1 /* Definitions of target machine for GNU compiler, for MMIX.
2 Copyright (C) 2000, 2001, 2002, 2004, 2005 Free Software Foundation, Inc.
3 Contributed by Hans-Peter Nilsson (hp@bitrange.com)
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 GCC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to
19 the Free Software Foundation, 51 Franklin Street, Fifth Floor,
20 Boston, MA 02110-1301, USA. */
25 /* First, some local helper macros. Note that the "default" value of
26 FIXED_REGISTERS, CALL_USED_REGISTERS, REG_ALLOC_ORDER and
27 REG_CLASS_CONTENTS depend on these values. */
28 #define MMIX_RESERVED_GNU_ARG_0_REGNUM 231
29 #define MMIX_FIRST_ARG_REGNUM \
30 (TARGET_ABI_GNU ? MMIX_RESERVED_GNU_ARG_0_REGNUM : 16)
31 #define MMIX_FIRST_INCOMING_ARG_REGNUM \
32 (TARGET_ABI_GNU ? MMIX_RESERVED_GNU_ARG_0_REGNUM : 0)
33 #define MMIX_MAX_ARGS_IN_REGS 16
35 /* FIXME: This one isn't fully implemented yet. Return values larger than
36 one register are passed by reference in MMIX_STRUCT_VALUE_REGNUM by the
37 caller, except for return values of type "complex". */
38 #define MMIX_MAX_REGS_FOR_VALUE 16
39 #define MMIX_RETURN_VALUE_REGNUM \
40 (TARGET_ABI_GNU ? MMIX_RESERVED_GNU_ARG_0_REGNUM : 15)
41 #define MMIX_OUTGOING_RETURN_VALUE_REGNUM \
42 (TARGET_ABI_GNU ? MMIX_RESERVED_GNU_ARG_0_REGNUM : 0)
43 #define MMIX_STRUCT_VALUE_REGNUM 251
44 #define MMIX_STATIC_CHAIN_REGNUM 252
45 #define MMIX_FRAME_POINTER_REGNUM 253
46 #define MMIX_STACK_POINTER_REGNUM 254
47 #define MMIX_LAST_GENERAL_REGISTER 255
48 #define MMIX_INCOMING_RETURN_ADDRESS_REGNUM MMIX_rJ_REGNUM
49 #define MMIX_HIMULT_REGNUM 258
50 #define MMIX_REMAINDER_REGNUM MMIX_rR_REGNUM
51 #define MMIX_ARG_POINTER_REGNUM 261
52 #define MMIX_rO_REGNUM 262
53 #define MMIX_LAST_STACK_REGISTER_REGNUM 31
55 /* Four registers; "ideally, these registers should be call-clobbered", so
56 just grab a bunch of the common clobbered registers. FIXME: Last
57 registers of return-value should be used, with an error if there's a
58 return-value (that collides in size). */
59 #define MMIX_EH_RETURN_DATA_REGNO_START (MMIX_STRUCT_VALUE_REGNUM - 4)
61 /* Try to keep the definitions from running away on their own. */
62 #if (MMIX_EH_RETURN_DATA_REGNO_START \
63 != MMIX_RESERVED_GNU_ARG_0_REGNUM + MMIX_MAX_ARGS_IN_REGS)
64 #error MMIX register definition inconsistency
67 #if (MMIX_MAX_REGS_FOR_VALUE + MMIX_MAX_ARGS_IN_REGS > 32)
68 #error MMIX parameters and return values bad, more than 32 registers
71 /* This chosen as "a call-clobbered hard register that is otherwise
72 untouched by the epilogue". */
73 #define MMIX_EH_RETURN_STACKADJ_REGNUM MMIX_STATIC_CHAIN_REGNUM
76 # define MMIX_REG_OK_STRICT 1
78 # define MMIX_REG_OK_STRICT 0
81 #define MMIX_FUNCTION_ARG_SIZE(MODE, TYPE) \
82 ((MODE) != BLKmode ? GET_MODE_SIZE (MODE) : int_size_in_bytes (TYPE))
84 /* Declarations for helper variables that are not tied to a particular
86 extern GTY(()) rtx mmix_compare_op0;
87 extern GTY(()) rtx mmix_compare_op1;
89 /* Per-function machine data. This is normally an opaque type just
90 defined and used in the tm.c file, but we need to see the definition in
92 struct machine_function GTY(())
95 int highest_saved_stack_register;
99 /* For these target macros, there is no generic documentation here. You
100 should read `Using and Porting GCC' for that. Only comments specific
101 to the MMIX target are here.
103 There are however references to the specific texinfo node (comments
104 with "Node:"), so there should be little or nothing amiss. Probably
105 the opposite, since we don't have to care about old littering and
106 soon outdated generic comments. */
110 /* User symbols are in the same name-space as built-in symbols, but we
111 don't need the built-in symbols, so remove those and instead apply
112 stricter operand checking. Don't warn when expanding insns. */
113 #define ASM_SPEC "-no-predefined-syms -x"
115 /* Pass on -mset-program-start=N and -mset-data-start=M to the linker.
116 Provide default program start 0x100 unless -mno-set-program-start.
117 Don't do this if linking relocatably, with -r. For a final link,
118 produce mmo, unless ELF is requested or when linking relocatably. */
120 "%{mset-program-start=*:--defsym __.MMIX.start..text=%*}\
121 %{mset-data-start=*:--defsym __.MMIX.start..data=%*}\
122 %{!mset-program-start=*:\
123 %{!mno-set-program-start:\
124 %{!r:--defsym __.MMIX.start..text=0x100}}}\
125 %{!melf:%{!r:-m mmo}}%{melf|r:-m elf64mmix}"
127 /* FIXME: There's no provision for profiling here. */
128 #define STARTFILE_SPEC \
129 "crti%O%s crtbegin%O%s"
131 #define ENDFILE_SPEC "crtend%O%s crtn%O%s"
133 /* Node: Run-time Target */
135 /* Define __LONG_MAX__, since we're advised not to change glimits.h. */
136 #define TARGET_CPU_CPP_BUILTINS() \
139 builtin_define ("__mmix__"); \
140 builtin_define ("__MMIX__"); \
141 if (TARGET_ABI_GNU) \
142 builtin_define ("__MMIX_ABI_GNU__"); \
144 builtin_define ("__MMIX_ABI_MMIXWARE__"); \
148 extern int target_flags;
150 #define TARGET_DEFAULT \
151 (MASK_BRANCH_PREDICT | MASK_BASE_ADDRESSES | MASK_USE_RETURN_INSN)
153 /* Unfortunately, this must not reference anything in "mmix.c". */
154 #define TARGET_VERSION \
155 fprintf (stderr, " (MMIX)")
157 #define OVERRIDE_OPTIONS mmix_override_options ()
159 #define OPTIMIZATION_OPTIONS(LEVEL, SIZE) \
163 flag_regmove = TRUE; \
165 if (SIZE || LEVEL > 1) \
167 flag_omit_frame_pointer = TRUE; \
172 /* This one will have to wait a little bit; right now we can't debug
173 neither with or without a frame-pointer. */
174 /* #define CAN_DEBUG_WITHOUT_FP */
177 /* Node: Per-Function Data */
178 #define INIT_EXPANDERS mmix_init_expanders ()
181 /* Node: Storage Layout */
182 /* I see no bit-field instructions. Anyway, the common order is from low
183 to high, as the power of two, hence little-endian. */
184 #define BITS_BIG_ENDIAN 0
185 #define BYTES_BIG_ENDIAN 1
186 #define WORDS_BIG_ENDIAN 1
187 #define FLOAT_WORDS_BIG_ENDIAN 1
188 #define UNITS_PER_WORD 8
190 /* FIXME: Promotion of modes currently generates slow code, extending
191 before every operation. */
192 /* I'm a little bit undecided about this one. It might be beneficial to
193 promote all operations. */
195 #define PROMOTE_FUNCTION_MODE(MODE, UNSIGNEDP, TYPE) \
197 if (GET_MODE_CLASS (MODE) == MODE_INT \
198 && GET_MODE_SIZE (MODE) < 8) \
201 /* Do the following some time later, \
202 scrutinizing differences. */ \
203 if (0) (UNSIGNEDP) = 0; \
207 /* We need to align everything to 64 bits that can affect the alignment
208 of other types. Since address N is interpreted in MMIX as (N modulo
209 access_size), we must align. */
210 #define PARM_BOUNDARY 64
211 #define STACK_BOUNDARY 64
212 #define FUNCTION_BOUNDARY 32
213 #define BIGGEST_ALIGNMENT 64
215 /* This one is only used in the ADA front end. */
216 #define MINIMUM_ATOMIC_ALIGNMENT 8
218 /* Copied from elfos.h. */
219 #define MAX_OFILE_ALIGNMENT (32768 * 8)
221 #define DATA_ALIGNMENT(TYPE, BASIC_ALIGN) \
222 mmix_data_alignment (TYPE, BASIC_ALIGN)
224 #define CONSTANT_ALIGNMENT(CONSTANT, BASIC_ALIGN) \
225 mmix_constant_alignment (CONSTANT, BASIC_ALIGN)
227 #define LOCAL_ALIGNMENT(TYPE, BASIC_ALIGN) \
228 mmix_local_alignment (TYPE, BASIC_ALIGN)
230 /* Following other ports, this seems to most commonly be the word-size,
231 so let's do that here too. */
232 #define EMPTY_FIELD_BOUNDARY 64
234 /* We chose to have this low solely for similarity with the alpha. It has
235 nothing to do with passing the tests dg/c99-scope-2 and
236 execute/align-1.c. Nothing. Though the tests seem wrong. Padding of
237 the structure is automatically added to get alignment when needed if we
238 set this to just byte-boundary. */
239 #define STRUCTURE_SIZE_BOUNDARY 8
241 /* The lower bits are ignored. */
242 #define STRICT_ALIGNMENT 1
245 /* Node: Type Layout */
247 /* It might seem more natural to have 64-bit ints on a 64-bit machine,
248 but then an occasional MMIX programmer needs to know how to put a lot
249 of __attribute__ stuff to get to the 8, 16 and 32-bit modes rather
250 than the "intuitive" char, short and int types. */
251 #define INT_TYPE_SIZE 32
252 #define SHORT_TYPE_SIZE 16
253 #define LONG_LONG_TYPE_SIZE 64
255 #define FLOAT_TYPE_SIZE 32
256 #define DOUBLE_TYPE_SIZE 64
257 #define LONG_DOUBLE_TYPE_SIZE 64
259 #define DEFAULT_SIGNED_CHAR 1
262 /* Node: Register Basics */
263 /* We tell GCC about all 256 general registers, and we also include
264 rD, rE, rH, rJ, rR and rO (in that order) so we can describe what insns
265 clobber them. We use a faked register for the argument pointer. It is
266 always eliminated towards the frame-pointer or the stack-pointer, never
267 output in assembly. Any fixed register would do for this, like $255,
268 but future debugging is easier when using a separate register. It
269 counts as a global register for pseudorandom reasons. */
270 #define FIRST_PSEUDO_REGISTER 263
272 /* We treat general registers with no assigned purpose as fixed. The
273 stack pointer, $254, is also fixed. Register $255 is referred to as a
274 temporary register in the MMIX papers, and used as such in mmixal, so
275 it should not be used as a stack pointer. We set it to fixed, and use
276 it "manually" at times of despair. */
277 #define FIXED_REGISTERS \
278 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
279 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
280 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
281 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
282 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
283 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
284 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
285 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
286 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
287 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
288 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
289 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
290 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
291 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
292 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
293 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, \
294 1, 1, 0, 0, 0, 1, 1 \
297 /* General registers are fixed and therefore "historically" marked
298 call-used. (FIXME: This has changed). Registers $15..$31 are
299 call-clobbered; we'll put arguments in $16 and up, and we need $15 for
300 the MMIX register-stack "hole". */
301 #define CALL_USED_REGISTERS \
302 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, \
303 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
304 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
305 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
306 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
307 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
308 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
309 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
310 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
311 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
312 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
313 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
314 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
315 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
316 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
317 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, \
318 1, 1, 1, 1, 1, 1, 1 \
321 #define CONDITIONAL_REGISTER_USAGE mmix_conditional_register_usage ()
323 /* No INCOMING_REGNO or OUTGOING_REGNO, since those macros are not usable
324 for MMIX: it doesn't have a fixed register window size. FIXME: Perhaps
325 we should say something about $0..$15 may sometimes be the incoming
326 $16..$31. Those macros need better documentation; it looks like
327 they're just bogus and that FUNCTION_INCOMING_ARG_REGNO_P and
328 FUNCTION_OUTGOING_VALUE should be used where they're used. For the
329 moment, do nothing; things seem to work anyway. */
331 /* Defining LOCAL_REGNO is necessary in presence of prologue/epilogue,
332 else GCC will be confused that those registers aren't saved and
334 #define LOCAL_REGNO(REGNO) mmix_local_regno (REGNO)
336 /* Node: Allocation Order */
338 /* We should allocate registers from 0 to 31 by increasing number, because
339 I think that's what people expect. Beyond that, just use
340 call-clobbered global registers first, then call-clobbered special
341 registers. Last, the fixed registers. */
342 #define MMIX_MMIXWARE_ABI_REG_ALLOC_ORDER \
343 { 0, 1, 2, 3, 4, 5, 6, 7, \
344 8, 9, 10, 11, 12, 13, 14, 15, \
345 16, 17, 18, 19, 20, 21, 22, 23, \
346 24, 25, 26, 27, 28, 29, 30, 31, \
348 252, 251, 250, 249, 248, 247, \
354 32, 33, 34, 35, 36, 37, 38, 39, \
355 40, 41, 42, 43, 44, 45, 46, 47, \
356 48, 49, 50, 51, 52, 53, 54, 55, \
357 56, 57, 58, 59, 60, 61, 62, 63, \
358 64, 65, 66, 67, 68, 69, 70, 71, \
359 72, 73, 74, 75, 76, 77, 78, 79, \
360 80, 81, 82, 83, 84, 85, 86, 87, \
361 88, 89, 90, 91, 92, 93, 94, 95, \
362 96, 97, 98, 99, 100, 101, 102, 103, \
363 104, 105, 106, 107, 108, 109, 110, 111, \
364 112, 113, 114, 115, 116, 117, 118, 119, \
365 120, 121, 122, 123, 124, 125, 126, 127, \
366 128, 129, 130, 131, 132, 133, 134, 135, \
367 136, 137, 138, 139, 140, 141, 142, 143, \
368 144, 145, 146, 147, 148, 149, 150, 151, \
369 152, 153, 154, 155, 156, 157, 158, 159, \
370 160, 161, 162, 163, 164, 165, 166, 167, \
371 168, 169, 170, 171, 172, 173, 174, 175, \
372 176, 177, 178, 179, 180, 181, 182, 183, \
373 184, 185, 186, 187, 188, 189, 190, 191, \
374 192, 193, 194, 195, 196, 197, 198, 199, \
375 200, 201, 202, 203, 204, 205, 206, 207, \
376 208, 209, 210, 211, 212, 213, 214, 215, \
377 216, 217, 218, 219, 220, 221, 222, 223, \
378 224, 225, 226, 227, 228, 229, 230, 231, \
379 232, 233, 234, 235, 236, 237, 238, 239, \
380 240, 241, 242, 243, 244, 245, 246, \
382 254, 255, 256, 257, 261, 262 \
385 /* As a convenience, we put this nearby, for ease of comparison.
386 First, call-clobbered registers in reverse order of assignment as
387 parameters (also the top ones; not because they're parameters, but
390 Second, saved registers that go on the register-stack.
392 Third, special registers rH, rR and rJ. They should not normally be
393 allocated, but since they're call-clobbered, it is cheaper to use one
394 of them than using a call-saved register for a call-clobbered use,
395 assuming it is referenced a very limited number of times. Other global
396 and fixed registers come next; they are never allocated. */
397 #define MMIX_GNU_ABI_REG_ALLOC_ORDER \
398 { 252, 251, 250, 249, 248, 247, 246, \
399 245, 244, 243, 242, 241, 240, 239, 238, \
400 237, 236, 235, 234, 233, 232, 231, \
402 0, 1, 2, 3, 4, 5, 6, 7, \
403 8, 9, 10, 11, 12, 13, 14, 15, \
404 16, 17, 18, 19, 20, 21, 22, 23, \
405 24, 25, 26, 27, 28, 29, 30, 31, \
411 32, 33, 34, 35, 36, 37, 38, 39, \
412 40, 41, 42, 43, 44, 45, 46, 47, \
413 48, 49, 50, 51, 52, 53, 54, 55, \
414 56, 57, 58, 59, 60, 61, 62, 63, \
415 64, 65, 66, 67, 68, 69, 70, 71, \
416 72, 73, 74, 75, 76, 77, 78, 79, \
417 80, 81, 82, 83, 84, 85, 86, 87, \
418 88, 89, 90, 91, 92, 93, 94, 95, \
419 96, 97, 98, 99, 100, 101, 102, 103, \
420 104, 105, 106, 107, 108, 109, 110, 111, \
421 112, 113, 114, 115, 116, 117, 118, 119, \
422 120, 121, 122, 123, 124, 125, 126, 127, \
423 128, 129, 130, 131, 132, 133, 134, 135, \
424 136, 137, 138, 139, 140, 141, 142, 143, \
425 144, 145, 146, 147, 148, 149, 150, 151, \
426 152, 153, 154, 155, 156, 157, 158, 159, \
427 160, 161, 162, 163, 164, 165, 166, 167, \
428 168, 169, 170, 171, 172, 173, 174, 175, \
429 176, 177, 178, 179, 180, 181, 182, 183, \
430 184, 185, 186, 187, 188, 189, 190, 191, \
431 192, 193, 194, 195, 196, 197, 198, 199, \
432 200, 201, 202, 203, 204, 205, 206, 207, \
433 208, 209, 210, 211, 212, 213, 214, 215, \
434 216, 217, 218, 219, 220, 221, 222, 223, \
435 224, 225, 226, 227, 228, 229, 230, \
437 254, 255, 256, 257, 261, 262 \
440 /* The default one. */
441 #define REG_ALLOC_ORDER MMIX_MMIXWARE_ABI_REG_ALLOC_ORDER
443 /* Node: Values in Registers */
445 #define HARD_REGNO_NREGS(REGNO, MODE) \
446 ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) \
449 #define HARD_REGNO_MODE_OK(REGNO, MODE) 1
451 /* Note that no register can really be accessed in single-float mode, so
452 we *can* say 1 here. FIXME: Will TRT happen for single-float, or do
453 we have to punt to libgcc1.asm? */
454 #define MODES_TIEABLE_P(MODE1, MODE2) 1
457 /* Node: Leaf Functions */
461 /* Node: Register Classes */
465 NO_REGS, GENERAL_REGS, REMAINDER_REG, HIMULT_REG,
466 SYSTEM_REGS, ALL_REGS, LIM_REG_CLASSES
469 #define N_REG_CLASSES (int) LIM_REG_CLASSES
471 #define REG_CLASS_NAMES \
472 {"NO_REGS", "GENERAL_REGS", "REMAINDER_REG", "HIMULT_REG", \
473 "SYSTEM_REGS", "ALL_REGS"}
475 /* Note that the contents of each item is always 32 bits. */
476 #define REG_CLASS_CONTENTS \
477 {{0, 0, 0, 0, 0, 0, 0, 0, 0}, \
478 {~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, 0x20}, \
479 {0, 0, 0, 0, 0, 0, 0, 0, 0x10}, \
480 {0, 0, 0, 0, 0, 0, 0, 0, 4}, \
481 {0, 0, 0, 0, 0, 0, 0, 0, 0x7f}, \
482 {~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, 0x7f}}
484 #define REGNO_REG_CLASS(REGNO) \
485 ((REGNO) <= MMIX_LAST_GENERAL_REGISTER \
486 || (REGNO) == MMIX_ARG_POINTER_REGNUM \
488 : (REGNO) == MMIX_REMAINDER_REGNUM ? REMAINDER_REG \
489 : (REGNO) == MMIX_HIMULT_REGNUM ? HIMULT_REG : SYSTEM_REGS)
491 #define BASE_REG_CLASS GENERAL_REGS
493 #define INDEX_REG_CLASS GENERAL_REGS
495 #define REG_CLASS_FROM_LETTER(CHAR) \
496 ((CHAR) == 'x' ? SYSTEM_REGS \
497 : (CHAR) == 'y' ? REMAINDER_REG \
498 : (CHAR) == 'z' ? HIMULT_REG : NO_REGS)
500 #define REGNO_OK_FOR_BASE_P(REGNO) \
501 ((REGNO) <= MMIX_LAST_GENERAL_REGISTER \
502 || (REGNO) == MMIX_ARG_POINTER_REGNUM \
503 || (reg_renumber[REGNO] > 0 \
504 && reg_renumber[REGNO] <= MMIX_LAST_GENERAL_REGISTER))
506 #define REGNO_OK_FOR_INDEX_P(REGNO) REGNO_OK_FOR_BASE_P (REGNO)
508 #define PREFERRED_RELOAD_CLASS(X, CLASS) \
509 mmix_preferred_reload_class (X, CLASS)
511 #define PREFERRED_OUTPUT_RELOAD_CLASS(X, CLASS) \
512 mmix_preferred_output_reload_class (X, CLASS)
514 #define SECONDARY_INPUT_RELOAD_CLASS(CLASS, MODE, X) \
515 mmix_secondary_reload_class (CLASS, MODE, X, 1)
517 #define SECONDARY_OUTPUT_RELOAD_CLASS(CLASS, MODE, X) \
518 mmix_secondary_reload_class (CLASS, MODE, X, 0)
520 #define CLASS_MAX_NREGS(CLASS, MODE) HARD_REGNO_NREGS (CLASS, MODE)
522 #define CONST_OK_FOR_LETTER_P(VALUE, C) \
523 mmix_const_ok_for_letter_p (VALUE, C)
525 #define EXTRA_CONSTRAINT(VALUE, C) \
526 mmix_extra_constraint (VALUE, C, MMIX_REG_OK_STRICT)
528 /* Do we need anything serious here? Yes, any FLOT constant. */
529 #define CONST_DOUBLE_OK_FOR_LETTER_P(VALUE, C) \
530 mmix_const_double_ok_for_letter_p (VALUE, C)
533 /* Node: Frame Layout */
535 #define STACK_GROWS_DOWNWARD
536 #define FRAME_GROWS_DOWNWARD 1
538 #define STARTING_FRAME_OFFSET \
539 mmix_starting_frame_offset ()
541 #define FIRST_PARM_OFFSET(FUNDECL) 0
543 #define DYNAMIC_CHAIN_ADDRESS(FRAMEADDR) \
544 mmix_dynamic_chain_address (FRAMEADDR)
546 /* FIXME: It seems RETURN_ADDR_OFFSET is undocumented. */
548 #define SETUP_FRAME_ADDRESSES() \
549 mmix_setup_frame_addresses ()
551 #define RETURN_ADDR_RTX(COUNT, FRAME) \
552 mmix_return_addr_rtx (COUNT, FRAME)
554 /* It's in rJ before we store it somewhere. */
555 #define INCOMING_RETURN_ADDR_RTX \
556 gen_rtx_REG (Pmode, MMIX_INCOMING_RETURN_ADDRESS_REGNUM)
558 /* FIXME: This does not seem properly documented or cross-indexed.
559 Nowhere except in the code does it say it *has* to be in the range
560 0..255, or else it will be truncated. That goes for the default too. */
561 #define DWARF_FRAME_RETURN_COLUMN \
562 DWARF_FRAME_REGNUM (MMIX_INCOMING_RETURN_ADDRESS_REGNUM)
564 /* No return address is stored there. */
565 #define INCOMING_FRAME_SP_OFFSET 0
567 /* Node: Stack Checking */
571 /* Node: Exception Handling */
573 #define EH_RETURN_DATA_REGNO(N) \
574 mmix_eh_return_data_regno (N)
576 #define EH_RETURN_STACKADJ_RTX \
577 mmix_eh_return_stackadj_rtx ()
579 #define EH_RETURN_HANDLER_RTX \
580 mmix_eh_return_handler_rtx ()
582 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL) \
583 mmix_asm_preferred_eh_data_format (CODE, GLOBAL)
585 /* Node: Frame Registers */
586 #define STACK_POINTER_REGNUM MMIX_STACK_POINTER_REGNUM
588 /* Perhaps we can use HARD_FRAME_POINTER_REGNUM and decide later on
589 what register we want to use. */
590 #define FRAME_POINTER_REGNUM MMIX_FRAME_POINTER_REGNUM
591 #define ARG_POINTER_REGNUM MMIX_ARG_POINTER_REGNUM
593 #define STATIC_CHAIN_REGNUM MMIX_STATIC_CHAIN_REGNUM
596 /* Node: Elimination */
597 /* FIXME: Is this requirement built-in? Anyway, we should try to get rid
598 of it; we can deduce the value. */
599 #define FRAME_POINTER_REQUIRED current_function_has_nonlocal_label
601 /* The frame-pointer is stored in a location that either counts to the
602 offset of incoming parameters, or that counts to the offset of the
603 frame, so we can't use a single offset. We therefore eliminate those
605 #define ELIMINABLE_REGS \
606 {{ARG_POINTER_REGNUM, STACK_POINTER_REGNUM}, \
607 {ARG_POINTER_REGNUM, FRAME_POINTER_REGNUM}, \
608 {FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM}}
610 /* We need not worry about when the frame-pointer is required for other
611 reasons; GCC takes care of those cases. */
612 #define CAN_ELIMINATE(FROM, TO) 1
614 #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET) \
615 (OFFSET) = mmix_initial_elimination_offset (FROM, TO)
618 /* Node: Stack Arguments */
620 #define ACCUMULATE_OUTGOING_ARGS 1
622 #define RETURN_POPS_ARGS(FUNDECL, FUNTYPE, STACKSIZE) 0
625 /* Node: Register Arguments */
626 #define FUNCTION_ARG(CUM, MODE, TYPE, NAMED) \
627 mmix_function_arg (&(CUM), MODE, TYPE, NAMED, 0)
629 #define FUNCTION_INCOMING_ARG(CUM, MODE, TYPE, NAMED) \
630 mmix_function_arg (&(CUM), MODE, TYPE, NAMED, 1)
632 typedef struct { int regs; int lib; } CUMULATIVE_ARGS;
634 #define INIT_CUMULATIVE_ARGS(CUM, FNTYPE, LIBNAME, INDIRECT, N_NAMED_ARGS) \
635 ((CUM).regs = 0, (CUM).lib = ((LIBNAME) != 0))
637 #define FUNCTION_ARG_ADVANCE(CUM, MODE, TYPE, NAMED) \
639 = ((targetm.calls.must_pass_in_stack (MODE, TYPE)) \
640 || (MMIX_FUNCTION_ARG_SIZE (MODE, TYPE) > 8 \
641 && !TARGET_LIBFUNC && !(CUM).lib)) \
642 ? (MMIX_MAX_ARGS_IN_REGS) + 1 \
643 : (CUM).regs + (7 + (MMIX_FUNCTION_ARG_SIZE (MODE, TYPE))) / 8)
645 #define FUNCTION_ARG_REGNO_P(REGNO) \
646 mmix_function_arg_regno_p (REGNO, 0)
648 #define FUNCTION_INCOMING_ARG_REGNO_P(REGNO) \
649 mmix_function_arg_regno_p (REGNO, 1)
652 /* Node: Register Arguments */
654 #define FUNCTION_VALUE(VALTYPE, FUNC) \
655 gen_rtx_REG (TYPE_MODE (VALTYPE), MMIX_RETURN_VALUE_REGNUM)
657 /* This needs to take care of the register hole for complex return values. */
658 #define FUNCTION_OUTGOING_VALUE(VALTYPE, FUNC) \
659 mmix_function_outgoing_value (VALTYPE, FUNC)
661 #define LIBCALL_VALUE(MODE) \
662 gen_rtx_REG (MODE, MMIX_RETURN_VALUE_REGNUM)
664 #define FUNCTION_VALUE_REGNO_P(REGNO) \
665 mmix_function_value_regno_p (REGNO)
668 /* Node: Caller Saves */
672 /* Node: Function Entry */
674 /* See mmix.c for TARGET_ASM_FUNCTION_PROLOGUE and
675 TARGET_ASM_FUNCTION_EPILOGUE. */
677 /* We need to say that the epilogue uses the return address, so the
678 initial-value machinery restores it. FIXME: Some targets
679 conditionalize on "reload_completed &&". Investigate difference.
680 FIXME: Not needed if nonlocal_goto_stack_level. */
681 #define EPILOGUE_USES(REGNO) \
682 ((REGNO) == MMIX_INCOMING_RETURN_ADDRESS_REGNUM)
684 /* Node: Profiling */
685 #define FUNCTION_PROFILER(FILE, LABELNO) \
686 mmix_function_profiler (FILE, LABELNO)
688 /* Node: Trampolines */
690 #define TRAMPOLINE_TEMPLATE(FILE) \
691 mmix_trampoline_template (FILE)
693 #define TRAMPOLINE_SIZE mmix_trampoline_size
694 #define INITIALIZE_TRAMPOLINE(ADDR, FNADDR, STATIC_CHAIN) \
695 mmix_initialize_trampoline (ADDR, FNADDR, STATIC_CHAIN)
698 /* Node: Addressing Modes */
700 #define CONSTANT_ADDRESS_P(X) \
701 mmix_constant_address_p (X)
703 #define MAX_REGS_PER_ADDRESS 2
705 #define GO_IF_LEGITIMATE_ADDRESS(MODE, X, LABEL) \
706 if (mmix_legitimate_address (MODE, X, MMIX_REG_OK_STRICT)) \
709 #ifndef REG_OK_STRICT
710 # define REG_OK_FOR_BASE_P(X) \
711 (REGNO (X) <= MMIX_LAST_GENERAL_REGISTER \
712 || REGNO (X) == MMIX_ARG_POINTER_REGNUM \
713 || REGNO (X) >= FIRST_PSEUDO_REGISTER)
715 # define REG_OK_FOR_BASE_P(X) REGNO_OK_FOR_BASE_P (REGNO (X))
716 #endif /* REG_OK_STRICT */
718 #define REG_OK_FOR_INDEX_P(X) REG_OK_FOR_BASE_P (X)
720 #define GO_IF_MODE_DEPENDENT_ADDRESS(ADDR, LABEL)
722 #define LEGITIMATE_CONSTANT_P(X) \
723 mmix_legitimate_constant_p (X)
726 /* Node: Condition Code */
728 #define SELECT_CC_MODE(OP, X, Y) \
729 mmix_select_cc_mode (OP, X, Y)
731 /* A definition of CANONICALIZE_COMPARISON that changed LE and GT
732 comparisons with -1 to LT and GE respectively, and LT, LTU, GE or GEU
733 comparisons with 256 to 255 and LE, LEU, GT and GTU has been
734 ineffective; the code path for performing the changes did not trig for
735 neither the GCC testsuite nor ghostscript-6.52 nor Knuth's mmix.tar.gz
736 itself (core GCC functionality supposedly handling it) with sources
739 #define REVERSIBLE_CC_MODE(MODE) \
740 mmix_reversible_cc_mode (MODE)
745 /* The special registers can only move to and from general regs, and we
746 need to check that their constraints match, so say 3 for them. */
747 /* WARNING: gcc-2.7.2.2 i686-pc-linux-gnulibc1 (as shipped with RH 4.2)
748 miscompiles reload1.c:reload_cse_simplify_set; a call to
749 reload_cse_regno_equal_p is missing when checking if a substitution of
750 a register setting is valid if this is defined to just the expression
751 in mmix_register_move_cost.
753 Symptom: a (all?) register setting is optimized away for e.g.
754 "char *p1(char *p) { return p+1; }" and the value of register zero ($0)
757 We can workaround by making this a function call - unknown if this
758 causes dire speed effects. */
759 #define REGISTER_MOVE_COST(MODE, FROM, TO) \
760 mmix_register_move_cost (MODE, FROM, TO)
762 #define SLOW_BYTE_ACCESS 0
767 /* This must be a constant string, since it's used in crtstuff.c. */
768 #define TEXT_SECTION_ASM_OP \
769 "\t.text ! mmixal:= 9H LOC 8B"
771 /* FIXME: Not documented. */
772 #define DATA_SECTION_ASM_OP \
773 mmix_data_section_asm_op ()
775 #define READONLY_DATA_SECTION_ASM_OP "\t.section\t.rodata"
781 /* Node: File Framework */
783 /* While any other punctuation character but ";" would do, we prefer "%"
784 or "!"; "!" is an unary operator and so will not be mistakenly included
785 in correctly formed expressions. The hash character adds mass; catches
786 the eye. We can't have it as a comment char by itself, since it's a
787 hex-number prefix. */
788 #define ASM_COMMENT_START "!#"
790 /* These aren't currently functional. We just keep them as markers. */
791 #define ASM_APP_ON "%APP\n"
792 #define ASM_APP_OFF "%NO_APP\n"
794 #define ASM_OUTPUT_SOURCE_FILENAME(STREAM, NAME) \
795 mmix_asm_output_source_filename (STREAM, NAME)
797 #define OUTPUT_QUOTED_STRING(STREAM, STRING) \
798 mmix_output_quoted_string (STREAM, STRING, strlen (STRING))
800 #define TARGET_ASM_NAMED_SECTION default_elf_asm_named_section
802 /* Node: Data Output */
804 #define ASM_OUTPUT_ASCII(STREAM, PTR, LEN) \
805 mmix_asm_output_ascii (STREAM, PTR, LEN)
807 /* Node: Uninitialized Data */
809 #define ASM_OUTPUT_ALIGNED_COMMON(ST, N, S, A) \
810 mmix_asm_output_aligned_common (ST, N, S, A)
812 #define ASM_OUTPUT_ALIGNED_LOCAL(ST, N, S, A) \
813 mmix_asm_output_aligned_local (ST, N, S, A)
816 /* Node: Label Output */
818 #define ASM_OUTPUT_LABEL(STREAM, NAME) \
819 mmix_asm_output_label (STREAM, NAME)
821 #define ASM_OUTPUT_INTERNAL_LABEL(STREAM, NAME) \
822 mmix_asm_output_internal_label (STREAM, NAME)
824 #define ASM_DECLARE_REGISTER_GLOBAL(STREAM, DECL, REGNO, NAME) \
825 mmix_asm_declare_register_global (STREAM, DECL, REGNO, NAME)
827 #define GLOBAL_ASM_OP "\t.global "
829 #define ASM_WEAKEN_LABEL(STREAM, NAME) \
830 mmix_asm_weaken_label (STREAM, NAME)
832 #define MAKE_DECL_ONE_ONLY(DECL) \
833 mmix_make_decl_one_only (DECL)
835 #define ASM_OUTPUT_LABELREF(STREAM, NAME) \
836 mmix_asm_output_labelref (STREAM, NAME)
838 /* We insert a ":" to disambiguate against user symbols like L5. */
839 #define ASM_GENERATE_INTERNAL_LABEL(LABEL, PREFIX, NUM) \
840 sprintf (LABEL, "*%s:%ld", PREFIX, (long)(NUM))
842 /* Insert "::"; these are rarer than internal labels. FIXME: Make sure no
843 ":" is seen in the object file; we don't really want that mmixal
844 feature visible there. We don't want the default, which uses a dot;
845 that'd be incompatible with mmixal. */
846 #define ASM_PN_FORMAT "%s::%lu"
848 #define ASM_OUTPUT_DEF(STREAM, NAME, VALUE) \
849 mmix_asm_output_def (STREAM, NAME, VALUE)
851 /* Node: Macros for Initialization */
852 /* We're compiling to ELF and linking to MMO; fundamental ELF features
853 that GCC depend on are there. */
855 /* These must be constant strings, since they're used in crtstuff.c. */
856 #define INIT_SECTION_ASM_OP "\t.section .init,\"ax\" ! mmixal-incompatible"
858 #define FINI_SECTION_ASM_OP "\t.section .fini,\"ax\" ! mmixal-incompatible"
860 #define OBJECT_FORMAT_ELF
863 /* Node: Instruction Output */
865 /* The non-$ register names must be prefixed with ":", since they're
866 affected by PREFIX. We provide the non-colon names as additional
868 #define REGISTER_NAMES \
869 {"$0", "$1", "$2", "$3", "$4", "$5", "$6", "$7", \
870 "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15", \
871 "$16", "$17", "$18", "$19", "$20", "$21", "$22", "$23", \
872 "$24", "$25", "$26", "$27", "$28", "$29", "$30", "$31", \
873 "$32", "$33", "$34", "$35", "$36", "$37", "$38", "$39", \
874 "$40", "$41", "$42", "$43", "$44", "$45", "$46", "$47", \
875 "$48", "$49", "$50", "$51", "$52", "$53", "$54", "$55", \
876 "$56", "$57", "$58", "$59", "$60", "$61", "$62", "$63", \
877 "$64", "$65", "$66", "$67", "$68", "$69", "$70", "$71", \
878 "$72", "$73", "$74", "$75", "$76", "$77", "$78", "$79", \
879 "$80", "$81", "$82", "$83", "$84", "$85", "$86", "$87", \
880 "$88", "$89", "$90", "$91", "$92", "$93", "$94", "$95", \
881 "$96", "$97", "$98", "$99", "$100", "$101", "$102", "$103", \
882 "$104", "$105", "$106", "$107", "$108", "$109", "$110", "$111", \
883 "$112", "$113", "$114", "$115", "$116", "$117", "$118", "$119", \
884 "$120", "$121", "$122", "$123", "$124", "$125", "$126", "$127", \
885 "$128", "$129", "$130", "$131", "$132", "$133", "$134", "$135", \
886 "$136", "$137", "$138", "$139", "$140", "$141", "$142", "$143", \
887 "$144", "$145", "$146", "$147", "$148", "$149", "$150", "$151", \
888 "$152", "$153", "$154", "$155", "$156", "$157", "$158", "$159", \
889 "$160", "$161", "$162", "$163", "$164", "$165", "$166", "$167", \
890 "$168", "$169", "$170", "$171", "$172", "$173", "$174", "$175", \
891 "$176", "$177", "$178", "$179", "$180", "$181", "$182", "$183", \
892 "$184", "$185", "$186", "$187", "$188", "$189", "$190", "$191", \
893 "$192", "$193", "$194", "$195", "$196", "$197", "$198", "$199", \
894 "$200", "$201", "$202", "$203", "$204", "$205", "$206", "$207", \
895 "$208", "$209", "$210", "$211", "$212", "$213", "$214", "$215", \
896 "$216", "$217", "$218", "$219", "$220", "$221", "$222", "$223", \
897 "$224", "$225", "$226", "$227", "$228", "$229", "$230", "$231", \
898 "$232", "$233", "$234", "$235", "$236", "$237", "$238", "$239", \
899 "$240", "$241", "$242", "$243", "$244", "$245", "$246", "$247", \
900 "$248", "$249", "$250", "$251", "$252", "$253", "$254", "$255", \
901 ":rD", ":rE", ":rH", ":rJ", ":rR", "ap_!BAD!", ":rO"}
903 #define ADDITIONAL_REGISTER_NAMES \
904 {{"sp", 254}, {":sp", 254}, {"rD", 256}, {"rE", 257}, \
905 {"rH", 258}, {"rJ", MMIX_rJ_REGNUM}, {"rO", MMIX_rO_REGNUM}}
907 #define PRINT_OPERAND(STREAM, X, CODE) \
908 mmix_print_operand (STREAM, X, CODE)
910 #define PRINT_OPERAND_PUNCT_VALID_P(CODE) \
911 mmix_print_operand_punct_valid_p (CODE)
913 #define PRINT_OPERAND_ADDRESS(STREAM, X) \
914 mmix_print_operand_address (STREAM, X)
916 #define ASM_OUTPUT_REG_PUSH(STREAM, REGNO) \
917 mmix_asm_output_reg_push (STREAM, REGNO)
919 #define ASM_OUTPUT_REG_POP(STREAM, REGNO) \
920 mmix_asm_output_reg_pop (STREAM, REGNO)
923 /* Node: Dispatch Tables */
925 /* We define both types, since SImode is the better, but DImode the only
926 possible for mmixal so that's the one actually used. */
927 #define ASM_OUTPUT_ADDR_DIFF_ELT(STREAM, BODY, VALUE, REL) \
928 mmix_asm_output_addr_diff_elt (STREAM, BODY, VALUE, REL)
930 #define ASM_OUTPUT_ADDR_VEC_ELT(STREAM, VALUE) \
931 mmix_asm_output_addr_vec_elt (STREAM, VALUE)
934 /* Node: Exception Region Output */
937 /* Node: Alignment Output */
939 #define ASM_OUTPUT_SKIP(STREAM, NBYTES) \
940 mmix_asm_output_skip (STREAM, NBYTES)
942 #define ASM_OUTPUT_ALIGN(STREAM, POWER) \
943 mmix_asm_output_align (STREAM, POWER)
946 /* Node: All Debuggers */
948 #define DBX_REGISTER_NUMBER(REGNO) \
949 mmix_dbx_register_number (REGNO)
952 /* Node: DBX Options */
954 /* Node: DBX Hooks */
956 /* Node: File Names and DBX */
960 /* Node: SDB and DWARF */
961 #define DWARF2_DEBUGGING_INFO 1
962 #define DWARF2_ASM_LINE_DEBUG_INFO 1
966 /* There's no way to get a PC-relative offset into tables for SImode, so
967 for the moment we have absolute entries in DImode.
968 When we're going ELF, these should be SImode and 1. */
969 #define CASE_VECTOR_MODE DImode
970 #define CASE_VECTOR_PC_RELATIVE 0
972 #define WORD_REGISTER_OPERATIONS
974 /* We have a choice, which makes this yet another parameter to tweak. The
975 gut feeling is currently that SIGN_EXTEND wins; "int" is more frequent
976 than "unsigned int", and we have signed characters. FIXME: measure. */
977 #define LOAD_EXTEND_OP(MODE) (TARGET_ZERO_EXTEND ? ZERO_EXTEND : SIGN_EXTEND)
981 #define TRULY_NOOP_TRUNCATION(OUTPREC, INPREC) 1
983 /* ??? MMIX allows a choice of STORE_FLAG_VALUE. Revisit later,
984 we don't have scc expanders yet. */
988 #define FUNCTION_MODE QImode
990 #define NO_IMPLICIT_EXTERN_C
992 #define HANDLE_SYSV_PRAGMA 1
994 /* These are checked. */
995 #define DOLLARS_IN_IDENTIFIERS 0
996 #define NO_DOLLAR_IN_LABEL
997 #define NO_DOT_IN_LABEL
999 #endif /* GCC_MMIX_H */
1002 * eval: (c-set-style "gnu")
1003 * indent-tabs-mode: t