rs6000.md' for some examples. The GNU Superoptizer can be used to find
4065 such instruction sequences on other machines.
4067 You need not define `STORE_FLAG_VALUE' if the machine has no store-flag
4069 /* #define STORE_FLAG_VALUE */
4071 /* A C expression that gives a non-zero floating point value that is returned
4072 when comparison operators with floating-point results are true. Define this
4073 macro on machine that have comparison operations that return floating-point
4074 values. If there are no such operations, do not define this macro. */
4075 /* #define FLOAT_STORE_FLAG_VALUE */
4077 /* An alias for the machine mode for pointers. On most machines, define this
4078 to be the integer mode corresponding to the width of a hardware pointer;
4079 `SImode' on 32-bit machine or `DImode' on 64-bit machines. On some machines
4080 you must define this to be one of the partial integer modes, such as
4083 The width of `Pmode' must be at least as large as the value of
4084 `POINTER_SIZE'. If it is not equal, you must define the macro
4085 `POINTERS_EXTEND_UNSIGNED' to specify how pointers are extended to `Pmode'. */
4086 #define Pmode HImode
4088 /* An alias for the machine mode used for memory references to functions being
4089 called, in `call' RTL expressions. On most machines this should be
4091 #define FUNCTION_MODE HImode
4093 /* A C expression for the maximum number of instructions above which the
4094 function DECL should not be inlined. DECL is a `FUNCTION_DECL' node.
4096 The default definition of this macro is 64 plus 8 times the number of
4097 arguments that the function accepts. Some people think a larger threshold
4098 should be used on RISC machines. */
4099 /* #define INTEGRATE_THRESHOLD(DECL) */
4101 /* Define this if the preprocessor should ignore `#sccs' directives and print
4104 Defined in svr4.h. */
4105 /* #define SCCS_DIRECTIVE */
4107 /* Define this macro if the system header files support C++ as well as C. This
4108 macro inhibits the usual method of using system header files in C++, which
4109 is to pretend that the file's contents are enclosed in `extern "C" {...}'. */
4110 #define NO_IMPLICIT_EXTERN_C
4112 /* Define this macro if you want to implement any pragmas. If defined, it
4113 should be a C expression to be executed when #pragma is seen. The
4114 argument GETC is a function which will return the next character in the
4115 input stream, or EOF if no characters are left. The argument UNGETC is
4116 a function which will push a character back into the input stream. The
4117 argument NAME is the word following #pragma in the input stream. The input
4118 stream pointer will be pointing just beyond the end of this word. The
4119 expression should return true if it handled the pragma, false otherwise.
4120 The input stream should be left undistrubed if false is returned, otherwise
4121 it should be pointing at the next character after the end of the pragma.
4122 Any characters left between the end of the pragma and the end of the line will
4125 It is generally a bad idea to implement new uses of `#pragma'. The only
4126 reason to define this macro is for compatibility with other compilers that
4127 do support `#pragma' for the sake of any user programs which already use it. */
4128 /* #define HANDLE_PRAGMA(GETC, UNGETC, NAME) handle_pragma (GETC, UNGETC, NAME) */
4130 /* Define this macro to handle System V style pragmas: #pragma pack and
4131 #pragma weak. Note, #pragma weak will only be supported if SUPPORT_WEAK is
4134 Defined in svr4.h. */
4135 #define HANDLE_SYSV_PRAGMA
4137 /* Define this macro if you want to support the Win32 style pragmas
4138 #pragma pack(push,<n>) and #pragma pack(pop). */
4139 /* HANDLE_PRAGMA_PACK_PUSH_POP 1 */
4141 /* Define this macro to control use of the character `$' in identifier names.
4142 The value should be 0, 1, or 2. 0 means `$' is not allowed by default; 1
4143 means it is allowed by default if `-traditional' is used; 2 means it is
4144 allowed by default provided `-ansi' is not used. 1 is the default; there is
4145 no need to define this macro in that case. */
4146 /* #define DOLLARS_IN_IDENTIFIERS */
4148 /* Define this macro if the assembler does not accept the character `$' in
4149 label names. By default constructors and destructors in G++ have `$' in the
4150 identifiers. If this macro is defined, `.' is used instead.
4152 Defined in svr4.h. */
4153 /* #define NO_DOLLAR_IN_LABEL */
4155 /* Define this macro if the assembler does not accept the character `.' in
4156 label names. By default constructors and destructors in G++ have names that
4157 use `.'. If this macro is defined, these names are rewritten to avoid `.'. */
4158 /* #define NO_DOT_IN_LABEL */
4160 /* Define this macro if the target system expects every program's `main'
4161 function to return a standard "success" value by default (if no other value
4162 is explicitly returned).
4164 The definition should be a C statement (sans semicolon) to generate the
4165 appropriate rtl instructions. It is used only when compiling the end of
4167 /* #define DEFAULT_MAIN_RETURN */
4169 /* Define this if the target system supports the function `atexit' from the
4170 ANSI C standard. If this is not defined, and `INIT_SECTION_ASM_OP' is not
4171 defined, a default `exit' function will be provided to support C++.
4173 Defined by svr4.h */
4174 /* #define HAVE_ATEXIT */
4176 /* Define this if your `exit' function needs to do something besides calling an
4177 external function `_cleanup' before terminating with `_exit'. The
4178 `EXIT_BODY' macro is only needed if netiher `HAVE_ATEXIT' nor
4179 `INIT_SECTION_ASM_OP' are defined. */
4180 /* #define EXIT_BODY */
4182 /* Define this macro as a C expression that is nonzero if it is safe for the
4183 delay slot scheduler to place instructions in the delay slot of INSN, even
4184 if they appear to use a resource set or clobbered in INSN. INSN is always a
4185 `jump_insn' or an `insn'; GNU CC knows that every `call_insn' has this
4186 behavior. On machines where some `insn' or `jump_insn' is really a function
4187 call and hence has this behavior, you should define this macro.
4189 You need not define this macro if it would always return zero. */
4190 /* #define INSN_SETS_ARE_DELAYED(INSN) */
4192 /* Define this macro as a C expression that is nonzero if it is safe for the
4193 delay slot scheduler to place instructions in the delay slot of INSN, even
4194 if they appear to set or clobber a resource referenced in INSN. INSN is
4195 always a `jump_insn' or an `insn'. On machines where some `insn' or
4196 `jump_insn' is really a function call and its operands are registers whose
4197 use is actually in the subroutine it calls, you should define this macro.
4198 Doing so allows the delay slot scheduler to move instructions which copy
4199 arguments into the argument registers into the delay slot of INSN.
4201 You need not define this macro if it would always return zero. */
4202 /* #define INSN_REFERENCES_ARE_DELAYED(INSN) */
4204 /* In rare cases, correct code generation requires extra machine dependent
4205 processing between the second jump optimization pass and delayed branch
4206 scheduling. On those machines, define this macro as a C statement to act on
4207 the code starting at INSN. */
4208 /* #define MACHINE_DEPENDENT_REORG(INSN) */
4210 /* Define this macro if in some cases global symbols from one translation unit
4211 may not be bound to undefined symbols in another translation unit without
4212 user intervention. For instance, under Microsoft Windows symbols must be
4213 explicitly imported from shared libraries (DLLs). */
4214 /* #define MULTIPLE_SYMBOL_SPACES */
4216 /* A C expression for the maximum number of instructions to execute via
4217 conditional execution instructions instead of a branch. A value of
4218 BRANCH_COST+1 is the default if the machine does not use
4219 cc0, and 1 if it does use cc0. */
4220 /* #define MAX_CONDITIONAL_EXECUTE */
4222 /* A C statement that adds to tree CLOBBERS a set of STRING_CST trees for any
4223 hard regs the port wishes to automatically clobber for all asms. */
4224 /* #define MD_ASM_CLOBBERS(CLOBBERS) */
4226 /* Indicate how many instructions can be issued at the same time. */
4227 /* #define ISSUE_RATE */
4229 /* A C statement which is executed by the Haifa scheduler at the beginning of
4230 each block of instructions that are to be scheduled. FILE is either a null
4231 pointer, or a stdio stream to write any debug output to. VERBOSE is the
4232 verbose level provided by -fsched-verbose-<n>. */
4233 /* #define MD_SCHED_INIT (FILE, VERBOSE) */
4235 /* A C statement which is executed by the Haifa scheduler after it has scheduled
4236 the ready list to allow the machine description to reorder it (for example to
4237 combine two small instructions together on VLIW machines). FILE is either a
4238 null pointer, or a stdio stream to write any debug output to. VERBOSE is the
4239 verbose level provided by -fsched-verbose-=<n>. READY is a pointer to the
4240 ready list of instructions that are ready to be scheduled. N_READY is the
4241 number of elements in the ready list. The scheduler reads the ready list in
4242 reverse order, starting with READY[N_READY-1] and going to READY[0]. CLOCK
4243 is the timer tick of the scheduler. CAN_ISSUE_MORE is an output parameter that
4244 is set to the number of insns that can issue this clock; normally this is just
4246 /* #define MD_SCHED_REORDER (FILE, VERBOSE, READY, N_READY, CLOCK, CAN_ISSUE_MORE) */
4248 /* A C statement which is executed by the Haifa scheduler after it has scheduled
4249 an insn from the ready list. FILE is either a null pointer, or a stdio stream
4250 to write any debug output to. VERBOSE is the verbose level provided by
4251 -fsched-verbose-<n>. INSN is the instruction that was scheduled. MORE is the
4252 number of instructions that can be issued in the current cycle. This macro
4253 is responsible for updating the value of MORE (typically by (MORE)--). */
4254 /* #define MD_SCHED_VARIABLE_ISSUE (FILE, VERBOSE, INSN, MORE) */
4256 /* Define this to the largest integer machine mode which can be used for
4257 operations other than load, store and copy operations. You need only define
4258 this macro if the target holds values larger than word_mode in general purpose
4259 registers. Most targets should not define this macro. */
4260 /* #define MAX_INTEGER_COMPUTATION_MODE */
4262 /* Define this macro as a C string constant for the linker argument to link in the
4263 system math library, or "" if the target does not have a separate math library.
4264 You need only define this macro if the default of "-lm" is wrong. */
4265 /* #define MATH_LIBRARY */
4267 /* Define the information needed to generate branch and scc insns. This is
4268 stored from the compare operation. Note that we can't use "rtx" here
4269 since it hasn't been defined! */
4271 extern struct rtx_def *xstormy16_compare_op0, *xstormy16_compare_op1;
4273 /* End of xstormy16.h */