1 /* Definitions of target machine for GNU compiler,
2 for ATMEL AVR at90s8515, ATmega103/103L, ATmega603/603L microcontrollers.
3 Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007,
5 Free Software Foundation, Inc.
6 Contributed by Denis Chertykov (chertykov@gmail.com)
8 This file is part of GCC.
10 GCC is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 3, or (at your option)
15 GCC is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with GCC; see the file COPYING3. If not see
22 <http://www.gnu.org/licenses/>. */
24 /* Names to predefine in the preprocessor for this target machine. */
30 /* Core have 'MUL*' instructions. */
33 /* Core have 'CALL' and 'JMP' instructions. */
36 /* Core have 'MOVW' and 'LPM Rx,Z' instructions. */
39 /* Core have 'ELPM' instructions. */
42 /* Core have 'ELPM Rx,Z' instructions. */
45 /* Core have 'EICALL' and 'EIJMP' instructions. */
46 int have_eijmp_eicall;
48 /* Reserved for xmega architecture. */
51 /* Reserved for xmega architecture. */
54 /* Default start of data section address for architecture. */
55 int default_data_section_start;
57 const char *const macro;
59 /* Architecture name. */
60 const char *const arch_name;
63 /* These names are used as the index into the avr_arch_types[] table
83 const char *const name;
85 /* Index in avr_arch_types[]. */
88 /* Must lie outside user's namespace. NULL == no macro. */
89 const char *const macro;
91 /* Stack pointer have 8 bits width. */
94 /* Some AVR devices have a core erratum when skipping a 2-word instruction.
95 Skip instructions are: SBRC, SBRS, SBIC, SBIS, CPSE.
96 Problems will occur with return address is IRQ executes during the
99 A support ticket from Atmel returned the following information:
101 Subject: (ATTicket:644469) On AVR skip-bug core Erratum
102 From: avr@atmel.com Date: 2011-07-27
103 (Please keep the subject when replying to this mail)
105 This errata exists only in AT90S8515 and ATmega103 devices.
107 For information please refer the following respective errata links
108 http://www.atmel.com/dyn/resources/prod_documents/doc2494.pdf
109 http://www.atmel.com/dyn/resources/prod_documents/doc1436.pdf */
111 /* Core Erratum: Must not skip 2-word instruction. */
114 /* Start of data section. */
115 int data_section_start;
117 /* Name of device library. */
118 const char *const library_name;
121 /* Preprocessor macros to define depending on MCU type. */
122 extern const char *avr_extra_arch_macro;
123 extern const struct base_arch_s *avr_current_arch;
124 extern const struct mcu_type_s *avr_current_device;
125 extern const struct mcu_type_s avr_mcu_types[];
126 extern const struct base_arch_s avr_arch_types[];
128 #define TARGET_CPU_CPP_BUILTINS() avr_cpu_cpp_builtins (pfile)
130 #define AVR_HAVE_JMP_CALL (avr_current_arch->have_jmp_call && !TARGET_SHORT_CALLS)
131 #define AVR_HAVE_MUL (avr_current_arch->have_mul)
132 #define AVR_HAVE_MOVW (avr_current_arch->have_movw_lpmx)
133 #define AVR_HAVE_LPMX (avr_current_arch->have_movw_lpmx)
134 #define AVR_HAVE_RAMPZ (avr_current_arch->have_elpm)
135 #define AVR_HAVE_EIJMP_EICALL (avr_current_arch->have_eijmp_eicall)
136 #define AVR_HAVE_8BIT_SP (avr_current_device->short_sp || TARGET_TINY_STACK)
138 #define AVR_2_BYTE_PC (!AVR_HAVE_EIJMP_EICALL)
139 #define AVR_3_BYTE_PC (AVR_HAVE_EIJMP_EICALL)
141 #define BITS_BIG_ENDIAN 0
142 #define BYTES_BIG_ENDIAN 0
143 #define WORDS_BIG_ENDIAN 0
146 /* This is to get correct SI and DI modes in libgcc2.c (32 and 64 bits). */
147 #define UNITS_PER_WORD 4
149 /* Width of a word, in units (bytes). */
150 #define UNITS_PER_WORD 1
153 #define POINTER_SIZE 16
156 /* Maximum sized of reasonable data type
157 DImode or Dfmode ... */
158 #define MAX_FIXED_MODE_SIZE 32
160 #define PARM_BOUNDARY 8
162 #define FUNCTION_BOUNDARY 8
164 #define EMPTY_FIELD_BOUNDARY 8
166 /* No data type wants to be aligned rounder than this. */
167 #define BIGGEST_ALIGNMENT 8
169 #define TARGET_VTABLE_ENTRY_ALIGN 8
171 #define STRICT_ALIGNMENT 0
173 #define INT_TYPE_SIZE (TARGET_INT8 ? 8 : 16)
174 #define SHORT_TYPE_SIZE (INT_TYPE_SIZE == 8 ? INT_TYPE_SIZE : 16)
175 #define LONG_TYPE_SIZE (INT_TYPE_SIZE == 8 ? 16 : 32)
176 #define LONG_LONG_TYPE_SIZE (INT_TYPE_SIZE == 8 ? 32 : 64)
177 #define FLOAT_TYPE_SIZE 32
178 #define DOUBLE_TYPE_SIZE 32
179 #define LONG_DOUBLE_TYPE_SIZE 32
181 #define DEFAULT_SIGNED_CHAR 1
183 #define SIZE_TYPE (INT_TYPE_SIZE == 8 ? "long unsigned int" : "unsigned int")
184 #define PTRDIFF_TYPE (INT_TYPE_SIZE == 8 ? "long int" :"int")
186 #define WCHAR_TYPE_SIZE 16
188 #define FIRST_PSEUDO_REGISTER 36
190 #define FIXED_REGISTERS {\
208 1,1 /* arg pointer */ }
210 #define CALL_USED_REGISTERS { \
228 1,1 /* arg pointer */ }
230 #define REG_ALLOC_ORDER { \
238 17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2, \
243 #define ADJUST_REG_ALLOC_ORDER order_regs_for_local_alloc ()
246 #define HARD_REGNO_NREGS(REGNO, MODE) ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD)
248 #define HARD_REGNO_MODE_OK(REGNO, MODE) avr_hard_regno_mode_ok(REGNO, MODE)
250 #define MODES_TIEABLE_P(MODE1, MODE2) 1
255 POINTER_X_REGS, /* r26 - r27 */
256 POINTER_Y_REGS, /* r28 - r29 */
257 POINTER_Z_REGS, /* r30 - r31 */
258 STACK_REG, /* STACK */
259 BASE_POINTER_REGS, /* r28 - r31 */
260 POINTER_REGS, /* r26 - r31 */
261 ADDW_REGS, /* r24 - r31 */
262 SIMPLE_LD_REGS, /* r16 - r23 */
263 LD_REGS, /* r16 - r31 */
264 NO_LD_REGS, /* r0 - r15 */
265 GENERAL_REGS, /* r0 - r31 */
266 ALL_REGS, LIM_REG_CLASSES
270 #define N_REG_CLASSES (int)LIM_REG_CLASSES
272 #define REG_CLASS_NAMES { \
275 "POINTER_X_REGS", /* r26 - r27 */ \
276 "POINTER_Y_REGS", /* r28 - r29 */ \
277 "POINTER_Z_REGS", /* r30 - r31 */ \
278 "STACK_REG", /* STACK */ \
279 "BASE_POINTER_REGS", /* r28 - r31 */ \
280 "POINTER_REGS", /* r26 - r31 */ \
281 "ADDW_REGS", /* r24 - r31 */ \
282 "SIMPLE_LD_REGS", /* r16 - r23 */ \
283 "LD_REGS", /* r16 - r31 */ \
284 "NO_LD_REGS", /* r0 - r15 */ \
285 "GENERAL_REGS", /* r0 - r31 */ \
288 #define REG_CLASS_CONTENTS { \
289 {0x00000000,0x00000000}, /* NO_REGS */ \
290 {0x00000001,0x00000000}, /* R0_REG */ \
291 {3 << REG_X,0x00000000}, /* POINTER_X_REGS, r26 - r27 */ \
292 {3 << REG_Y,0x00000000}, /* POINTER_Y_REGS, r28 - r29 */ \
293 {3 << REG_Z,0x00000000}, /* POINTER_Z_REGS, r30 - r31 */ \
294 {0x00000000,0x00000003}, /* STACK_REG, STACK */ \
295 {(3 << REG_Y) | (3 << REG_Z), \
296 0x00000000}, /* BASE_POINTER_REGS, r28 - r31 */ \
297 {(3 << REG_X) | (3 << REG_Y) | (3 << REG_Z), \
298 0x00000000}, /* POINTER_REGS, r26 - r31 */ \
299 {(3 << REG_X) | (3 << REG_Y) | (3 << REG_Z) | (3 << REG_W), \
300 0x00000000}, /* ADDW_REGS, r24 - r31 */ \
301 {0x00ff0000,0x00000000}, /* SIMPLE_LD_REGS r16 - r23 */ \
302 {(3 << REG_X)|(3 << REG_Y)|(3 << REG_Z)|(3 << REG_W)|(0xff << 16), \
303 0x00000000}, /* LD_REGS, r16 - r31 */ \
304 {0x0000ffff,0x00000000}, /* NO_LD_REGS r0 - r15 */ \
305 {0xffffffff,0x00000000}, /* GENERAL_REGS, r0 - r31 */ \
306 {0xffffffff,0x00000003} /* ALL_REGS */ \
309 #define REGNO_REG_CLASS(R) avr_regno_reg_class(R)
311 #define BASE_REG_CLASS (reload_completed ? BASE_POINTER_REGS : POINTER_REGS)
313 #define INDEX_REG_CLASS NO_REGS
315 #define REGNO_OK_FOR_BASE_P(r) (((r) < FIRST_PSEUDO_REGISTER \
319 || (r) == ARG_POINTER_REGNUM)) \
321 && (reg_renumber[r] == REG_X \
322 || reg_renumber[r] == REG_Y \
323 || reg_renumber[r] == REG_Z \
324 || (reg_renumber[r] \
325 == ARG_POINTER_REGNUM))))
327 #define REGNO_OK_FOR_INDEX_P(NUM) 0
329 #define TARGET_SMALL_REGISTER_CLASSES_FOR_MODE_P hook_bool_mode_true
331 #define STACK_PUSH_CODE POST_DEC
333 #define STACK_GROWS_DOWNWARD
335 #define STARTING_FRAME_OFFSET 1
337 #define STACK_POINTER_OFFSET 1
339 #define FIRST_PARM_OFFSET(FUNDECL) 0
341 #define STACK_BOUNDARY 8
343 #define STACK_POINTER_REGNUM 32
345 #define FRAME_POINTER_REGNUM REG_Y
347 #define ARG_POINTER_REGNUM 34
349 #define STATIC_CHAIN_REGNUM 2
351 #define ELIMINABLE_REGS { \
352 {ARG_POINTER_REGNUM, FRAME_POINTER_REGNUM}, \
353 {FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM} \
354 ,{FRAME_POINTER_REGNUM+1,STACK_POINTER_REGNUM+1}}
356 #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET) \
357 OFFSET = avr_initial_elimination_offset (FROM, TO)
359 #define RETURN_ADDR_RTX(count, tem) avr_return_addr_rtx (count, tem)
361 /* Don't use Push rounding. expr.c: emit_single_push_insn is broken
362 for POST_DEC targets (PR27386). */
363 /*#define PUSH_ROUNDING(NPUSHED) (NPUSHED)*/
365 typedef struct avr_args {
366 int nregs; /* # registers available for passing */
367 int regno; /* next available register number */
370 #define INIT_CUMULATIVE_ARGS(CUM, FNTYPE, LIBNAME, FNDECL, N_NAMED_ARGS) \
371 init_cumulative_args (&(CUM), FNTYPE, LIBNAME, FNDECL)
373 #define FUNCTION_ARG_REGNO_P(r) function_arg_regno_p(r)
375 #define DEFAULT_PCC_STRUCT_RETURN 0
377 #define EPILOGUE_USES(REGNO) avr_epilogue_uses(REGNO)
379 #define HAVE_POST_INCREMENT 1
380 #define HAVE_PRE_DECREMENT 1
382 #define MAX_REGS_PER_ADDRESS 1
384 #define REG_OK_FOR_BASE_NOSTRICT_P(X) \
385 (REGNO (X) >= FIRST_PSEUDO_REGISTER || REG_OK_FOR_BASE_STRICT_P(X))
387 #define REG_OK_FOR_BASE_STRICT_P(X) REGNO_OK_FOR_BASE_P (REGNO (X))
389 /* LEGITIMIZE_RELOAD_ADDRESS will allow register R26/27 to be used, where it
390 is no worse than normal base pointers R28/29 and R30/31. For example:
391 If base offset is greater than 63 bytes or for R++ or --R addressing. */
393 #define LEGITIMIZE_RELOAD_ADDRESS(X, MODE, OPNUM, TYPE, IND_LEVELS, WIN) \
395 if (1&&(GET_CODE (X) == POST_INC || GET_CODE (X) == PRE_DEC)) \
397 push_reload (XEXP (X,0), XEXP (X,0), &XEXP (X,0), &XEXP (X,0), \
398 POINTER_REGS, GET_MODE (X),GET_MODE (X) , 0, 0, \
399 OPNUM, RELOAD_OTHER); \
402 if (GET_CODE (X) == PLUS \
403 && REG_P (XEXP (X, 0)) \
404 && (reg_equiv_constant (REGNO (XEXP (X, 0))) == 0) \
405 && GET_CODE (XEXP (X, 1)) == CONST_INT \
406 && INTVAL (XEXP (X, 1)) >= 1) \
408 int fit = INTVAL (XEXP (X, 1)) <= (64 - GET_MODE_SIZE (MODE)); \
411 if (reg_equiv_address (REGNO (XEXP (X, 0))) != 0) \
413 int regno = REGNO (XEXP (X, 0)); \
414 rtx mem = make_memloc (X, regno); \
415 push_reload (XEXP (mem,0), NULL, &XEXP (mem,0), NULL, \
416 POINTER_REGS, Pmode, VOIDmode, 0, 0, \
417 1, ADDR_TYPE (TYPE)); \
418 push_reload (mem, NULL_RTX, &XEXP (X, 0), NULL, \
419 BASE_POINTER_REGS, GET_MODE (X), VOIDmode, 0, 0, \
424 else if (! (frame_pointer_needed && XEXP (X,0) == frame_pointer_rtx)) \
426 push_reload (X, NULL_RTX, &X, NULL, \
427 POINTER_REGS, GET_MODE (X), VOIDmode, 0, 0, \
434 #define BRANCH_COST(speed_p, predictable_p) 0
436 #define SLOW_BYTE_ACCESS 0
438 #define NO_FUNCTION_CSE
440 #define TEXT_SECTION_ASM_OP "\t.text"
442 #define DATA_SECTION_ASM_OP "\t.data"
444 #define BSS_SECTION_ASM_OP "\t.section .bss"
446 /* Define the pseudo-ops used to switch to the .ctors and .dtors sections.
447 There are no shared libraries on this target, and these sections are
448 placed in the read-only program memory, so they are not writable. */
450 #undef CTORS_SECTION_ASM_OP
451 #define CTORS_SECTION_ASM_OP "\t.section .ctors,\"a\",@progbits"
453 #undef DTORS_SECTION_ASM_OP
454 #define DTORS_SECTION_ASM_OP "\t.section .dtors,\"a\",@progbits"
456 #define TARGET_ASM_CONSTRUCTOR avr_asm_out_ctor
458 #define TARGET_ASM_DESTRUCTOR avr_asm_out_dtor
460 #define SUPPORTS_INIT_PRIORITY 0
462 #define JUMP_TABLES_IN_TEXT_SECTION 0
464 #define ASM_COMMENT_START " ; "
466 #define ASM_APP_ON "/* #APP */\n"
468 #define ASM_APP_OFF "/* #NOAPP */\n"
470 #define IS_ASM_LOGICAL_LINE_SEPARATOR(C, STR) ((C) == '\n' || ((C) == '$'))
472 #define ASM_OUTPUT_ALIGNED_DECL_COMMON(STREAM, DECL, NAME, SIZE, ALIGN) \
473 avr_asm_output_aligned_decl_common (STREAM, DECL, NAME, SIZE, ALIGN, false)
475 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
476 asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN)
478 #define ASM_OUTPUT_ALIGNED_DECL_LOCAL(STREAM, DECL, NAME, SIZE, ALIGN) \
479 avr_asm_output_aligned_decl_common (STREAM, DECL, NAME, SIZE, ALIGN, true)
481 /* Globalizing directive for a label. */
482 #define GLOBAL_ASM_OP ".global\t"
484 #define SUPPORTS_WEAK 1
486 #define HAS_INIT_SECTION 1
488 #define REGISTER_NAMES { \
489 "r0","r1","r2","r3","r4","r5","r6","r7", \
490 "r8","r9","r10","r11","r12","r13","r14","r15", \
491 "r16","r17","r18","r19","r20","r21","r22","r23", \
492 "r24","r25","r26","r27","r28","r29","r30","r31", \
493 "__SP_L__","__SP_H__","argL","argH"}
495 #define FINAL_PRESCAN_INSN(insn, operand, nop) final_prescan_insn (insn, operand,nop)
497 #define PRINT_OPERAND(STREAM, X, CODE) print_operand (STREAM, X, CODE)
499 #define PRINT_OPERAND_PUNCT_VALID_P(CODE) ((CODE) == '~' || (CODE) == '!')
501 #define PRINT_OPERAND_ADDRESS(STREAM, X) print_operand_address(STREAM, X)
503 #define ASSEMBLER_DIALECT AVR_HAVE_MOVW
505 #define ASM_OUTPUT_REG_PUSH(STREAM, REGNO) \
507 gcc_assert (REGNO < 32); \
508 fprintf (STREAM, "\tpush\tr%d", REGNO); \
511 #define ASM_OUTPUT_REG_POP(STREAM, REGNO) \
513 gcc_assert (REGNO < 32); \
514 fprintf (STREAM, "\tpop\tr%d", REGNO); \
517 #define ASM_OUTPUT_ADDR_VEC_ELT(STREAM, VALUE) \
518 avr_output_addr_vec_elt(STREAM, VALUE)
520 #define ASM_OUTPUT_ALIGN(STREAM, POWER) \
523 fprintf (STREAM, "\t.p2align\t%d\n", POWER); \
526 #define CASE_VECTOR_MODE HImode
528 #undef WORD_REGISTER_OPERATIONS
532 #define TRULY_NOOP_TRUNCATION(OUTPREC, INPREC) 1
536 #define FUNCTION_MODE HImode
538 #define DOLLARS_IN_IDENTIFIERS 0
540 #define TRAMPOLINE_SIZE 4
542 /* Store in cc_status the expressions
543 that the condition codes will describe
544 after execution of an instruction whose pattern is EXP.
545 Do not alter them if the instruction would not alter the cc's. */
547 #define NOTICE_UPDATE_CC(EXP, INSN) notice_update_cc(EXP, INSN)
549 /* The add insns don't set overflow in a usable way. */
550 #define CC_OVERFLOW_UNUSABLE 01000
551 /* The mov,and,or,xor insns don't set carry. That's ok though as the
552 Z bit is all we need when doing unsigned comparisons on the result of
553 these insns (since they're always with 0). However, conditions.h has
554 CC_NO_OVERFLOW defined for this purpose. Rename it to something more
556 #define CC_NO_CARRY CC_NO_OVERFLOW
559 /* Output assembler code to FILE to increment profiler label # LABELNO
560 for profiling a function entry. */
562 #define FUNCTION_PROFILER(FILE, LABELNO) \
563 fprintf (FILE, "/* profiler %d */", (LABELNO))
565 #define ADJUST_INSN_LENGTH(INSN, LENGTH) (LENGTH =\
566 adjust_insn_length (INSN, LENGTH))
568 extern const char *avr_device_to_arch (int argc, const char **argv);
569 extern const char *avr_device_to_data_start (int argc, const char **argv);
570 extern const char *avr_device_to_startfiles (int argc, const char **argv);
571 extern const char *avr_device_to_devicelib (int argc, const char **argv);
573 #define EXTRA_SPEC_FUNCTIONS \
574 { "device_to_arch", avr_device_to_arch }, \
575 { "device_to_data_start", avr_device_to_data_start }, \
576 { "device_to_startfile", avr_device_to_startfiles }, \
577 { "device_to_devicelib", avr_device_to_devicelib },
583 #define CC1PLUS_SPEC "%{!frtti:-fno-rtti} \
584 %{!fenforce-eh-specs:-fno-enforce-eh-specs} \
585 %{!fexceptions:-fno-exceptions}"
586 /* A C string constant that tells the GCC driver program options to
587 pass to `cc1plus'. */
589 #define ASM_SPEC "%{mmcu=avr25:-mmcu=avr2;mmcu=avr35:-mmcu=avr3;mmcu=avr31:-mmcu=avr3;mmcu=avr51:-mmcu=avr5;\
594 %{mpmem-wrap-around:%{mmcu=at90usb8*:--pmem-wrap-around=8k}\
595 %{mmcu=atmega16*:--pmem-wrap-around=16k}\
597 mmcu=at90can32*:--pmem-wrap-around=32k}\
600 mmcu=at90usb64*:--pmem-wrap-around=64k}}}\
601 %:device_to_arch(%{mmcu=*:%*})\
602 %:device_to_data_start(%{mmcu=*:%*})"
605 "%{!mmcu=at90s1*:%{!mmcu=attiny11:%{!mmcu=attiny12:%{!mmcu=attiny15:%{!mmcu=attiny28: -lc }}}}}"
607 #define LIBSTDCXX "gcc"
608 /* No libstdc++ for now. Empty string doesn't work. */
610 #define LIBGCC_SPEC \
611 "%{!mmcu=at90s1*:%{!mmcu=attiny11:%{!mmcu=attiny12:%{!mmcu=attiny15:%{!mmcu=attiny28: -lgcc }}}}}"
613 #define STARTFILE_SPEC "%:device_to_startfile(%{mmcu=*:%*})"
615 #define ENDFILE_SPEC ""
617 /* This is the default without any -mmcu=* option (AT90S*). */
618 #define MULTILIB_DEFAULTS { "mmcu=avr2" }
620 #define TEST_HARD_REG_CLASS(CLASS, REGNO) \
621 TEST_HARD_REG_BIT (reg_class_contents[ (int) (CLASS)], REGNO)
623 /* Note that the other files fail to use these
624 in some of the places where they should. */
626 #if defined(__STDC__) || defined(ALMOST_STDC)
627 #define AS2(a,b,c) #a " " #b "," #c
628 #define AS2C(b,c) " " #b "," #c
629 #define AS3(a,b,c,d) #a " " #b "," #c "," #d
630 #define AS1(a,b) #a " " #b
632 #define AS1(a,b) "a b"
633 #define AS2(a,b,c) "a b,c"
634 #define AS2C(b,c) " b,c"
635 #define AS3(a,b,c,d) "a b,c,d"
637 #define OUT_AS1(a,b) output_asm_insn (AS1(a,b), operands)
638 #define OUT_AS2(a,b,c) output_asm_insn (AS2(a,b,c), operands)
639 #define CR_TAB "\n\t"
641 #define DWARF2_ADDR_SIZE 4
643 #define INCOMING_RETURN_ADDR_RTX avr_incoming_return_addr_rtx ()
644 #define INCOMING_FRAME_SP_OFFSET (AVR_3_BYTE_PC ? 3 : 2)
646 /* The caller's stack pointer value immediately before the call
647 is one byte below the first argument. */
648 #define ARG_POINTER_CFA_OFFSET(FNDECL) -1
650 #define HARD_REGNO_RENAME_OK(OLD_REG, NEW_REG) \
651 avr_hard_regno_rename_ok (OLD_REG, NEW_REG)
653 /* A C structure for machine-specific, per-function data.
654 This is added to the cfun structure. */
655 struct GTY(()) machine_function
657 /* 'true' - if current function is a naked function. */
660 /* 'true' - if current function is an interrupt function
661 as specified by the "interrupt" attribute. */
664 /* 'true' - if current function is a signal function
665 as specified by the "signal" attribute. */
668 /* 'true' - if current function is a 'task' function
669 as specified by the "OS_task" attribute. */
672 /* 'true' - if current function is a 'main' function
673 as specified by the "OS_main" attribute. */
676 /* Current function stack size. */
679 /* 'true' if a callee might be tail called */
683 /* AVR does not round pushes, but the existance of this macro is
684 required in order for pushes to be generated. */
685 #define PUSH_ROUNDING(X) (X)