1 /* Definitions of target machine for GCC for IA-32.
2 Copyright (C) 1988, 1992, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001, 2002, 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
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. */
22 /* The purpose of this file is to define the characteristics of the i386,
23 independent of assembler syntax or operating system.
25 Three other files build on this one to describe a specific assembler syntax:
26 bsd386.h, att386.h, and sun386.h.
28 The actual tm.h file for a particular system should include
29 this file, and then the file for the appropriate assembler syntax.
31 Many macros that specify assembler syntax are omitted entirely from
32 this file because they really belong in the files for particular
33 assemblers. These include RP, IP, LPREFIX, PUT_OP_SIZE, USE_STAR,
34 ADDR_BEG, ADDR_END, PRINT_IREG, PRINT_SCALE, PRINT_B_I_S, and many
35 that start with ASM_ or end in ASM_OP. */
37 /* Define the specific costs for a given cpu */
39 struct processor_costs {
40 const int add; /* cost of an add instruction */
41 const int lea; /* cost of a lea instruction */
42 const int shift_var; /* variable shift costs */
43 const int shift_const; /* constant shift costs */
44 const int mult_init[5]; /* cost of starting a multiply
45 in QImode, HImode, SImode, DImode, TImode*/
46 const int mult_bit; /* cost of multiply per each bit set */
47 const int divide[5]; /* cost of a divide/mod
48 in QImode, HImode, SImode, DImode, TImode*/
49 int movsx; /* The cost of movsx operation. */
50 int movzx; /* The cost of movzx operation. */
51 const int large_insn; /* insns larger than this cost more */
52 const int move_ratio; /* The threshold of number of scalar
53 memory-to-memory move insns. */
54 const int movzbl_load; /* cost of loading using movzbl */
55 const int int_load[3]; /* cost of loading integer registers
56 in QImode, HImode and SImode relative
57 to reg-reg move (2). */
58 const int int_store[3]; /* cost of storing integer register
59 in QImode, HImode and SImode */
60 const int fp_move; /* cost of reg,reg fld/fst */
61 const int fp_load[3]; /* cost of loading FP register
62 in SFmode, DFmode and XFmode */
63 const int fp_store[3]; /* cost of storing FP register
64 in SFmode, DFmode and XFmode */
65 const int mmx_move; /* cost of moving MMX register. */
66 const int mmx_load[2]; /* cost of loading MMX register
67 in SImode and DImode */
68 const int mmx_store[2]; /* cost of storing MMX register
69 in SImode and DImode */
70 const int sse_move; /* cost of moving SSE register. */
71 const int sse_load[3]; /* cost of loading SSE register
72 in SImode, DImode and TImode*/
73 const int sse_store[3]; /* cost of storing SSE register
74 in SImode, DImode and TImode*/
75 const int mmxsse_to_integer; /* cost of moving mmxsse register to
76 integer and vice versa. */
77 const int prefetch_block; /* bytes moved to cache for prefetch. */
78 const int simultaneous_prefetches; /* number of parallel prefetch
80 const int branch_cost; /* Default value for BRANCH_COST. */
81 const int fadd; /* cost of FADD and FSUB instructions. */
82 const int fmul; /* cost of FMUL instruction. */
83 const int fdiv; /* cost of FDIV instruction. */
84 const int fabs; /* cost of FABS instruction. */
85 const int fchs; /* cost of FCHS instruction. */
86 const int fsqrt; /* cost of FSQRT instruction. */
89 extern const struct processor_costs *ix86_cost;
91 /* Macros used in the machine description to test the flags. */
93 /* configure can arrange to make this 2, to force a 486. */
95 #ifndef TARGET_CPU_DEFAULT
96 #define TARGET_CPU_DEFAULT TARGET_CPU_DEFAULT_generic
99 #ifndef TARGET_FPMATH_DEFAULT
100 #define TARGET_FPMATH_DEFAULT \
101 (TARGET_64BIT && TARGET_SSE ? FPMATH_SSE : FPMATH_387)
104 #define TARGET_FLOAT_RETURNS_IN_80387 TARGET_FLOAT_RETURNS
106 /* 64bit Sledgehammer mode. For libgcc2 we make sure this is a
107 compile-time constant. */
111 #define TARGET_64BIT 1
113 #define TARGET_64BIT 0
116 #ifndef TARGET_BI_ARCH
118 #if TARGET_64BIT_DEFAULT
119 #define TARGET_64BIT 1
121 #define TARGET_64BIT 0
126 #define HAS_LONG_COND_BRANCH 1
127 #define HAS_LONG_UNCOND_BRANCH 1
129 #define TARGET_386 (ix86_tune == PROCESSOR_I386)
130 #define TARGET_486 (ix86_tune == PROCESSOR_I486)
131 #define TARGET_PENTIUM (ix86_tune == PROCESSOR_PENTIUM)
132 #define TARGET_PENTIUMPRO (ix86_tune == PROCESSOR_PENTIUMPRO)
133 #define TARGET_GEODE (ix86_tune == PROCESSOR_GEODE)
134 #define TARGET_K6 (ix86_tune == PROCESSOR_K6)
135 #define TARGET_ATHLON (ix86_tune == PROCESSOR_ATHLON)
136 #define TARGET_PENTIUM4 (ix86_tune == PROCESSOR_PENTIUM4)
137 #define TARGET_K8 (ix86_tune == PROCESSOR_K8)
138 #define TARGET_ATHLON_K8 (TARGET_K8 || TARGET_ATHLON)
139 #define TARGET_NOCONA (ix86_tune == PROCESSOR_NOCONA)
140 #define TARGET_CORE2 (ix86_tune == PROCESSOR_CORE2)
141 #define TARGET_GENERIC32 (ix86_tune == PROCESSOR_GENERIC32)
142 #define TARGET_GENERIC64 (ix86_tune == PROCESSOR_GENERIC64)
143 #define TARGET_GENERIC (TARGET_GENERIC32 || TARGET_GENERIC64)
144 #define TARGET_AMDFAM10 (ix86_tune == PROCESSOR_AMDFAM10)
146 #define TUNEMASK (1 << ix86_tune)
147 extern const int x86_use_leave, x86_push_memory, x86_zero_extend_with_and;
148 extern const int x86_use_bit_test, x86_cmove, x86_deep_branch;
149 extern const int x86_branch_hints, x86_unroll_strlen;
150 extern const int x86_double_with_add, x86_partial_reg_stall, x86_movx;
151 extern const int x86_use_himode_fiop, x86_use_simode_fiop;
152 extern const int x86_use_mov0, x86_use_cltd, x86_read_modify_write;
153 extern const int x86_read_modify, x86_split_long_moves;
154 extern const int x86_promote_QImode, x86_single_stringop, x86_fast_prefix;
155 extern const int x86_himode_math, x86_qimode_math, x86_promote_qi_regs;
156 extern const int x86_promote_hi_regs, x86_integer_DFmode_moves;
157 extern const int x86_add_esp_4, x86_add_esp_8, x86_sub_esp_4, x86_sub_esp_8;
158 extern const int x86_partial_reg_dependency, x86_memory_mismatch_stall;
159 extern const int x86_accumulate_outgoing_args, x86_prologue_using_move;
160 extern const int x86_epilogue_using_move, x86_decompose_lea;
161 extern const int x86_arch_always_fancy_math_387, x86_shift1;
162 extern const int x86_sse_partial_reg_dependency, x86_sse_split_regs;
163 extern const int x86_sse_unaligned_move_optimal;
164 extern const int x86_sse_typeless_stores, x86_sse_load0_by_pxor;
165 extern const int x86_use_ffreep;
166 extern const int x86_inter_unit_moves, x86_schedule;
167 extern const int x86_use_bt;
168 extern const int x86_cmpxchg, x86_cmpxchg8b, x86_xadd;
169 extern const int x86_use_incdec;
170 extern const int x86_pad_returns;
171 extern const int x86_partial_flag_reg_stall;
172 extern int x86_prefetch_sse, x86_cmpxchg16b;
174 #define TARGET_USE_LEAVE (x86_use_leave & TUNEMASK)
175 #define TARGET_PUSH_MEMORY (x86_push_memory & TUNEMASK)
176 #define TARGET_ZERO_EXTEND_WITH_AND (x86_zero_extend_with_and & TUNEMASK)
177 #define TARGET_USE_BIT_TEST (x86_use_bit_test & TUNEMASK)
178 #define TARGET_UNROLL_STRLEN (x86_unroll_strlen & TUNEMASK)
179 /* For sane SSE instruction set generation we need fcomi instruction. It is
180 safe to enable all CMOVE instructions. */
181 #define TARGET_CMOVE ((x86_cmove & (1 << ix86_arch)) || TARGET_SSE)
182 #define TARGET_FISTTP (TARGET_SSE3 && TARGET_80387)
183 #define TARGET_DEEP_BRANCH_PREDICTION (x86_deep_branch & TUNEMASK)
184 #define TARGET_BRANCH_PREDICTION_HINTS (x86_branch_hints & TUNEMASK)
185 #define TARGET_DOUBLE_WITH_ADD (x86_double_with_add & TUNEMASK)
186 #define TARGET_USE_SAHF ((x86_use_sahf & TUNEMASK) && !TARGET_64BIT)
187 #define TARGET_MOVX (x86_movx & TUNEMASK)
188 #define TARGET_PARTIAL_REG_STALL (x86_partial_reg_stall & TUNEMASK)
189 #define TARGET_PARTIAL_FLAG_REG_STALL (x86_partial_flag_reg_stall & TUNEMASK)
190 #define TARGET_USE_HIMODE_FIOP (x86_use_himode_fiop & TUNEMASK)
191 #define TARGET_USE_SIMODE_FIOP (x86_use_simode_fiop & TUNEMASK)
192 #define TARGET_USE_MOV0 (x86_use_mov0 & TUNEMASK)
193 #define TARGET_USE_CLTD (x86_use_cltd & TUNEMASK)
194 #define TARGET_SPLIT_LONG_MOVES (x86_split_long_moves & TUNEMASK)
195 #define TARGET_READ_MODIFY_WRITE (x86_read_modify_write & TUNEMASK)
196 #define TARGET_READ_MODIFY (x86_read_modify & TUNEMASK)
197 #define TARGET_PROMOTE_QImode (x86_promote_QImode & TUNEMASK)
198 #define TARGET_FAST_PREFIX (x86_fast_prefix & TUNEMASK)
199 #define TARGET_SINGLE_STRINGOP (x86_single_stringop & TUNEMASK)
200 #define TARGET_QIMODE_MATH (x86_qimode_math & TUNEMASK)
201 #define TARGET_HIMODE_MATH (x86_himode_math & TUNEMASK)
202 #define TARGET_PROMOTE_QI_REGS (x86_promote_qi_regs & TUNEMASK)
203 #define TARGET_PROMOTE_HI_REGS (x86_promote_hi_regs & TUNEMASK)
204 #define TARGET_ADD_ESP_4 (x86_add_esp_4 & TUNEMASK)
205 #define TARGET_ADD_ESP_8 (x86_add_esp_8 & TUNEMASK)
206 #define TARGET_SUB_ESP_4 (x86_sub_esp_4 & TUNEMASK)
207 #define TARGET_SUB_ESP_8 (x86_sub_esp_8 & TUNEMASK)
208 #define TARGET_INTEGER_DFMODE_MOVES (x86_integer_DFmode_moves & TUNEMASK)
209 #define TARGET_PARTIAL_REG_DEPENDENCY (x86_partial_reg_dependency & TUNEMASK)
210 #define TARGET_SSE_PARTIAL_REG_DEPENDENCY \
211 (x86_sse_partial_reg_dependency & TUNEMASK)
212 #define TARGET_SSE_UNALIGNED_MOVE_OPTIMAL \
213 (x86_sse_unaligned_move_optimal & TUNEMASK)
214 #define TARGET_SSE_SPLIT_REGS (x86_sse_split_regs & TUNEMASK)
215 #define TARGET_SSE_TYPELESS_STORES (x86_sse_typeless_stores & TUNEMASK)
216 #define TARGET_SSE_LOAD0_BY_PXOR (x86_sse_load0_by_pxor & TUNEMASK)
217 #define TARGET_MEMORY_MISMATCH_STALL (x86_memory_mismatch_stall & TUNEMASK)
218 #define TARGET_PROLOGUE_USING_MOVE (x86_prologue_using_move & TUNEMASK)
219 #define TARGET_EPILOGUE_USING_MOVE (x86_epilogue_using_move & TUNEMASK)
220 #define TARGET_PREFETCH_SSE (x86_prefetch_sse)
221 #define TARGET_SHIFT1 (x86_shift1 & TUNEMASK)
222 #define TARGET_USE_FFREEP (x86_use_ffreep & TUNEMASK)
223 #define TARGET_REP_MOVL_OPTIMAL (x86_rep_movl_optimal & TUNEMASK)
224 #define TARGET_INTER_UNIT_MOVES (x86_inter_unit_moves & TUNEMASK)
225 #define TARGET_FOUR_JUMP_LIMIT (x86_four_jump_limit & TUNEMASK)
226 #define TARGET_SCHEDULE (x86_schedule & TUNEMASK)
227 #define TARGET_USE_BT (x86_use_bt & TUNEMASK)
228 #define TARGET_USE_INCDEC (x86_use_incdec & TUNEMASK)
229 #define TARGET_PAD_RETURNS (x86_pad_returns & TUNEMASK)
231 #define ASSEMBLER_DIALECT (ix86_asm_dialect)
233 #define TARGET_SSE_MATH ((ix86_fpmath & FPMATH_SSE) != 0)
234 #define TARGET_MIX_SSE_I387 ((ix86_fpmath & FPMATH_SSE) \
235 && (ix86_fpmath & FPMATH_387))
237 #define TARGET_GNU_TLS (ix86_tls_dialect == TLS_DIALECT_GNU)
238 #define TARGET_GNU2_TLS (ix86_tls_dialect == TLS_DIALECT_GNU2)
239 #define TARGET_ANY_GNU_TLS (TARGET_GNU_TLS || TARGET_GNU2_TLS)
240 #define TARGET_SUN_TLS (ix86_tls_dialect == TLS_DIALECT_SUN)
242 #define TARGET_CMPXCHG (x86_cmpxchg & (1 << ix86_arch))
243 #define TARGET_CMPXCHG8B (x86_cmpxchg8b & (1 << ix86_arch))
244 #define TARGET_CMPXCHG16B (x86_cmpxchg16b)
245 #define TARGET_XADD (x86_xadd & (1 << ix86_arch))
247 #ifndef TARGET_64BIT_DEFAULT
248 #define TARGET_64BIT_DEFAULT 0
250 #ifndef TARGET_TLS_DIRECT_SEG_REFS_DEFAULT
251 #define TARGET_TLS_DIRECT_SEG_REFS_DEFAULT 0
254 /* Once GDB has been enhanced to deal with functions without frame
255 pointers, we can change this to allow for elimination of
256 the frame pointer in leaf functions. */
257 #define TARGET_DEFAULT 0
259 /* This is not really a target flag, but is done this way so that
260 it's analogous to similar code for Mach-O on PowerPC. darwin.h
261 redefines this to 1. */
262 #define TARGET_MACHO 0
264 /* Subtargets may reset this to 1 in order to enable 96-bit long double
265 with the rounding mode forced to 53 bits. */
266 #define TARGET_96_ROUND_53_LONG_DOUBLE 0
268 /* Sometimes certain combinations of command options do not make
269 sense on a particular target machine. You can define a macro
270 `OVERRIDE_OPTIONS' to take account of this. This macro, if
271 defined, is executed once just after all the command options have
274 Don't use this macro to turn on various extra optimizations for
275 `-O'. That is what `OPTIMIZATION_OPTIONS' is for. */
277 #define OVERRIDE_OPTIONS override_options ()
279 /* Define this to change the optimizations performed by default. */
280 #define OPTIMIZATION_OPTIONS(LEVEL, SIZE) \
281 optimization_options ((LEVEL), (SIZE))
283 /* -march=native handling only makes sense with compiler running on
284 an x86 or x86_64 chip. If changing this condition, also change
285 the condition in driver-i386.c. */
286 #if defined(__i386__) || defined(__x86_64__)
287 /* In driver-i386.c. */
288 extern const char *host_detect_local_cpu (int argc, const char **argv);
289 #define EXTRA_SPEC_FUNCTIONS \
290 { "local_cpu_detect", host_detect_local_cpu },
291 #define HAVE_LOCAL_CPU_DETECT
294 /* Support for configure-time defaults of some command line options.
295 The order here is important so that -march doesn't squash the
296 tune or cpu values. */
297 #define OPTION_DEFAULT_SPECS \
298 {"tune", "%{!mtune=*:%{!mcpu=*:%{!march=*:-mtune=%(VALUE)}}}" }, \
299 {"cpu", "%{!mtune=*:%{!mcpu=*:%{!march=*:-mtune=%(VALUE)}}}" }, \
300 {"arch", "%{!march=*:-march=%(VALUE)}"}
302 /* Specs for the compiler proper */
305 #define CC1_CPU_SPEC_1 "\
308 %n`-m386' is deprecated. Use `-march=i386' or `-mtune=i386' instead.\n} \
310 %n`-m486' is deprecated. Use `-march=i486' or `-mtune=i486' instead.\n} \
311 %{mpentium:-mtune=pentium \
312 %n`-mpentium' is deprecated. Use `-march=pentium' or `-mtune=pentium' instead.\n} \
313 %{mpentiumpro:-mtune=pentiumpro \
314 %n`-mpentiumpro' is deprecated. Use `-march=pentiumpro' or `-mtune=pentiumpro' instead.\n} \
316 %n`-mcpu=' is deprecated. Use `-mtune=' or '-march=' instead.\n}} \
318 %{mintel-syntax:-masm=intel \
319 %n`-mintel-syntax' is deprecated. Use `-masm=intel' instead.\n} \
320 %{mno-intel-syntax:-masm=att \
321 %n`-mno-intel-syntax' is deprecated. Use `-masm=att' instead.\n}"
323 #ifndef HAVE_LOCAL_CPU_DETECT
324 #define CC1_CPU_SPEC CC1_CPU_SPEC_1
326 #define CC1_CPU_SPEC CC1_CPU_SPEC_1 \
327 "%{march=native:%<march=native %:local_cpu_detect(arch) \
328 %{!mtune=*:%<mtune=native %:local_cpu_detect(tune)}} \
329 %{mtune=native:%<mtune=native %:local_cpu_detect(tune)}"
333 /* Target CPU builtins. */
334 #define TARGET_CPU_CPP_BUILTINS() \
337 size_t arch_len = strlen (ix86_arch_string); \
338 size_t tune_len = strlen (ix86_tune_string); \
339 int last_arch_char = ix86_arch_string[arch_len - 1]; \
340 int last_tune_char = ix86_tune_string[tune_len - 1]; \
344 builtin_assert ("cpu=x86_64"); \
345 builtin_assert ("machine=x86_64"); \
346 builtin_define ("__amd64"); \
347 builtin_define ("__amd64__"); \
348 builtin_define ("__x86_64"); \
349 builtin_define ("__x86_64__"); \
353 builtin_assert ("cpu=i386"); \
354 builtin_assert ("machine=i386"); \
355 builtin_define_std ("i386"); \
358 /* Built-ins based on -mtune= (or -march= if no \
361 builtin_define ("__tune_i386__"); \
362 else if (TARGET_486) \
363 builtin_define ("__tune_i486__"); \
364 else if (TARGET_PENTIUM) \
366 builtin_define ("__tune_i586__"); \
367 builtin_define ("__tune_pentium__"); \
368 if (last_tune_char == 'x') \
369 builtin_define ("__tune_pentium_mmx__"); \
371 else if (TARGET_PENTIUMPRO) \
373 builtin_define ("__tune_i686__"); \
374 builtin_define ("__tune_pentiumpro__"); \
375 switch (last_tune_char) \
378 builtin_define ("__tune_pentium3__"); \
381 builtin_define ("__tune_pentium2__"); \
385 else if (TARGET_GEODE) \
387 builtin_define ("__tune_geode__"); \
389 else if (TARGET_K6) \
391 builtin_define ("__tune_k6__"); \
392 if (last_tune_char == '2') \
393 builtin_define ("__tune_k6_2__"); \
394 else if (last_tune_char == '3') \
395 builtin_define ("__tune_k6_3__"); \
397 else if (TARGET_ATHLON) \
399 builtin_define ("__tune_athlon__"); \
400 /* Plain "athlon" & "athlon-tbird" lacks SSE. */ \
401 if (last_tune_char != 'n' && last_tune_char != 'd') \
402 builtin_define ("__tune_athlon_sse__"); \
404 else if (TARGET_K8) \
405 builtin_define ("__tune_k8__"); \
406 else if (TARGET_AMDFAM10) \
407 builtin_define ("__tune_amdfam10__"); \
408 else if (TARGET_PENTIUM4) \
409 builtin_define ("__tune_pentium4__"); \
410 else if (TARGET_NOCONA) \
411 builtin_define ("__tune_nocona__"); \
412 else if (TARGET_CORE2) \
413 builtin_define ("__tune_core2__"); \
416 builtin_define ("__MMX__"); \
418 builtin_define ("__3dNOW__"); \
419 if (TARGET_3DNOW_A) \
420 builtin_define ("__3dNOW_A__"); \
422 builtin_define ("__SSE__"); \
424 builtin_define ("__SSE2__"); \
426 builtin_define ("__SSE3__"); \
428 builtin_define ("__SSSE3__"); \
430 builtin_define ("__SSE4A__"); \
431 if (TARGET_SSE_MATH && TARGET_SSE) \
432 builtin_define ("__SSE_MATH__"); \
433 if (TARGET_SSE_MATH && TARGET_SSE2) \
434 builtin_define ("__SSE2_MATH__"); \
436 /* Built-ins based on -march=. */ \
437 if (ix86_arch == PROCESSOR_I486) \
439 builtin_define ("__i486"); \
440 builtin_define ("__i486__"); \
442 else if (ix86_arch == PROCESSOR_PENTIUM) \
444 builtin_define ("__i586"); \
445 builtin_define ("__i586__"); \
446 builtin_define ("__pentium"); \
447 builtin_define ("__pentium__"); \
448 if (last_arch_char == 'x') \
449 builtin_define ("__pentium_mmx__"); \
451 else if (ix86_arch == PROCESSOR_PENTIUMPRO) \
453 builtin_define ("__i686"); \
454 builtin_define ("__i686__"); \
455 builtin_define ("__pentiumpro"); \
456 builtin_define ("__pentiumpro__"); \
458 else if (ix86_arch == PROCESSOR_GEODE) \
460 builtin_define ("__geode"); \
461 builtin_define ("__geode__"); \
463 else if (ix86_arch == PROCESSOR_K6) \
466 builtin_define ("__k6"); \
467 builtin_define ("__k6__"); \
468 if (last_arch_char == '2') \
469 builtin_define ("__k6_2__"); \
470 else if (last_arch_char == '3') \
471 builtin_define ("__k6_3__"); \
473 else if (ix86_arch == PROCESSOR_ATHLON) \
475 builtin_define ("__athlon"); \
476 builtin_define ("__athlon__"); \
477 /* Plain "athlon" & "athlon-tbird" lacks SSE. */ \
478 if (last_tune_char != 'n' && last_tune_char != 'd') \
479 builtin_define ("__athlon_sse__"); \
481 else if (ix86_arch == PROCESSOR_K8) \
483 builtin_define ("__k8"); \
484 builtin_define ("__k8__"); \
486 else if (ix86_arch == PROCESSOR_AMDFAM10) \
488 builtin_define ("__amdfam10"); \
489 builtin_define ("__amdfam10__"); \
491 else if (ix86_arch == PROCESSOR_PENTIUM4) \
493 builtin_define ("__pentium4"); \
494 builtin_define ("__pentium4__"); \
496 else if (ix86_arch == PROCESSOR_NOCONA) \
498 builtin_define ("__nocona"); \
499 builtin_define ("__nocona__"); \
501 else if (ix86_arch == PROCESSOR_CORE2) \
503 builtin_define ("__core2"); \
504 builtin_define ("__core2__"); \
509 #define TARGET_CPU_DEFAULT_i386 0
510 #define TARGET_CPU_DEFAULT_i486 1
511 #define TARGET_CPU_DEFAULT_pentium 2
512 #define TARGET_CPU_DEFAULT_pentium_mmx 3
513 #define TARGET_CPU_DEFAULT_pentiumpro 4
514 #define TARGET_CPU_DEFAULT_pentium2 5
515 #define TARGET_CPU_DEFAULT_pentium3 6
516 #define TARGET_CPU_DEFAULT_pentium4 7
517 #define TARGET_CPU_DEFAULT_geode 8
518 #define TARGET_CPU_DEFAULT_k6 9
519 #define TARGET_CPU_DEFAULT_k6_2 10
520 #define TARGET_CPU_DEFAULT_k6_3 11
521 #define TARGET_CPU_DEFAULT_athlon 12
522 #define TARGET_CPU_DEFAULT_athlon_sse 13
523 #define TARGET_CPU_DEFAULT_k8 14
524 #define TARGET_CPU_DEFAULT_pentium_m 15
525 #define TARGET_CPU_DEFAULT_prescott 16
526 #define TARGET_CPU_DEFAULT_nocona 17
527 #define TARGET_CPU_DEFAULT_core2 18
528 #define TARGET_CPU_DEFAULT_generic 19
529 #define TARGET_CPU_DEFAULT_amdfam10 20
531 #define TARGET_CPU_DEFAULT_NAMES {"i386", "i486", "pentium", "pentium-mmx",\
532 "pentiumpro", "pentium2", "pentium3", \
533 "pentium4", "geode", "k6", "k6-2", "k6-3", \
534 "athlon", "athlon-4", "k8", \
535 "pentium-m", "prescott", "nocona", \
536 "core2", "generic", "amdfam10"}
539 #define CC1_SPEC "%(cc1_cpu) "
542 /* This macro defines names of additional specifications to put in the
543 specs that can be used in various specifications like CC1_SPEC. Its
544 definition is an initializer with a subgrouping for each command option.
546 Each subgrouping contains a string constant, that defines the
547 specification name, and a string constant that used by the GCC driver
550 Do not define this macro if it does not need to do anything. */
552 #ifndef SUBTARGET_EXTRA_SPECS
553 #define SUBTARGET_EXTRA_SPECS
556 #define EXTRA_SPECS \
557 { "cc1_cpu", CC1_CPU_SPEC }, \
558 SUBTARGET_EXTRA_SPECS
560 /* target machine storage layout */
562 #define LONG_DOUBLE_TYPE_SIZE 80
564 /* Set the value of FLT_EVAL_METHOD in float.h. When using only the
565 FPU, assume that the fpcw is set to extended precision; when using
566 only SSE, rounding is correct; when using both SSE and the FPU,
567 the rounding precision is indeterminate, since either may be chosen
568 apparently at random. */
569 #define TARGET_FLT_EVAL_METHOD \
570 (TARGET_MIX_SSE_I387 ? -1 : TARGET_SSE_MATH ? 0 : 2)
572 #define SHORT_TYPE_SIZE 16
573 #define INT_TYPE_SIZE 32
574 #define FLOAT_TYPE_SIZE 32
575 #ifndef LONG_TYPE_SIZE
576 #define LONG_TYPE_SIZE BITS_PER_WORD
578 #define DOUBLE_TYPE_SIZE 64
579 #define LONG_LONG_TYPE_SIZE 64
581 #if defined (TARGET_BI_ARCH) || TARGET_64BIT_DEFAULT
582 #define MAX_BITS_PER_WORD 64
584 #define MAX_BITS_PER_WORD 32
587 /* Define this if most significant byte of a word is the lowest numbered. */
588 /* That is true on the 80386. */
590 #define BITS_BIG_ENDIAN 0
592 /* Define this if most significant byte of a word is the lowest numbered. */
593 /* That is not true on the 80386. */
594 #define BYTES_BIG_ENDIAN 0
596 /* Define this if most significant word of a multiword number is the lowest
598 /* Not true for 80386 */
599 #define WORDS_BIG_ENDIAN 0
601 /* Width of a word, in units (bytes). */
602 #define UNITS_PER_WORD (TARGET_64BIT ? 8 : 4)
604 #define MIN_UNITS_PER_WORD (TARGET_64BIT ? 8 : 4)
606 #define MIN_UNITS_PER_WORD 4
609 /* Allocation boundary (in *bits*) for storing arguments in argument list. */
610 #define PARM_BOUNDARY BITS_PER_WORD
612 /* Boundary (in *bits*) on which stack pointer should be aligned. */
613 #define STACK_BOUNDARY BITS_PER_WORD
615 /* Boundary (in *bits*) on which the stack pointer prefers to be
616 aligned; the compiler cannot rely on having this alignment. */
617 #define PREFERRED_STACK_BOUNDARY ix86_preferred_stack_boundary
619 /* As of July 2001, many runtimes do not align the stack properly when
620 entering main. This causes expand_main_function to forcibly align
621 the stack, which results in aligned frames for functions called from
622 main, though it does nothing for the alignment of main itself. */
623 #define FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN \
624 (ix86_preferred_stack_boundary > STACK_BOUNDARY && !TARGET_64BIT)
626 /* Minimum allocation boundary for the code of a function. */
627 #define FUNCTION_BOUNDARY 8
629 /* C++ stores the virtual bit in the lowest bit of function pointers. */
630 #define TARGET_PTRMEMFUNC_VBIT_LOCATION ptrmemfunc_vbit_in_pfn
632 /* Alignment of field after `int : 0' in a structure. */
634 #define EMPTY_FIELD_BOUNDARY BITS_PER_WORD
636 /* Minimum size in bits of the largest boundary to which any
637 and all fundamental data types supported by the hardware
638 might need to be aligned. No data type wants to be aligned
641 Pentium+ prefers DFmode values to be aligned to 64 bit boundary
642 and Pentium Pro XFmode values at 128 bit boundaries. */
644 #define BIGGEST_ALIGNMENT 128
646 /* Decide whether a variable of mode MODE should be 128 bit aligned. */
647 #define ALIGN_MODE_128(MODE) \
648 ((MODE) == XFmode || SSE_REG_MODE_P (MODE))
650 /* The published ABIs say that doubles should be aligned on word
651 boundaries, so lower the alignment for structure fields unless
652 -malign-double is set. */
654 /* ??? Blah -- this macro is used directly by libobjc. Since it
655 supports no vector modes, cut out the complexity and fall back
656 on BIGGEST_FIELD_ALIGNMENT. */
657 #ifdef IN_TARGET_LIBS
659 #define BIGGEST_FIELD_ALIGNMENT 128
661 #define BIGGEST_FIELD_ALIGNMENT 32
664 #define ADJUST_FIELD_ALIGN(FIELD, COMPUTED) \
665 x86_field_alignment (FIELD, COMPUTED)
668 /* If defined, a C expression to compute the alignment given to a
669 constant that is being placed in memory. EXP is the constant
670 and ALIGN is the alignment that the object would ordinarily have.
671 The value of this macro is used instead of that alignment to align
674 If this macro is not defined, then ALIGN is used.
676 The typical use of this macro is to increase alignment for string
677 constants to be word aligned so that `strcpy' calls that copy
678 constants can be done inline. */
680 #define CONSTANT_ALIGNMENT(EXP, ALIGN) ix86_constant_alignment ((EXP), (ALIGN))
682 /* If defined, a C expression to compute the alignment for a static
683 variable. TYPE is the data type, and ALIGN is the alignment that
684 the object would ordinarily have. The value of this macro is used
685 instead of that alignment to align the object.
687 If this macro is not defined, then ALIGN is used.
689 One use of this macro is to increase alignment of medium-size
690 data to make it all fit in fewer cache lines. Another is to
691 cause character arrays to be word-aligned so that `strcpy' calls
692 that copy constants to character arrays can be done inline. */
694 #define DATA_ALIGNMENT(TYPE, ALIGN) ix86_data_alignment ((TYPE), (ALIGN))
696 /* If defined, a C expression to compute the alignment for a local
697 variable. TYPE is the data type, and ALIGN is the alignment that
698 the object would ordinarily have. The value of this macro is used
699 instead of that alignment to align the object.
701 If this macro is not defined, then ALIGN is used.
703 One use of this macro is to increase alignment of medium-size
704 data to make it all fit in fewer cache lines. */
706 #define LOCAL_ALIGNMENT(TYPE, ALIGN) ix86_local_alignment ((TYPE), (ALIGN))
708 /* If defined, a C expression that gives the alignment boundary, in
709 bits, of an argument with the specified mode and type. If it is
710 not defined, `PARM_BOUNDARY' is used for all arguments. */
712 #define FUNCTION_ARG_BOUNDARY(MODE, TYPE) \
713 ix86_function_arg_boundary ((MODE), (TYPE))
715 /* Set this nonzero if move instructions will actually fail to work
716 when given unaligned data. */
717 #define STRICT_ALIGNMENT 0
719 /* If bit field type is int, don't let it cross an int,
720 and give entire struct the alignment of an int. */
721 /* Required on the 386 since it doesn't have bit-field insns. */
722 #define PCC_BITFIELD_TYPE_MATTERS 1
724 /* Standard register usage. */
726 /* This processor has special stack-like registers. See reg-stack.c
730 #define IS_STACK_MODE(MODE) \
731 (((MODE) == SFmode && (!TARGET_SSE || !TARGET_SSE_MATH)) \
732 || ((MODE) == DFmode && (!TARGET_SSE2 || !TARGET_SSE_MATH)) \
735 /* Number of actual hardware registers.
736 The hardware registers are assigned numbers for the compiler
737 from 0 to just below FIRST_PSEUDO_REGISTER.
738 All registers that the compiler knows about must be given numbers,
739 even those that are not normally considered general registers.
741 In the 80386 we give the 8 general purpose registers the numbers 0-7.
742 We number the floating point registers 8-15.
743 Note that registers 0-7 can be accessed as a short or int,
744 while only 0-3 may be used with byte `mov' instructions.
746 Reg 16 does not correspond to any hardware register, but instead
747 appears in the RTL as an argument pointer prior to reload, and is
748 eliminated during reloading in favor of either the stack or frame
751 #define FIRST_PSEUDO_REGISTER 53
753 /* Number of hardware registers that go into the DWARF-2 unwind info.
754 If not defined, equals FIRST_PSEUDO_REGISTER. */
756 #define DWARF_FRAME_REGISTERS 17
758 /* 1 for registers that have pervasive standard uses
759 and are not available for the register allocator.
760 On the 80386, the stack pointer is such, as is the arg pointer.
762 The value is zero if the register is not fixed on either 32 or
763 64 bit targets, one if the register if fixed on both 32 and 64
764 bit targets, two if it is only fixed on 32bit targets and three
765 if its only fixed on 64bit targets.
766 Proper values are computed in the CONDITIONAL_REGISTER_USAGE.
768 #define FIXED_REGISTERS \
769 /*ax,dx,cx,bx,si,di,bp,sp,st,st1,st2,st3,st4,st5,st6,st7*/ \
770 { 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, \
771 /*arg,flags,fpsr,dir,frame*/ \
773 /*xmm0,xmm1,xmm2,xmm3,xmm4,xmm5,xmm6,xmm7*/ \
774 0, 0, 0, 0, 0, 0, 0, 0, \
775 /*mmx0,mmx1,mmx2,mmx3,mmx4,mmx5,mmx6,mmx7*/ \
776 0, 0, 0, 0, 0, 0, 0, 0, \
777 /* r8, r9, r10, r11, r12, r13, r14, r15*/ \
778 2, 2, 2, 2, 2, 2, 2, 2, \
779 /*xmm8,xmm9,xmm10,xmm11,xmm12,xmm13,xmm14,xmm15*/ \
780 2, 2, 2, 2, 2, 2, 2, 2}
783 /* 1 for registers not available across function calls.
784 These must include the FIXED_REGISTERS and also any
785 registers that can be used without being saved.
786 The latter must include the registers where values are returned
787 and the register where structure-value addresses are passed.
788 Aside from that, you can include as many other registers as you like.
790 The value is zero if the register is not call used on either 32 or
791 64 bit targets, one if the register if call used on both 32 and 64
792 bit targets, two if it is only call used on 32bit targets and three
793 if its only call used on 64bit targets.
794 Proper values are computed in the CONDITIONAL_REGISTER_USAGE.
796 #define CALL_USED_REGISTERS \
797 /*ax,dx,cx,bx,si,di,bp,sp,st,st1,st2,st3,st4,st5,st6,st7*/ \
798 { 1, 1, 1, 0, 3, 3, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
799 /*arg,flags,fpsr,dir,frame*/ \
801 /*xmm0,xmm1,xmm2,xmm3,xmm4,xmm5,xmm6,xmm7*/ \
802 1, 1, 1, 1, 1, 1, 1, 1, \
803 /*mmx0,mmx1,mmx2,mmx3,mmx4,mmx5,mmx6,mmx7*/ \
804 1, 1, 1, 1, 1, 1, 1, 1, \
805 /* r8, r9, r10, r11, r12, r13, r14, r15*/ \
806 1, 1, 1, 1, 2, 2, 2, 2, \
807 /*xmm8,xmm9,xmm10,xmm11,xmm12,xmm13,xmm14,xmm15*/ \
808 1, 1, 1, 1, 1, 1, 1, 1} \
810 /* Order in which to allocate registers. Each register must be
811 listed once, even those in FIXED_REGISTERS. List frame pointer
812 late and fixed registers last. Note that, in general, we prefer
813 registers listed in CALL_USED_REGISTERS, keeping the others
814 available for storage of persistent values.
816 The ORDER_REGS_FOR_LOCAL_ALLOC actually overwrite the order,
817 so this is just empty initializer for array. */
819 #define REG_ALLOC_ORDER \
820 { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17,\
821 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, \
822 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, \
825 /* ORDER_REGS_FOR_LOCAL_ALLOC is a macro which permits reg_alloc_order
826 to be rearranged based on a particular function. When using sse math,
827 we want to allocate SSE before x87 registers and vice vera. */
829 #define ORDER_REGS_FOR_LOCAL_ALLOC x86_order_regs_for_local_alloc ()
832 /* Macro to conditionally modify fixed_regs/call_used_regs. */
833 #define CONDITIONAL_REGISTER_USAGE \
836 for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) \
838 if (fixed_regs[i] > 1) \
839 fixed_regs[i] = (fixed_regs[i] == (TARGET_64BIT ? 3 : 2)); \
840 if (call_used_regs[i] > 1) \
841 call_used_regs[i] = (call_used_regs[i] \
842 == (TARGET_64BIT ? 3 : 2)); \
844 if (PIC_OFFSET_TABLE_REGNUM != INVALID_REGNUM) \
846 fixed_regs[PIC_OFFSET_TABLE_REGNUM] = 1; \
847 call_used_regs[PIC_OFFSET_TABLE_REGNUM] = 1; \
852 for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) \
853 if (TEST_HARD_REG_BIT (reg_class_contents[(int)MMX_REGS], i)) \
854 fixed_regs[i] = call_used_regs[i] = 1, reg_names[i] = ""; \
859 for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) \
860 if (TEST_HARD_REG_BIT (reg_class_contents[(int)SSE_REGS], i)) \
861 fixed_regs[i] = call_used_regs[i] = 1, reg_names[i] = ""; \
863 if (! TARGET_80387 && ! TARGET_FLOAT_RETURNS_IN_80387) \
867 COPY_HARD_REG_SET (x, reg_class_contents[(int)FLOAT_REGS]); \
868 for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) \
869 if (TEST_HARD_REG_BIT (x, i)) \
870 fixed_regs[i] = call_used_regs[i] = 1, reg_names[i] = ""; \
872 if (! TARGET_64BIT) \
875 for (i = FIRST_REX_INT_REG; i <= LAST_REX_INT_REG; i++) \
877 for (i = FIRST_REX_SSE_REG; i <= LAST_REX_SSE_REG; i++) \
882 /* Return number of consecutive hard regs needed starting at reg REGNO
883 to hold something of mode MODE.
884 This is ordinarily the length in words of a value of mode MODE
885 but can be less for certain modes in special long registers.
887 Actually there are no two word move instructions for consecutive
888 registers. And only registers 0-3 may have mov byte instructions
892 #define HARD_REGNO_NREGS(REGNO, MODE) \
893 (FP_REGNO_P (REGNO) || SSE_REGNO_P (REGNO) || MMX_REGNO_P (REGNO) \
894 ? (COMPLEX_MODE_P (MODE) ? 2 : 1) \
895 : ((MODE) == XFmode \
896 ? (TARGET_64BIT ? 2 : 3) \
898 ? (TARGET_64BIT ? 4 : 6) \
899 : ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD)))
901 #define HARD_REGNO_NREGS_HAS_PADDING(REGNO, MODE) \
902 ((TARGET_128BIT_LONG_DOUBLE && !TARGET_64BIT) \
903 ? (FP_REGNO_P (REGNO) || SSE_REGNO_P (REGNO) || MMX_REGNO_P (REGNO) \
905 : ((MODE) == XFmode || (MODE) == XCmode)) \
908 #define HARD_REGNO_NREGS_WITH_PADDING(REGNO, MODE) ((MODE) == XFmode ? 4 : 8)
910 #define VALID_SSE2_REG_MODE(MODE) \
911 ((MODE) == V16QImode || (MODE) == V8HImode || (MODE) == V2DFmode \
912 || (MODE) == V2DImode || (MODE) == DFmode)
914 #define VALID_SSE_REG_MODE(MODE) \
915 ((MODE) == TImode || (MODE) == V4SFmode || (MODE) == V4SImode \
916 || (MODE) == SFmode || (MODE) == TFmode)
918 #define VALID_MMX_REG_MODE_3DNOW(MODE) \
919 ((MODE) == V2SFmode || (MODE) == SFmode)
921 #define VALID_MMX_REG_MODE(MODE) \
922 ((MODE) == DImode || (MODE) == V8QImode || (MODE) == V4HImode \
923 || (MODE) == V2SImode || (MODE) == SImode)
925 /* ??? No autovectorization into MMX or 3DNOW until we can reliably
926 place emms and femms instructions. */
927 #define UNITS_PER_SIMD_WORD (TARGET_SSE ? 16 : UNITS_PER_WORD)
929 #define VALID_FP_MODE_P(MODE) \
930 ((MODE) == SFmode || (MODE) == DFmode || (MODE) == XFmode \
931 || (MODE) == SCmode || (MODE) == DCmode || (MODE) == XCmode) \
933 #define VALID_INT_MODE_P(MODE) \
934 ((MODE) == QImode || (MODE) == HImode || (MODE) == SImode \
935 || (MODE) == DImode \
936 || (MODE) == CQImode || (MODE) == CHImode || (MODE) == CSImode \
937 || (MODE) == CDImode \
938 || (TARGET_64BIT && ((MODE) == TImode || (MODE) == CTImode \
939 || (MODE) == TFmode || (MODE) == TCmode)))
941 /* Return true for modes passed in SSE registers. */
942 #define SSE_REG_MODE_P(MODE) \
943 ((MODE) == TImode || (MODE) == V16QImode || (MODE) == TFmode \
944 || (MODE) == V8HImode || (MODE) == V2DFmode || (MODE) == V2DImode \
945 || (MODE) == V4SFmode || (MODE) == V4SImode)
947 /* Value is 1 if hard register REGNO can hold a value of machine-mode MODE. */
949 #define HARD_REGNO_MODE_OK(REGNO, MODE) \
950 ix86_hard_regno_mode_ok ((REGNO), (MODE))
952 /* Value is 1 if it is a good idea to tie two pseudo registers
953 when one has mode MODE1 and one has mode MODE2.
954 If HARD_REGNO_MODE_OK could produce different values for MODE1 and MODE2,
955 for any hard reg, then this must be 0 for correct output. */
957 #define MODES_TIEABLE_P(MODE1, MODE2) ix86_modes_tieable_p (MODE1, MODE2)
959 /* It is possible to write patterns to move flags; but until someone
961 #define AVOID_CCMODE_COPIES
963 /* Specify the modes required to caller save a given hard regno.
964 We do this on i386 to prevent flags from being saved at all.
966 Kill any attempts to combine saving of modes. */
968 #define HARD_REGNO_CALLER_SAVE_MODE(REGNO, NREGS, MODE) \
969 (CC_REGNO_P (REGNO) ? VOIDmode \
970 : (MODE) == VOIDmode && (NREGS) != 1 ? VOIDmode \
971 : (MODE) == VOIDmode ? choose_hard_reg_mode ((REGNO), (NREGS), false)\
972 : (MODE) == HImode && !TARGET_PARTIAL_REG_STALL ? SImode \
973 : (MODE) == QImode && (REGNO) >= 4 && !TARGET_64BIT ? SImode \
975 /* Specify the registers used for certain standard purposes.
976 The values of these macros are register numbers. */
978 /* on the 386 the pc register is %eip, and is not usable as a general
979 register. The ordinary mov instructions won't work */
980 /* #define PC_REGNUM */
982 /* Register to use for pushing function arguments. */
983 #define STACK_POINTER_REGNUM 7
985 /* Base register for access to local variables of the function. */
986 #define HARD_FRAME_POINTER_REGNUM 6
988 /* Base register for access to local variables of the function. */
989 #define FRAME_POINTER_REGNUM 20
991 /* First floating point reg */
992 #define FIRST_FLOAT_REG 8
994 /* First & last stack-like regs */
995 #define FIRST_STACK_REG FIRST_FLOAT_REG
996 #define LAST_STACK_REG (FIRST_FLOAT_REG + 7)
998 #define FIRST_SSE_REG (FRAME_POINTER_REGNUM + 1)
999 #define LAST_SSE_REG (FIRST_SSE_REG + 7)
1001 #define FIRST_MMX_REG (LAST_SSE_REG + 1)
1002 #define LAST_MMX_REG (FIRST_MMX_REG + 7)
1004 #define FIRST_REX_INT_REG (LAST_MMX_REG + 1)
1005 #define LAST_REX_INT_REG (FIRST_REX_INT_REG + 7)
1007 #define FIRST_REX_SSE_REG (LAST_REX_INT_REG + 1)
1008 #define LAST_REX_SSE_REG (FIRST_REX_SSE_REG + 7)
1010 /* Value should be nonzero if functions must have frame pointers.
1011 Zero means the frame pointer need not be set up (and parms
1012 may be accessed via the stack pointer) in functions that seem suitable.
1013 This is computed in `reload', in reload1.c. */
1014 #define FRAME_POINTER_REQUIRED ix86_frame_pointer_required ()
1016 /* Override this in other tm.h files to cope with various OS lossage
1017 requiring a frame pointer. */
1018 #ifndef SUBTARGET_FRAME_POINTER_REQUIRED
1019 #define SUBTARGET_FRAME_POINTER_REQUIRED 0
1022 /* Make sure we can access arbitrary call frames. */
1023 #define SETUP_FRAME_ADDRESSES() ix86_setup_frame_addresses ()
1025 /* Base register for access to arguments of the function. */
1026 #define ARG_POINTER_REGNUM 16
1028 /* Register in which static-chain is passed to a function.
1029 We do use ECX as static chain register for 32 bit ABI. On the
1030 64bit ABI, ECX is an argument register, so we use R10 instead. */
1031 #define STATIC_CHAIN_REGNUM (TARGET_64BIT ? FIRST_REX_INT_REG + 10 - 8 : 2)
1033 /* Register to hold the addressing base for position independent
1034 code access to data items. We don't use PIC pointer for 64bit
1035 mode. Define the regnum to dummy value to prevent gcc from
1036 pessimizing code dealing with EBX.
1038 To avoid clobbering a call-saved register unnecessarily, we renumber
1039 the pic register when possible. The change is visible after the
1040 prologue has been emitted. */
1042 #define REAL_PIC_OFFSET_TABLE_REGNUM 3
1044 #define PIC_OFFSET_TABLE_REGNUM \
1045 ((TARGET_64BIT && ix86_cmodel == CM_SMALL_PIC) \
1046 || !flag_pic ? INVALID_REGNUM \
1047 : reload_completed ? REGNO (pic_offset_table_rtx) \
1048 : REAL_PIC_OFFSET_TABLE_REGNUM)
1050 #define GOT_SYMBOL_NAME "_GLOBAL_OFFSET_TABLE_"
1052 /* A C expression which can inhibit the returning of certain function
1053 values in registers, based on the type of value. A nonzero value
1054 says to return the function value in memory, just as large
1055 structures are always returned. Here TYPE will be a C expression
1056 of type `tree', representing the data type of the value.
1058 Note that values of mode `BLKmode' must be explicitly handled by
1059 this macro. Also, the option `-fpcc-struct-return' takes effect
1060 regardless of this macro. On most systems, it is possible to
1061 leave the macro undefined; this causes a default definition to be
1062 used, whose value is the constant 1 for `BLKmode' values, and 0
1065 Do not use this macro to indicate that structures and unions
1066 should always be returned in memory. You should instead use
1067 `DEFAULT_PCC_STRUCT_RETURN' to indicate this. */
1069 #define RETURN_IN_MEMORY(TYPE) \
1070 ix86_return_in_memory (TYPE)
1072 /* This is overridden by <cygwin.h>. */
1073 #define MS_AGGREGATE_RETURN 0
1075 /* This is overridden by <netware.h>. */
1076 #define KEEP_AGGREGATE_RETURN_POINTER 0
1078 /* Define the classes of registers for register constraints in the
1079 machine description. Also define ranges of constants.
1081 One of the classes must always be named ALL_REGS and include all hard regs.
1082 If there is more than one class, another class must be named NO_REGS
1083 and contain no registers.
1085 The name GENERAL_REGS must be the name of a class (or an alias for
1086 another name such as ALL_REGS). This is the class of registers
1087 that is allowed by "g" or "r" in a register constraint.
1088 Also, registers outside this class are allocated only when
1089 instructions express preferences for them.
1091 The classes must be numbered in nondecreasing order; that is,
1092 a larger-numbered class must never be contained completely
1093 in a smaller-numbered class.
1095 For any two classes, it is very desirable that there be another
1096 class that represents their union.
1098 It might seem that class BREG is unnecessary, since no useful 386
1099 opcode needs reg %ebx. But some systems pass args to the OS in ebx,
1100 and the "b" register constraint is useful in asms for syscalls.
1102 The flags and fpsr registers are in no class. */
1107 AREG, DREG, CREG, BREG, SIREG, DIREG,
1108 AD_REGS, /* %eax/%edx for DImode */
1109 Q_REGS, /* %eax %ebx %ecx %edx */
1110 NON_Q_REGS, /* %esi %edi %ebp %esp */
1111 INDEX_REGS, /* %eax %ebx %ecx %edx %esi %edi %ebp */
1112 LEGACY_REGS, /* %eax %ebx %ecx %edx %esi %edi %ebp %esp */
1113 GENERAL_REGS, /* %eax %ebx %ecx %edx %esi %edi %ebp %esp %r8 - %r15*/
1114 FP_TOP_REG, FP_SECOND_REG, /* %st(0) %st(1) */
1124 ALL_REGS, LIM_REG_CLASSES
1127 #define N_REG_CLASSES ((int) LIM_REG_CLASSES)
1129 #define INTEGER_CLASS_P(CLASS) \
1130 reg_class_subset_p ((CLASS), GENERAL_REGS)
1131 #define FLOAT_CLASS_P(CLASS) \
1132 reg_class_subset_p ((CLASS), FLOAT_REGS)
1133 #define SSE_CLASS_P(CLASS) \
1134 ((CLASS) == SSE_REGS)
1135 #define MMX_CLASS_P(CLASS) \
1136 ((CLASS) == MMX_REGS)
1137 #define MAYBE_INTEGER_CLASS_P(CLASS) \
1138 reg_classes_intersect_p ((CLASS), GENERAL_REGS)
1139 #define MAYBE_FLOAT_CLASS_P(CLASS) \
1140 reg_classes_intersect_p ((CLASS), FLOAT_REGS)
1141 #define MAYBE_SSE_CLASS_P(CLASS) \
1142 reg_classes_intersect_p (SSE_REGS, (CLASS))
1143 #define MAYBE_MMX_CLASS_P(CLASS) \
1144 reg_classes_intersect_p (MMX_REGS, (CLASS))
1146 #define Q_CLASS_P(CLASS) \
1147 reg_class_subset_p ((CLASS), Q_REGS)
1149 /* Give names of register classes as strings for dump file. */
1151 #define REG_CLASS_NAMES \
1153 "AREG", "DREG", "CREG", "BREG", \
1156 "Q_REGS", "NON_Q_REGS", \
1160 "FP_TOP_REG", "FP_SECOND_REG", \
1164 "FP_TOP_SSE_REGS", \
1165 "FP_SECOND_SSE_REGS", \
1169 "FLOAT_INT_SSE_REGS", \
1172 /* Define which registers fit in which classes.
1173 This is an initializer for a vector of HARD_REG_SET
1174 of length N_REG_CLASSES. */
1176 #define REG_CLASS_CONTENTS \
1178 { 0x01, 0x0 }, { 0x02, 0x0 }, /* AREG, DREG */ \
1179 { 0x04, 0x0 }, { 0x08, 0x0 }, /* CREG, BREG */ \
1180 { 0x10, 0x0 }, { 0x20, 0x0 }, /* SIREG, DIREG */ \
1181 { 0x03, 0x0 }, /* AD_REGS */ \
1182 { 0x0f, 0x0 }, /* Q_REGS */ \
1183 { 0x1100f0, 0x1fe0 }, /* NON_Q_REGS */ \
1184 { 0x7f, 0x1fe0 }, /* INDEX_REGS */ \
1185 { 0x1100ff, 0x0 }, /* LEGACY_REGS */ \
1186 { 0x1100ff, 0x1fe0 }, /* GENERAL_REGS */ \
1187 { 0x100, 0x0 }, { 0x0200, 0x0 },/* FP_TOP_REG, FP_SECOND_REG */\
1188 { 0xff00, 0x0 }, /* FLOAT_REGS */ \
1189 { 0x1fe00000,0x1fe000 }, /* SSE_REGS */ \
1190 { 0xe0000000, 0x1f }, /* MMX_REGS */ \
1191 { 0x1fe00100,0x1fe000 }, /* FP_TOP_SSE_REG */ \
1192 { 0x1fe00200,0x1fe000 }, /* FP_SECOND_SSE_REG */ \
1193 { 0x1fe0ff00,0x1fe000 }, /* FLOAT_SSE_REGS */ \
1194 { 0x1ffff, 0x1fe0 }, /* FLOAT_INT_REGS */ \
1195 { 0x1fe100ff,0x1fffe0 }, /* INT_SSE_REGS */ \
1196 { 0x1fe1ffff,0x1fffe0 }, /* FLOAT_INT_SSE_REGS */ \
1197 { 0xffffffff,0x1fffff } \
1200 /* The same information, inverted:
1201 Return the class number of the smallest class containing
1202 reg number REGNO. This could be a conditional expression
1203 or could index an array. */
1205 #define REGNO_REG_CLASS(REGNO) (regclass_map[REGNO])
1207 /* When defined, the compiler allows registers explicitly used in the
1208 rtl to be used as spill registers but prevents the compiler from
1209 extending the lifetime of these registers. */
1211 #define SMALL_REGISTER_CLASSES 1
1213 #define QI_REG_P(X) \
1214 (REG_P (X) && REGNO (X) < 4)
1216 #define GENERAL_REGNO_P(N) \
1217 ((N) < 8 || REX_INT_REGNO_P (N))
1219 #define GENERAL_REG_P(X) \
1220 (REG_P (X) && GENERAL_REGNO_P (REGNO (X)))
1222 #define ANY_QI_REG_P(X) (TARGET_64BIT ? GENERAL_REG_P(X) : QI_REG_P (X))
1224 #define NON_QI_REG_P(X) \
1225 (REG_P (X) && REGNO (X) >= 4 && REGNO (X) < FIRST_PSEUDO_REGISTER)
1227 #define REX_INT_REGNO_P(N) ((N) >= FIRST_REX_INT_REG && (N) <= LAST_REX_INT_REG)
1228 #define REX_INT_REG_P(X) (REG_P (X) && REX_INT_REGNO_P (REGNO (X)))
1230 #define FP_REG_P(X) (REG_P (X) && FP_REGNO_P (REGNO (X)))
1231 #define FP_REGNO_P(N) ((N) >= FIRST_STACK_REG && (N) <= LAST_STACK_REG)
1232 #define ANY_FP_REG_P(X) (REG_P (X) && ANY_FP_REGNO_P (REGNO (X)))
1233 #define ANY_FP_REGNO_P(N) (FP_REGNO_P (N) || SSE_REGNO_P (N))
1235 #define SSE_REGNO_P(N) \
1236 (((N) >= FIRST_SSE_REG && (N) <= LAST_SSE_REG) \
1237 || ((N) >= FIRST_REX_SSE_REG && (N) <= LAST_REX_SSE_REG))
1239 #define REX_SSE_REGNO_P(N) \
1240 ((N) >= FIRST_REX_SSE_REG && (N) <= LAST_REX_SSE_REG)
1242 #define SSE_REGNO(N) \
1243 ((N) < 8 ? FIRST_SSE_REG + (N) : FIRST_REX_SSE_REG + (N) - 8)
1244 #define SSE_REG_P(N) (REG_P (N) && SSE_REGNO_P (REGNO (N)))
1246 #define SSE_FLOAT_MODE_P(MODE) \
1247 ((TARGET_SSE && (MODE) == SFmode) || (TARGET_SSE2 && (MODE) == DFmode))
1249 #define MMX_REGNO_P(N) ((N) >= FIRST_MMX_REG && (N) <= LAST_MMX_REG)
1250 #define MMX_REG_P(XOP) (REG_P (XOP) && MMX_REGNO_P (REGNO (XOP)))
1252 #define STACK_REG_P(XOP) \
1254 REGNO (XOP) >= FIRST_STACK_REG && \
1255 REGNO (XOP) <= LAST_STACK_REG)
1257 #define NON_STACK_REG_P(XOP) (REG_P (XOP) && ! STACK_REG_P (XOP))
1259 #define STACK_TOP_P(XOP) (REG_P (XOP) && REGNO (XOP) == FIRST_STACK_REG)
1261 #define CC_REG_P(X) (REG_P (X) && CC_REGNO_P (REGNO (X)))
1262 #define CC_REGNO_P(X) ((X) == FLAGS_REG || (X) == FPSR_REG)
1264 /* The class value for index registers, and the one for base regs. */
1266 #define INDEX_REG_CLASS INDEX_REGS
1267 #define BASE_REG_CLASS GENERAL_REGS
1269 /* Place additional restrictions on the register class to use when it
1270 is necessary to be able to hold a value of mode MODE in a reload
1271 register for which class CLASS would ordinarily be used. */
1273 #define LIMIT_RELOAD_CLASS(MODE, CLASS) \
1274 ((MODE) == QImode && !TARGET_64BIT \
1275 && ((CLASS) == ALL_REGS || (CLASS) == GENERAL_REGS \
1276 || (CLASS) == LEGACY_REGS || (CLASS) == INDEX_REGS) \
1279 /* Given an rtx X being reloaded into a reg required to be
1280 in class CLASS, return the class of reg to actually use.
1281 In general this is just CLASS; but on some machines
1282 in some cases it is preferable to use a more restrictive class.
1283 On the 80386 series, we prevent floating constants from being
1284 reloaded into floating registers (since no move-insn can do that)
1285 and we ensure that QImodes aren't reloaded into the esi or edi reg. */
1287 /* Put float CONST_DOUBLE in the constant pool instead of fp regs.
1288 QImode must go into class Q_REGS.
1289 Narrow ALL_REGS to GENERAL_REGS. This supports allowing movsf and
1290 movdf to do mem-to-mem moves through integer regs. */
1292 #define PREFERRED_RELOAD_CLASS(X, CLASS) \
1293 ix86_preferred_reload_class ((X), (CLASS))
1295 /* Discourage putting floating-point values in SSE registers unless
1296 SSE math is being used, and likewise for the 387 registers. */
1298 #define PREFERRED_OUTPUT_RELOAD_CLASS(X, CLASS) \
1299 ix86_preferred_output_reload_class ((X), (CLASS))
1301 /* If we are copying between general and FP registers, we need a memory
1302 location. The same is true for SSE and MMX registers. */
1303 #define SECONDARY_MEMORY_NEEDED(CLASS1, CLASS2, MODE) \
1304 ix86_secondary_memory_needed ((CLASS1), (CLASS2), (MODE), 1)
1306 /* QImode spills from non-QI registers need a scratch. This does not
1307 happen often -- the only example so far requires an uninitialized
1310 #define SECONDARY_OUTPUT_RELOAD_CLASS(CLASS, MODE, OUT) \
1311 (((CLASS) == GENERAL_REGS || (CLASS) == LEGACY_REGS \
1312 || (CLASS) == INDEX_REGS) && !TARGET_64BIT && (MODE) == QImode \
1315 /* Return the maximum number of consecutive registers
1316 needed to represent mode MODE in a register of class CLASS. */
1317 /* On the 80386, this is the size of MODE in words,
1318 except in the FP regs, where a single reg is always enough. */
1319 #define CLASS_MAX_NREGS(CLASS, MODE) \
1320 (!MAYBE_INTEGER_CLASS_P (CLASS) \
1321 ? (COMPLEX_MODE_P (MODE) ? 2 : 1) \
1322 : (((((MODE) == XFmode ? 12 : GET_MODE_SIZE (MODE))) \
1323 + UNITS_PER_WORD - 1) / UNITS_PER_WORD))
1325 /* A C expression whose value is nonzero if pseudos that have been
1326 assigned to registers of class CLASS would likely be spilled
1327 because registers of CLASS are needed for spill registers.
1329 The default value of this macro returns 1 if CLASS has exactly one
1330 register and zero otherwise. On most machines, this default
1331 should be used. Only define this macro to some other expression
1332 if pseudo allocated by `local-alloc.c' end up in memory because
1333 their hard registers were needed for spill registers. If this
1334 macro returns nonzero for those classes, those pseudos will only
1335 be allocated by `global.c', which knows how to reallocate the
1336 pseudo to another register. If there would not be another
1337 register available for reallocation, you should not change the
1338 definition of this macro since the only effect of such a
1339 definition would be to slow down register allocation. */
1341 #define CLASS_LIKELY_SPILLED_P(CLASS) \
1342 (((CLASS) == AREG) \
1343 || ((CLASS) == DREG) \
1344 || ((CLASS) == CREG) \
1345 || ((CLASS) == BREG) \
1346 || ((CLASS) == AD_REGS) \
1347 || ((CLASS) == SIREG) \
1348 || ((CLASS) == DIREG) \
1349 || ((CLASS) == FP_TOP_REG) \
1350 || ((CLASS) == FP_SECOND_REG))
1352 /* Return a class of registers that cannot change FROM mode to TO mode. */
1354 #define CANNOT_CHANGE_MODE_CLASS(FROM, TO, CLASS) \
1355 ix86_cannot_change_mode_class (FROM, TO, CLASS)
1357 /* Stack layout; function entry, exit and calling. */
1359 /* Define this if pushing a word on the stack
1360 makes the stack pointer a smaller address. */
1361 #define STACK_GROWS_DOWNWARD
1363 /* Define this to nonzero if the nominal address of the stack frame
1364 is at the high-address end of the local variables;
1365 that is, each additional local variable allocated
1366 goes at a more negative offset in the frame. */
1367 #define FRAME_GROWS_DOWNWARD 1
1369 /* Offset within stack frame to start allocating local variables at.
1370 If FRAME_GROWS_DOWNWARD, this is the offset to the END of the
1371 first local allocated. Otherwise, it is the offset to the BEGINNING
1372 of the first local allocated. */
1373 #define STARTING_FRAME_OFFSET 0
1375 /* If we generate an insn to push BYTES bytes,
1376 this says how many the stack pointer really advances by.
1377 On 386, we have pushw instruction that decrements by exactly 2 no
1378 matter what the position was, there is no pushb.
1379 But as CIE data alignment factor on this arch is -4, we need to make
1380 sure all stack pointer adjustments are in multiple of 4.
1382 For 64bit ABI we round up to 8 bytes.
1385 #define PUSH_ROUNDING(BYTES) \
1387 ? (((BYTES) + 7) & (-8)) \
1388 : (((BYTES) + 3) & (-4)))
1390 /* If defined, the maximum amount of space required for outgoing arguments will
1391 be computed and placed into the variable
1392 `current_function_outgoing_args_size'. No space will be pushed onto the
1393 stack for each call; instead, the function prologue should increase the stack
1394 frame size by this amount. */
1396 #define ACCUMULATE_OUTGOING_ARGS TARGET_ACCUMULATE_OUTGOING_ARGS
1398 /* If defined, a C expression whose value is nonzero when we want to use PUSH
1399 instructions to pass outgoing arguments. */
1401 #define PUSH_ARGS (TARGET_PUSH_ARGS && !ACCUMULATE_OUTGOING_ARGS)
1403 /* We want the stack and args grow in opposite directions, even if
1405 #define PUSH_ARGS_REVERSED 1
1407 /* Offset of first parameter from the argument pointer register value. */
1408 #define FIRST_PARM_OFFSET(FNDECL) 0
1410 /* Define this macro if functions should assume that stack space has been
1411 allocated for arguments even when their values are passed in registers.
1413 The value of this macro is the size, in bytes, of the area reserved for
1414 arguments passed in registers for the function represented by FNDECL.
1416 This space can be allocated by the caller, or be a part of the
1417 machine-dependent stack frame: `OUTGOING_REG_PARM_STACK_SPACE' says
1419 #define REG_PARM_STACK_SPACE(FNDECL) 0
1421 /* Value is the number of bytes of arguments automatically
1422 popped when returning from a subroutine call.
1423 FUNDECL is the declaration node of the function (as a tree),
1424 FUNTYPE is the data type of the function (as a tree),
1425 or for a library call it is an identifier node for the subroutine name.
1426 SIZE is the number of bytes of arguments passed on the stack.
1428 On the 80386, the RTD insn may be used to pop them if the number
1429 of args is fixed, but if the number is variable then the caller
1430 must pop them all. RTD can't be used for library calls now
1431 because the library is compiled with the Unix compiler.
1432 Use of RTD is a selectable option, since it is incompatible with
1433 standard Unix calling sequences. If the option is not selected,
1434 the caller must always pop the args.
1436 The attribute stdcall is equivalent to RTD on a per module basis. */
1438 #define RETURN_POPS_ARGS(FUNDECL, FUNTYPE, SIZE) \
1439 ix86_return_pops_args ((FUNDECL), (FUNTYPE), (SIZE))
1441 #define FUNCTION_VALUE_REGNO_P(N) \
1442 ix86_function_value_regno_p (N)
1444 /* Define how to find the value returned by a library function
1445 assuming the value has mode MODE. */
1447 #define LIBCALL_VALUE(MODE) \
1448 ix86_libcall_value (MODE)
1450 /* Define the size of the result block used for communication between
1451 untyped_call and untyped_return. The block contains a DImode value
1452 followed by the block used by fnsave and frstor. */
1454 #define APPLY_RESULT_SIZE (8+108)
1456 /* 1 if N is a possible register number for function argument passing. */
1457 #define FUNCTION_ARG_REGNO_P(N) ix86_function_arg_regno_p (N)
1459 /* Define a data type for recording info about an argument list
1460 during the scan of that argument list. This data type should
1461 hold all necessary information about the function itself
1462 and about the args processed so far, enough to enable macros
1463 such as FUNCTION_ARG to determine where the next arg should go. */
1465 typedef struct ix86_args {
1466 int words; /* # words passed so far */
1467 int nregs; /* # registers available for passing */
1468 int regno; /* next available register number */
1469 int fastcall; /* fastcall calling convention is used */
1470 int sse_words; /* # sse words passed so far */
1471 int sse_nregs; /* # sse registers available for passing */
1472 int warn_sse; /* True when we want to warn about SSE ABI. */
1473 int warn_mmx; /* True when we want to warn about MMX ABI. */
1474 int sse_regno; /* next available sse register number */
1475 int mmx_words; /* # mmx words passed so far */
1476 int mmx_nregs; /* # mmx registers available for passing */
1477 int mmx_regno; /* next available mmx register number */
1478 int maybe_vaarg; /* true for calls to possibly vardic fncts. */
1479 int float_in_sse; /* 1 if in 32-bit mode SFmode (2 for DFmode) should
1480 be passed in SSE registers. Otherwise 0. */
1483 /* Initialize a variable CUM of type CUMULATIVE_ARGS
1484 for a call to a function whose data type is FNTYPE.
1485 For a library call, FNTYPE is 0. */
1487 #define INIT_CUMULATIVE_ARGS(CUM, FNTYPE, LIBNAME, FNDECL, N_NAMED_ARGS) \
1488 init_cumulative_args (&(CUM), (FNTYPE), (LIBNAME), (FNDECL))
1490 /* Update the data in CUM to advance over an argument
1491 of mode MODE and data type TYPE.
1492 (TYPE is null for libcalls where that information may not be available.) */
1494 #define FUNCTION_ARG_ADVANCE(CUM, MODE, TYPE, NAMED) \
1495 function_arg_advance (&(CUM), (MODE), (TYPE), (NAMED))
1497 /* Define where to put the arguments to a function.
1498 Value is zero to push the argument on the stack,
1499 or a hard register in which to store the argument.
1501 MODE is the argument's machine mode.
1502 TYPE is the data type of the argument (as a tree).
1503 This is null for libcalls where that information may
1505 CUM is a variable of type CUMULATIVE_ARGS which gives info about
1506 the preceding args and about the function being called.
1507 NAMED is nonzero if this argument is a named parameter
1508 (otherwise it is an extra parameter matching an ellipsis). */
1510 #define FUNCTION_ARG(CUM, MODE, TYPE, NAMED) \
1511 function_arg (&(CUM), (MODE), (TYPE), (NAMED))
1513 /* Implement `va_start' for varargs and stdarg. */
1514 #define EXPAND_BUILTIN_VA_START(VALIST, NEXTARG) \
1515 ix86_va_start (VALIST, NEXTARG)
1517 #define TARGET_ASM_FILE_END ix86_file_end
1518 #define NEED_INDICATE_EXEC_STACK 0
1520 /* Output assembler code to FILE to increment profiler label # LABELNO
1521 for profiling a function entry. */
1523 #define FUNCTION_PROFILER(FILE, LABELNO) x86_function_profiler (FILE, LABELNO)
1525 #define MCOUNT_NAME "_mcount"
1527 #define PROFILE_COUNT_REGISTER "edx"
1529 /* EXIT_IGNORE_STACK should be nonzero if, when returning from a function,
1530 the stack pointer does not matter. The value is tested only in
1531 functions that have frame pointers.
1532 No definition is equivalent to always zero. */
1533 /* Note on the 386 it might be more efficient not to define this since
1534 we have to restore it ourselves from the frame pointer, in order to
1537 #define EXIT_IGNORE_STACK 1
1539 /* Output assembler code for a block containing the constant parts
1540 of a trampoline, leaving space for the variable parts. */
1542 /* On the 386, the trampoline contains two instructions:
1545 The trampoline is generated entirely at runtime. The operand of JMP
1546 is the address of FUNCTION relative to the instruction following the
1547 JMP (which is 5 bytes long). */
1549 /* Length in units of the trampoline for entering a nested function. */
1551 #define TRAMPOLINE_SIZE (TARGET_64BIT ? 23 : 10)
1553 /* Emit RTL insns to initialize the variable parts of a trampoline.
1554 FNADDR is an RTX for the address of the function's pure code.
1555 CXT is an RTX for the static chain value for the function. */
1557 #define INITIALIZE_TRAMPOLINE(TRAMP, FNADDR, CXT) \
1558 x86_initialize_trampoline ((TRAMP), (FNADDR), (CXT))
1560 /* Definitions for register eliminations.
1562 This is an array of structures. Each structure initializes one pair
1563 of eliminable registers. The "from" register number is given first,
1564 followed by "to". Eliminations of the same "from" register are listed
1565 in order of preference.
1567 There are two registers that can always be eliminated on the i386.
1568 The frame pointer and the arg pointer can be replaced by either the
1569 hard frame pointer or to the stack pointer, depending upon the
1570 circumstances. The hard frame pointer is not used before reload and
1571 so it is not eligible for elimination. */
1573 #define ELIMINABLE_REGS \
1574 {{ ARG_POINTER_REGNUM, STACK_POINTER_REGNUM}, \
1575 { ARG_POINTER_REGNUM, HARD_FRAME_POINTER_REGNUM}, \
1576 { FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM}, \
1577 { FRAME_POINTER_REGNUM, HARD_FRAME_POINTER_REGNUM}} \
1579 /* Given FROM and TO register numbers, say whether this elimination is
1580 allowed. Frame pointer elimination is automatically handled.
1582 All other eliminations are valid. */
1584 #define CAN_ELIMINATE(FROM, TO) \
1585 ((TO) == STACK_POINTER_REGNUM ? ! frame_pointer_needed : 1)
1587 /* Define the offset between two registers, one to be eliminated, and the other
1588 its replacement, at the start of a routine. */
1590 #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET) \
1591 ((OFFSET) = ix86_initial_elimination_offset ((FROM), (TO)))
1593 /* Addressing modes, and classification of registers for them. */
1595 /* Macros to check register numbers against specific register classes. */
1597 /* These assume that REGNO is a hard or pseudo reg number.
1598 They give nonzero only if REGNO is a hard reg of the suitable class
1599 or a pseudo reg currently allocated to a suitable hard reg.
1600 Since they use reg_renumber, they are safe only once reg_renumber
1601 has been allocated, which happens in local-alloc.c. */
1603 #define REGNO_OK_FOR_INDEX_P(REGNO) \
1604 ((REGNO) < STACK_POINTER_REGNUM \
1605 || (REGNO >= FIRST_REX_INT_REG \
1606 && (REGNO) <= LAST_REX_INT_REG) \
1607 || ((unsigned) reg_renumber[(REGNO)] >= FIRST_REX_INT_REG \
1608 && (unsigned) reg_renumber[(REGNO)] <= LAST_REX_INT_REG) \
1609 || (unsigned) reg_renumber[(REGNO)] < STACK_POINTER_REGNUM)
1611 #define REGNO_OK_FOR_BASE_P(REGNO) \
1612 ((REGNO) <= STACK_POINTER_REGNUM \
1613 || (REGNO) == ARG_POINTER_REGNUM \
1614 || (REGNO) == FRAME_POINTER_REGNUM \
1615 || (REGNO >= FIRST_REX_INT_REG \
1616 && (REGNO) <= LAST_REX_INT_REG) \
1617 || ((unsigned) reg_renumber[(REGNO)] >= FIRST_REX_INT_REG \
1618 && (unsigned) reg_renumber[(REGNO)] <= LAST_REX_INT_REG) \
1619 || (unsigned) reg_renumber[(REGNO)] <= STACK_POINTER_REGNUM)
1621 #define REGNO_OK_FOR_SIREG_P(REGNO) \
1622 ((REGNO) == 4 || reg_renumber[(REGNO)] == 4)
1623 #define REGNO_OK_FOR_DIREG_P(REGNO) \
1624 ((REGNO) == 5 || reg_renumber[(REGNO)] == 5)
1626 /* The macros REG_OK_FOR..._P assume that the arg is a REG rtx
1627 and check its validity for a certain class.
1628 We have two alternate definitions for each of them.
1629 The usual definition accepts all pseudo regs; the other rejects
1630 them unless they have been allocated suitable hard regs.
1631 The symbol REG_OK_STRICT causes the latter definition to be used.
1633 Most source files want to accept pseudo regs in the hope that
1634 they will get allocated to the class that the insn wants them to be in.
1635 Source files for reload pass need to be strict.
1636 After reload, it makes no difference, since pseudo regs have
1637 been eliminated by then. */
1640 /* Non strict versions, pseudos are ok. */
1641 #define REG_OK_FOR_INDEX_NONSTRICT_P(X) \
1642 (REGNO (X) < STACK_POINTER_REGNUM \
1643 || (REGNO (X) >= FIRST_REX_INT_REG \
1644 && REGNO (X) <= LAST_REX_INT_REG) \
1645 || REGNO (X) >= FIRST_PSEUDO_REGISTER)
1647 #define REG_OK_FOR_BASE_NONSTRICT_P(X) \
1648 (REGNO (X) <= STACK_POINTER_REGNUM \
1649 || REGNO (X) == ARG_POINTER_REGNUM \
1650 || REGNO (X) == FRAME_POINTER_REGNUM \
1651 || (REGNO (X) >= FIRST_REX_INT_REG \
1652 && REGNO (X) <= LAST_REX_INT_REG) \
1653 || REGNO (X) >= FIRST_PSEUDO_REGISTER)
1655 /* Strict versions, hard registers only */
1656 #define REG_OK_FOR_INDEX_STRICT_P(X) REGNO_OK_FOR_INDEX_P (REGNO (X))
1657 #define REG_OK_FOR_BASE_STRICT_P(X) REGNO_OK_FOR_BASE_P (REGNO (X))
1659 #ifndef REG_OK_STRICT
1660 #define REG_OK_FOR_INDEX_P(X) REG_OK_FOR_INDEX_NONSTRICT_P (X)
1661 #define REG_OK_FOR_BASE_P(X) REG_OK_FOR_BASE_NONSTRICT_P (X)
1664 #define REG_OK_FOR_INDEX_P(X) REG_OK_FOR_INDEX_STRICT_P (X)
1665 #define REG_OK_FOR_BASE_P(X) REG_OK_FOR_BASE_STRICT_P (X)
1668 /* GO_IF_LEGITIMATE_ADDRESS recognizes an RTL expression
1669 that is a valid memory address for an instruction.
1670 The MODE argument is the machine mode for the MEM expression
1671 that wants to use this address.
1673 The other macros defined here are used only in GO_IF_LEGITIMATE_ADDRESS,
1674 except for CONSTANT_ADDRESS_P which is usually machine-independent.
1676 See legitimize_pic_address in i386.c for details as to what
1677 constitutes a legitimate address when -fpic is used. */
1679 #define MAX_REGS_PER_ADDRESS 2
1681 #define CONSTANT_ADDRESS_P(X) constant_address_p (X)
1683 /* Nonzero if the constant value X is a legitimate general operand.
1684 It is given that X satisfies CONSTANT_P or is a CONST_DOUBLE. */
1686 #define LEGITIMATE_CONSTANT_P(X) legitimate_constant_p (X)
1688 #ifdef REG_OK_STRICT
1689 #define GO_IF_LEGITIMATE_ADDRESS(MODE, X, ADDR) \
1691 if (legitimate_address_p ((MODE), (X), 1)) \
1696 #define GO_IF_LEGITIMATE_ADDRESS(MODE, X, ADDR) \
1698 if (legitimate_address_p ((MODE), (X), 0)) \
1704 /* If defined, a C expression to determine the base term of address X.
1705 This macro is used in only one place: `find_base_term' in alias.c.
1707 It is always safe for this macro to not be defined. It exists so
1708 that alias analysis can understand machine-dependent addresses.
1710 The typical use of this macro is to handle addresses containing
1711 a label_ref or symbol_ref within an UNSPEC. */
1713 #define FIND_BASE_TERM(X) ix86_find_base_term (X)
1715 /* Try machine-dependent ways of modifying an illegitimate address
1716 to be legitimate. If we find one, return the new, valid address.
1717 This macro is used in only one place: `memory_address' in explow.c.
1719 OLDX is the address as it was before break_out_memory_refs was called.
1720 In some cases it is useful to look at this to decide what needs to be done.
1722 MODE and WIN are passed so that this macro can use
1723 GO_IF_LEGITIMATE_ADDRESS.
1725 It is always safe for this macro to do nothing. It exists to recognize
1726 opportunities to optimize the output.
1728 For the 80386, we handle X+REG by loading X into a register R and
1729 using R+REG. R will go in a general reg and indexing will be used.
1730 However, if REG is a broken-out memory address or multiplication,
1731 nothing needs to be done because REG can certainly go in a general reg.
1733 When -fpic is used, special handling is needed for symbolic references.
1734 See comments by legitimize_pic_address in i386.c for details. */
1736 #define LEGITIMIZE_ADDRESS(X, OLDX, MODE, WIN) \
1738 (X) = legitimize_address ((X), (OLDX), (MODE)); \
1739 if (memory_address_p ((MODE), (X))) \
1743 #define REWRITE_ADDRESS(X) rewrite_address (X)
1745 /* Nonzero if the constant value X is a legitimate general operand
1746 when generating PIC code. It is given that flag_pic is on and
1747 that X satisfies CONSTANT_P or is a CONST_DOUBLE. */
1749 #define LEGITIMATE_PIC_OPERAND_P(X) legitimate_pic_operand_p (X)
1751 #define SYMBOLIC_CONST(X) \
1752 (GET_CODE (X) == SYMBOL_REF \
1753 || GET_CODE (X) == LABEL_REF \
1754 || (GET_CODE (X) == CONST && symbolic_reference_mentioned_p (X)))
1756 /* Go to LABEL if ADDR (a legitimate address expression)
1757 has an effect that depends on the machine mode it is used for.
1758 On the 80386, only postdecrement and postincrement address depend thus
1759 (the amount of decrement or increment being the length of the operand). */
1760 #define GO_IF_MODE_DEPENDENT_ADDRESS(ADDR, LABEL) \
1762 if (GET_CODE (ADDR) == POST_INC \
1763 || GET_CODE (ADDR) == POST_DEC) \
1767 /* Max number of args passed in registers. If this is more than 3, we will
1768 have problems with ebx (register #4), since it is a caller save register and
1769 is also used as the pic register in ELF. So for now, don't allow more than
1770 3 registers to be passed in registers. */
1772 #define REGPARM_MAX (TARGET_64BIT ? 6 : 3)
1774 #define SSE_REGPARM_MAX (TARGET_64BIT ? 8 : (TARGET_SSE ? 3 : 0))
1776 #define MMX_REGPARM_MAX (TARGET_64BIT ? 0 : (TARGET_MMX ? 3 : 0))
1779 /* Specify the machine mode that this machine uses
1780 for the index in the tablejump instruction. */
1781 #define CASE_VECTOR_MODE (!TARGET_64BIT || flag_pic ? SImode : DImode)
1783 /* Define this as 1 if `char' should by default be signed; else as 0. */
1784 #define DEFAULT_SIGNED_CHAR 1
1786 /* Number of bytes moved into a data cache for a single prefetch operation. */
1787 #define PREFETCH_BLOCK ix86_cost->prefetch_block
1789 /* Number of prefetch operations that can be done in parallel. */
1790 #define SIMULTANEOUS_PREFETCHES ix86_cost->simultaneous_prefetches
1792 /* Max number of bytes we can move from memory to memory
1793 in one reasonably fast instruction. */
1796 /* MOVE_MAX_PIECES is the number of bytes at a time which we can
1797 move efficiently, as opposed to MOVE_MAX which is the maximum
1798 number of bytes we can move with a single instruction. */
1799 #define MOVE_MAX_PIECES (TARGET_64BIT ? 8 : 4)
1801 /* If a memory-to-memory move would take MOVE_RATIO or more simple
1802 move-instruction pairs, we will do a movmem or libcall instead.
1803 Increasing the value will always make code faster, but eventually
1804 incurs high cost in increased code size.
1806 If you don't define this, a reasonable default is used. */
1808 #define MOVE_RATIO (optimize_size ? 3 : ix86_cost->move_ratio)
1810 /* If a clear memory operation would take CLEAR_RATIO or more simple
1811 move-instruction sequences, we will do a clrmem or libcall instead. */
1813 #define CLEAR_RATIO (optimize_size ? 2 \
1814 : ix86_cost->move_ratio > 6 ? 6 : ix86_cost->move_ratio)
1816 /* Define if shifts truncate the shift count
1817 which implies one can omit a sign-extension or zero-extension
1818 of a shift count. */
1819 /* On i386, shifts do truncate the count. But bit opcodes don't. */
1821 /* #define SHIFT_COUNT_TRUNCATED */
1823 /* Value is 1 if truncating an integer of INPREC bits to OUTPREC bits
1824 is done just by pretending it is already truncated. */
1825 #define TRULY_NOOP_TRUNCATION(OUTPREC, INPREC) 1
1827 /* A macro to update M and UNSIGNEDP when an object whose type is
1828 TYPE and which has the specified mode and signedness is to be
1829 stored in a register. This macro is only called when TYPE is a
1832 On i386 it is sometimes useful to promote HImode and QImode
1833 quantities to SImode. The choice depends on target type. */
1835 #define PROMOTE_MODE(MODE, UNSIGNEDP, TYPE) \
1837 if (((MODE) == HImode && TARGET_PROMOTE_HI_REGS) \
1838 || ((MODE) == QImode && TARGET_PROMOTE_QI_REGS)) \
1842 /* Specify the machine mode that pointers have.
1843 After generation of rtl, the compiler makes no further distinction
1844 between pointers and any other objects of this machine mode. */
1845 #define Pmode (TARGET_64BIT ? DImode : SImode)
1847 /* A function address in a call instruction
1848 is a byte address (for indexing purposes)
1849 so give the MEM rtx a byte's mode. */
1850 #define FUNCTION_MODE QImode
1852 /* A C expression for the cost of moving data from a register in class FROM to
1853 one in class TO. The classes are expressed using the enumeration values
1854 such as `GENERAL_REGS'. A value of 2 is the default; other values are
1855 interpreted relative to that.
1857 It is not required that the cost always equal 2 when FROM is the same as TO;
1858 on some machines it is expensive to move between registers if they are not
1859 general registers. */
1861 #define REGISTER_MOVE_COST(MODE, CLASS1, CLASS2) \
1862 ix86_register_move_cost ((MODE), (CLASS1), (CLASS2))
1864 /* A C expression for the cost of moving data of mode M between a
1865 register and memory. A value of 2 is the default; this cost is
1866 relative to those in `REGISTER_MOVE_COST'.
1868 If moving between registers and memory is more expensive than
1869 between two registers, you should define this macro to express the
1872 #define MEMORY_MOVE_COST(MODE, CLASS, IN) \
1873 ix86_memory_move_cost ((MODE), (CLASS), (IN))
1875 /* A C expression for the cost of a branch instruction. A value of 1
1876 is the default; other values are interpreted relative to that. */
1878 #define BRANCH_COST ix86_branch_cost
1880 /* Define this macro as a C expression which is nonzero if accessing
1881 less than a word of memory (i.e. a `char' or a `short') is no
1882 faster than accessing a word of memory, i.e., if such access
1883 require more than one instruction or if there is no difference in
1884 cost between byte and (aligned) word loads.
1886 When this macro is not defined, the compiler will access a field by
1887 finding the smallest containing object; when it is defined, a
1888 fullword load will be used if alignment permits. Unless bytes
1889 accesses are faster than word accesses, using word accesses is
1890 preferable since it may eliminate subsequent memory access if
1891 subsequent accesses occur to other fields in the same word of the
1892 structure, but to different bytes. */
1894 #define SLOW_BYTE_ACCESS 0
1896 /* Nonzero if access to memory by shorts is slow and undesirable. */
1897 #define SLOW_SHORT_ACCESS 0
1899 /* Define this macro to be the value 1 if unaligned accesses have a
1900 cost many times greater than aligned accesses, for example if they
1901 are emulated in a trap handler.
1903 When this macro is nonzero, the compiler will act as if
1904 `STRICT_ALIGNMENT' were nonzero when generating code for block
1905 moves. This can cause significantly more instructions to be
1906 produced. Therefore, do not set this macro nonzero if unaligned
1907 accesses only add a cycle or two to the time for a memory access.
1909 If the value of this macro is always zero, it need not be defined. */
1911 /* #define SLOW_UNALIGNED_ACCESS(MODE, ALIGN) 0 */
1913 /* Define this macro if it is as good or better to call a constant
1914 function address than to call an address kept in a register.
1916 Desirable on the 386 because a CALL with a constant address is
1917 faster than one with a register address. */
1919 #define NO_FUNCTION_CSE
1921 /* Given a comparison code (EQ, NE, etc.) and the first operand of a COMPARE,
1922 return the mode to be used for the comparison.
1924 For floating-point equality comparisons, CCFPEQmode should be used.
1925 VOIDmode should be used in all other cases.
1927 For integer comparisons against zero, reduce to CCNOmode or CCZmode if
1928 possible, to allow for more combinations. */
1930 #define SELECT_CC_MODE(OP, X, Y) ix86_cc_mode ((OP), (X), (Y))
1932 /* Return nonzero if MODE implies a floating point inequality can be
1935 #define REVERSIBLE_CC_MODE(MODE) 1
1937 /* A C expression whose value is reversed condition code of the CODE for
1938 comparison done in CC_MODE mode. */
1939 #define REVERSE_CONDITION(CODE, MODE) ix86_reverse_condition ((CODE), (MODE))
1942 /* Control the assembler format that we output, to the extent
1943 this does not vary between assemblers. */
1945 /* How to refer to registers in assembler output.
1946 This sequence is indexed by compiler's hard-register-number (see above). */
1948 /* In order to refer to the first 8 regs as 32 bit regs, prefix an "e".
1949 For non floating point regs, the following are the HImode names.
1951 For float regs, the stack top is sometimes referred to as "%st(0)"
1952 instead of just "%st". PRINT_OPERAND handles this with the "y" code. */
1954 #define HI_REGISTER_NAMES \
1955 {"ax","dx","cx","bx","si","di","bp","sp", \
1956 "st","st(1)","st(2)","st(3)","st(4)","st(5)","st(6)","st(7)", \
1957 "argp", "flags", "fpsr", "dirflag", "frame", \
1958 "xmm0","xmm1","xmm2","xmm3","xmm4","xmm5","xmm6","xmm7", \
1959 "mm0", "mm1", "mm2", "mm3", "mm4", "mm5", "mm6", "mm7" , \
1960 "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", \
1961 "xmm8", "xmm9", "xmm10", "xmm11", "xmm12", "xmm13", "xmm14", "xmm15"}
1963 #define REGISTER_NAMES HI_REGISTER_NAMES
1965 /* Table of additional register names to use in user input. */
1967 #define ADDITIONAL_REGISTER_NAMES \
1968 { { "eax", 0 }, { "edx", 1 }, { "ecx", 2 }, { "ebx", 3 }, \
1969 { "esi", 4 }, { "edi", 5 }, { "ebp", 6 }, { "esp", 7 }, \
1970 { "rax", 0 }, { "rdx", 1 }, { "rcx", 2 }, { "rbx", 3 }, \
1971 { "rsi", 4 }, { "rdi", 5 }, { "rbp", 6 }, { "rsp", 7 }, \
1972 { "al", 0 }, { "dl", 1 }, { "cl", 2 }, { "bl", 3 }, \
1973 { "ah", 0 }, { "dh", 1 }, { "ch", 2 }, { "bh", 3 } }
1975 /* Note we are omitting these since currently I don't know how
1976 to get gcc to use these, since they want the same but different
1977 number as al, and ax.
1980 #define QI_REGISTER_NAMES \
1981 {"al", "dl", "cl", "bl", "sil", "dil", "bpl", "spl",}
1983 /* These parallel the array above, and can be used to access bits 8:15
1984 of regs 0 through 3. */
1986 #define QI_HIGH_REGISTER_NAMES \
1987 {"ah", "dh", "ch", "bh", }
1989 /* How to renumber registers for dbx and gdb. */
1991 #define DBX_REGISTER_NUMBER(N) \
1992 (TARGET_64BIT ? dbx64_register_map[(N)] : dbx_register_map[(N)])
1994 extern int const dbx_register_map[FIRST_PSEUDO_REGISTER];
1995 extern int const dbx64_register_map[FIRST_PSEUDO_REGISTER];
1996 extern int const svr4_dbx_register_map[FIRST_PSEUDO_REGISTER];
1998 /* Before the prologue, RA is at 0(%esp). */
1999 #define INCOMING_RETURN_ADDR_RTX \
2000 gen_rtx_MEM (VOIDmode, gen_rtx_REG (VOIDmode, STACK_POINTER_REGNUM))
2002 /* After the prologue, RA is at -4(AP) in the current frame. */
2003 #define RETURN_ADDR_RTX(COUNT, FRAME) \
2005 ? gen_rtx_MEM (Pmode, plus_constant (arg_pointer_rtx, -UNITS_PER_WORD)) \
2006 : gen_rtx_MEM (Pmode, plus_constant (FRAME, UNITS_PER_WORD)))
2008 /* PC is dbx register 8; let's use that column for RA. */
2009 #define DWARF_FRAME_RETURN_COLUMN (TARGET_64BIT ? 16 : 8)
2011 /* Before the prologue, the top of the frame is at 4(%esp). */
2012 #define INCOMING_FRAME_SP_OFFSET UNITS_PER_WORD
2014 /* Describe how we implement __builtin_eh_return. */
2015 #define EH_RETURN_DATA_REGNO(N) ((N) < 2 ? (N) : INVALID_REGNUM)
2016 #define EH_RETURN_STACKADJ_RTX gen_rtx_REG (Pmode, 2)
2019 /* Select a format to encode pointers in exception handling data. CODE
2020 is 0 for data, 1 for code labels, 2 for function pointers. GLOBAL is
2021 true if the symbol may be affected by dynamic relocations.
2023 ??? All x86 object file formats are capable of representing this.
2024 After all, the relocation needed is the same as for the call insn.
2025 Whether or not a particular assembler allows us to enter such, I
2026 guess we'll have to see. */
2027 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL) \
2028 asm_preferred_eh_data_format ((CODE), (GLOBAL))
2030 /* This is how to output an insn to push a register on the stack.
2031 It need not be very fast code. */
2033 #define ASM_OUTPUT_REG_PUSH(FILE, REGNO) \
2036 asm_fprintf ((FILE), "\tpush{q}\t%%r%s\n", \
2037 reg_names[(REGNO)] + (REX_INT_REGNO_P (REGNO) != 0)); \
2039 asm_fprintf ((FILE), "\tpush{l}\t%%e%s\n", reg_names[(REGNO)]); \
2042 /* This is how to output an insn to pop a register from the stack.
2043 It need not be very fast code. */
2045 #define ASM_OUTPUT_REG_POP(FILE, REGNO) \
2048 asm_fprintf ((FILE), "\tpop{q}\t%%r%s\n", \
2049 reg_names[(REGNO)] + (REX_INT_REGNO_P (REGNO) != 0)); \
2051 asm_fprintf ((FILE), "\tpop{l}\t%%e%s\n", reg_names[(REGNO)]); \
2054 /* This is how to output an element of a case-vector that is absolute. */
2056 #define ASM_OUTPUT_ADDR_VEC_ELT(FILE, VALUE) \
2057 ix86_output_addr_vec_elt ((FILE), (VALUE))
2059 /* This is how to output an element of a case-vector that is relative. */
2061 #define ASM_OUTPUT_ADDR_DIFF_ELT(FILE, BODY, VALUE, REL) \
2062 ix86_output_addr_diff_elt ((FILE), (VALUE), (REL))
2064 /* Under some conditions we need jump tables in the text section,
2065 because the assembler cannot handle label differences between
2066 sections. This is the case for x86_64 on Mach-O for example. */
2068 #define JUMP_TABLES_IN_TEXT_SECTION \
2069 (flag_pic && ((TARGET_MACHO && TARGET_64BIT) \
2070 || (!TARGET_64BIT && !HAVE_AS_GOTOFF_IN_DATA)))
2072 /* Switch to init or fini section via SECTION_OP, emit a call to FUNC,
2073 and switch back. For x86 we do this only to save a few bytes that
2074 would otherwise be unused in the text section. */
2075 #define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC) \
2076 asm (SECTION_OP "\n\t" \
2077 "call " USER_LABEL_PREFIX #FUNC "\n" \
2078 TEXT_SECTION_ASM_OP);
2080 /* Print operand X (an rtx) in assembler syntax to file FILE.
2081 CODE is a letter or dot (`z' in `%z0') or 0 if no letter was specified.
2082 Effect of various CODE letters is described in i386.c near
2083 print_operand function. */
2085 #define PRINT_OPERAND_PUNCT_VALID_P(CODE) \
2086 ((CODE) == '*' || (CODE) == '+' || (CODE) == '&')
2088 #define PRINT_OPERAND(FILE, X, CODE) \
2089 print_operand ((FILE), (X), (CODE))
2091 #define PRINT_OPERAND_ADDRESS(FILE, ADDR) \
2092 print_operand_address ((FILE), (ADDR))
2094 #define OUTPUT_ADDR_CONST_EXTRA(FILE, X, FAIL) \
2096 if (! output_addr_const_extra (FILE, (X))) \
2100 /* a letter which is not needed by the normal asm syntax, which
2101 we can use for operand syntax in the extended asm */
2103 #define ASM_OPERAND_LETTER '#'
2104 #define RET return ""
2105 #define AT_SP(MODE) (gen_rtx_MEM ((MODE), stack_pointer_rtx))
2107 /* Which processor to schedule for. The cpu attribute defines a list that
2108 mirrors this list, so changes to i386.md must be made at the same time. */
2112 PROCESSOR_I386, /* 80386 */
2113 PROCESSOR_I486, /* 80486DX, 80486SX, 80486DX[24] */
2115 PROCESSOR_PENTIUMPRO,
2123 PROCESSOR_GENERIC32,
2124 PROCESSOR_GENERIC64,
2129 extern enum processor_type ix86_tune;
2130 extern enum processor_type ix86_arch;
2138 extern enum fpmath_unit ix86_fpmath;
2147 extern enum tls_dialect ix86_tls_dialect;
2150 CM_32, /* The traditional 32-bit ABI. */
2151 CM_SMALL, /* Assumes all code and data fits in the low 31 bits. */
2152 CM_KERNEL, /* Assumes all code and data fits in the high 31 bits. */
2153 CM_MEDIUM, /* Assumes code fits in the low 31 bits; data unlimited. */
2154 CM_LARGE, /* No assumptions. */
2155 CM_SMALL_PIC, /* Assumes code+data+got/plt fits in a 31 bit region. */
2156 CM_MEDIUM_PIC /* Assumes code+got/plt fits in a 31 bit region. */
2159 extern enum cmodel ix86_cmodel;
2161 /* Size of the RED_ZONE area. */
2162 #define RED_ZONE_SIZE 128
2163 /* Reserved area of the red zone for temporaries. */
2164 #define RED_ZONE_RESERVE 8
2171 extern enum asm_dialect ix86_asm_dialect;
2172 extern unsigned int ix86_preferred_stack_boundary;
2173 extern int ix86_branch_cost, ix86_section_threshold;
2175 /* Smallest class containing REGNO. */
2176 extern enum reg_class const regclass_map[FIRST_PSEUDO_REGISTER];
2178 extern rtx ix86_compare_op0; /* operand 0 for comparisons */
2179 extern rtx ix86_compare_op1; /* operand 1 for comparisons */
2180 extern rtx ix86_compare_emitted;
2182 /* To properly truncate FP values into integers, we need to set i387 control
2183 word. We can't emit proper mode switching code before reload, as spills
2184 generated by reload may truncate values incorrectly, but we still can avoid
2185 redundant computation of new control word by the mode switching pass.
2186 The fldcw instructions are still emitted redundantly, but this is probably
2187 not going to be noticeable problem, as most CPUs do have fast path for
2190 The machinery is to emit simple truncation instructions and split them
2191 before reload to instructions having USEs of two memory locations that
2192 are filled by this code to old and new control word.
2194 Post-reload pass may be later used to eliminate the redundant fildcw if
2206 enum ix86_stack_slot
2215 MAX_386_STACK_LOCALS
2218 /* Define this macro if the port needs extra instructions inserted
2219 for mode switching in an optimizing compilation. */
2221 #define OPTIMIZE_MODE_SWITCHING(ENTITY) \
2222 ix86_optimize_mode_switching[(ENTITY)]
2224 /* If you define `OPTIMIZE_MODE_SWITCHING', you have to define this as
2225 initializer for an array of integers. Each initializer element N
2226 refers to an entity that needs mode switching, and specifies the
2227 number of different modes that might need to be set for this
2228 entity. The position of the initializer in the initializer -
2229 starting counting at zero - determines the integer that is used to
2230 refer to the mode-switched entity in question. */
2232 #define NUM_MODES_FOR_MODE_SWITCHING \
2233 { I387_CW_ANY, I387_CW_ANY, I387_CW_ANY, I387_CW_ANY }
2235 /* ENTITY is an integer specifying a mode-switched entity. If
2236 `OPTIMIZE_MODE_SWITCHING' is defined, you must define this macro to
2237 return an integer value not larger than the corresponding element
2238 in `NUM_MODES_FOR_MODE_SWITCHING', to denote the mode that ENTITY
2239 must be switched into prior to the execution of INSN. */
2241 #define MODE_NEEDED(ENTITY, I) ix86_mode_needed ((ENTITY), (I))
2243 /* This macro specifies the order in which modes for ENTITY are
2244 processed. 0 is the highest priority. */
2246 #define MODE_PRIORITY_TO_MODE(ENTITY, N) (N)
2248 /* Generate one or more insns to set ENTITY to MODE. HARD_REG_LIVE
2249 is the set of hard registers live at the point where the insn(s)
2250 are to be inserted. */
2252 #define EMIT_MODE_SET(ENTITY, MODE, HARD_REGS_LIVE) \
2253 ((MODE) != I387_CW_ANY && (MODE) != I387_CW_UNINITIALIZED \
2254 ? emit_i387_cw_initialization (MODE), 0 \
2258 /* Avoid renaming of stack registers, as doing so in combination with
2259 scheduling just increases amount of live registers at time and in
2260 the turn amount of fxch instructions needed.
2262 ??? Maybe Pentium chips benefits from renaming, someone can try.... */
2264 #define HARD_REGNO_RENAME_OK(SRC, TARGET) \
2265 ((SRC) < FIRST_STACK_REG || (SRC) > LAST_STACK_REG)
2268 #define DLL_IMPORT_EXPORT_PREFIX '#'
2270 #define FASTCALL_PREFIX '@'
2272 struct machine_function GTY(())
2274 struct stack_local_entry *stack_locals;
2275 const char *some_ld_name;
2276 rtx force_align_arg_pointer;
2277 int save_varrargs_registers;
2278 int accesses_prev_frame;
2279 int optimize_mode_switching[MAX_386_ENTITIES];
2280 /* Set by ix86_compute_frame_layout and used by prologue/epilogue expander to
2281 determine the style used. */
2282 int use_fast_prologue_epilogue;
2283 /* Number of saved registers USE_FAST_PROLOGUE_EPILOGUE has been computed
2285 int use_fast_prologue_epilogue_nregs;
2286 /* If true, the current function needs the default PIC register, not
2287 an alternate register (on x86) and must not use the red zone (on
2288 x86_64), even if it's a leaf function. We don't want the
2289 function to be regarded as non-leaf because TLS calls need not
2290 affect register allocation. This flag is set when a TLS call
2291 instruction is expanded within a function, and never reset, even
2292 if all such instructions are optimized away. Use the
2293 ix86_current_function_calls_tls_descriptor macro for a better
2295 int tls_descriptor_call_expanded_p;
2298 #define ix86_stack_locals (cfun->machine->stack_locals)
2299 #define ix86_save_varrargs_registers (cfun->machine->save_varrargs_registers)
2300 #define ix86_optimize_mode_switching (cfun->machine->optimize_mode_switching)
2301 #define ix86_tls_descriptor_calls_expanded_in_cfun \
2302 (cfun->machine->tls_descriptor_call_expanded_p)
2303 /* Since tls_descriptor_call_expanded is not cleared, even if all TLS
2304 calls are optimized away, we try to detect cases in which it was
2305 optimized away. Since such instructions (use (reg REG_SP)), we can
2306 verify whether there's any such instruction live by testing that
2308 #define ix86_current_function_calls_tls_descriptor \
2309 (ix86_tls_descriptor_calls_expanded_in_cfun && regs_ever_live[SP_REG])
2311 /* Control behavior of x86_file_start. */
2312 #define X86_FILE_START_VERSION_DIRECTIVE false
2313 #define X86_FILE_START_FLTUSED false
2315 /* Flag to mark data that is in the large address area. */
2316 #define SYMBOL_FLAG_FAR_ADDR (SYMBOL_FLAG_MACH_DEP << 0)
2317 #define SYMBOL_REF_FAR_ADDR_P(X) \
2318 ((SYMBOL_REF_FLAGS (X) & SYMBOL_FLAG_FAR_ADDR) != 0)
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