1 /* Definitions of target machine for GNU compiler for IA-32.
2 Copyright (C) 1988, 1992, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001, 2002 Free Software Foundation, Inc.
5 This file is part of GNU CC.
7 GNU CC 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 GNU CC 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 GNU CC; see the file COPYING. If not, write to
19 the Free Software Foundation, 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, 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 /* Stubs for half-pic support if not OSF/1 reference platform. */
40 #define HALF_PIC_P() 0
41 #define HALF_PIC_NUMBER_PTRS 0
42 #define HALF_PIC_NUMBER_REFS 0
43 #define HALF_PIC_ENCODE(DECL)
44 #define HALF_PIC_DECLARE(NAME)
45 #define HALF_PIC_INIT() error ("half-pic init called on systems that don't support it")
46 #define HALF_PIC_ADDRESS_P(X) 0
47 #define HALF_PIC_PTR(X) (X)
48 #define HALF_PIC_FINISH(STREAM)
51 /* Define the specific costs for a given cpu */
53 struct processor_costs {
54 const int add; /* cost of an add instruction */
55 const int lea; /* cost of a lea instruction */
56 const int shift_var; /* variable shift costs */
57 const int shift_const; /* constant shift costs */
58 const int mult_init; /* cost of starting a multiply */
59 const int mult_bit; /* cost of multiply per each bit set */
60 const int divide; /* cost of a divide/mod */
61 int movsx; /* The cost of movsx operation. */
62 int movzx; /* The cost of movzx operation. */
63 const int large_insn; /* insns larger than this cost more */
64 const int move_ratio; /* The threshold of number of scalar
65 memory-to-memory move insns. */
66 const int movzbl_load; /* cost of loading using movzbl */
67 const int int_load[3]; /* cost of loading integer registers
68 in QImode, HImode and SImode relative
69 to reg-reg move (2). */
70 const int int_store[3]; /* cost of storing integer register
71 in QImode, HImode and SImode */
72 const int fp_move; /* cost of reg,reg fld/fst */
73 const int fp_load[3]; /* cost of loading FP register
74 in SFmode, DFmode and XFmode */
75 const int fp_store[3]; /* cost of storing FP register
76 in SFmode, DFmode and XFmode */
77 const int mmx_move; /* cost of moving MMX register. */
78 const int mmx_load[2]; /* cost of loading MMX register
79 in SImode and DImode */
80 const int mmx_store[2]; /* cost of storing MMX register
81 in SImode and DImode */
82 const int sse_move; /* cost of moving SSE register. */
83 const int sse_load[3]; /* cost of loading SSE register
84 in SImode, DImode and TImode*/
85 const int sse_store[3]; /* cost of storing SSE register
86 in SImode, DImode and TImode*/
87 const int mmxsse_to_integer; /* cost of moving mmxsse register to
88 integer and vice versa. */
89 const int prefetch_block; /* bytes moved to cache for prefetch. */
90 const int simultaneous_prefetches; /* number of parallel prefetch
94 extern const struct processor_costs *ix86_cost;
96 /* Run-time compilation parameters selecting different hardware subsets. */
98 extern int target_flags;
100 /* Macros used in the machine description to test the flags. */
102 /* configure can arrange to make this 2, to force a 486. */
104 #ifndef TARGET_CPU_DEFAULT
105 #define TARGET_CPU_DEFAULT 0
108 /* Masks for the -m switches */
109 #define MASK_80387 0x00000001 /* Hardware floating point */
110 #define MASK_RTD 0x00000002 /* Use ret that pops args */
111 #define MASK_ALIGN_DOUBLE 0x00000004 /* align doubles to 2 word boundary */
112 #define MASK_SVR3_SHLIB 0x00000008 /* Uninit locals into bss */
113 #define MASK_IEEE_FP 0x00000010 /* IEEE fp comparisons */
114 #define MASK_FLOAT_RETURNS 0x00000020 /* Return float in st(0) */
115 #define MASK_NO_FANCY_MATH_387 0x00000040 /* Disable sin, cos, sqrt */
116 #define MASK_OMIT_LEAF_FRAME_POINTER 0x080 /* omit leaf frame pointers */
117 #define MASK_STACK_PROBE 0x00000100 /* Enable stack probing */
118 #define MASK_NO_ALIGN_STROPS 0x00000200 /* Enable aligning of string ops. */
119 #define MASK_INLINE_ALL_STROPS 0x00000400 /* Inline stringops in all cases */
120 #define MASK_NO_PUSH_ARGS 0x00000800 /* Use push instructions */
121 #define MASK_ACCUMULATE_OUTGOING_ARGS 0x00001000/* Accumulate outgoing args */
122 #define MASK_ACCUMULATE_OUTGOING_ARGS_SET 0x00002000
123 #define MASK_MMX 0x00004000 /* Support MMX regs/builtins */
124 #define MASK_MMX_SET 0x00008000
125 #define MASK_SSE 0x00010000 /* Support SSE regs/builtins */
126 #define MASK_SSE_SET 0x00020000
127 #define MASK_SSE2 0x00040000 /* Support SSE2 regs/builtins */
128 #define MASK_SSE2_SET 0x00080000
129 #define MASK_3DNOW 0x00100000 /* Support 3Dnow builtins */
130 #define MASK_3DNOW_SET 0x00200000
131 #define MASK_3DNOW_A 0x00400000 /* Support Athlon 3Dnow builtins */
132 #define MASK_3DNOW_A_SET 0x00800000
133 #define MASK_128BIT_LONG_DOUBLE 0x01000000 /* long double size is 128bit */
134 #define MASK_64BIT 0x02000000 /* Produce 64bit code */
135 /* ... overlap with subtarget options starts by 0x04000000. */
136 #define MASK_NO_RED_ZONE 0x04000000 /* Do not use red zone */
138 /* Use the floating point instructions */
139 #define TARGET_80387 (target_flags & MASK_80387)
141 /* Compile using ret insn that pops args.
142 This will not work unless you use prototypes at least
143 for all functions that can take varying numbers of args. */
144 #define TARGET_RTD (target_flags & MASK_RTD)
146 /* Align doubles to a two word boundary. This breaks compatibility with
147 the published ABI's for structures containing doubles, but produces
148 faster code on the pentium. */
149 #define TARGET_ALIGN_DOUBLE (target_flags & MASK_ALIGN_DOUBLE)
151 /* Use push instructions to save outgoing args. */
152 #define TARGET_PUSH_ARGS (!(target_flags & MASK_NO_PUSH_ARGS))
154 /* Accumulate stack adjustments to prologue/epilogue. */
155 #define TARGET_ACCUMULATE_OUTGOING_ARGS \
156 (target_flags & MASK_ACCUMULATE_OUTGOING_ARGS)
158 /* Put uninitialized locals into bss, not data.
159 Meaningful only on svr3. */
160 #define TARGET_SVR3_SHLIB (target_flags & MASK_SVR3_SHLIB)
162 /* Use IEEE floating point comparisons. These handle correctly the cases
163 where the result of a comparison is unordered. Normally SIGFPE is
164 generated in such cases, in which case this isn't needed. */
165 #define TARGET_IEEE_FP (target_flags & MASK_IEEE_FP)
167 /* Functions that return a floating point value may return that value
168 in the 387 FPU or in 386 integer registers. If set, this flag causes
169 the 387 to be used, which is compatible with most calling conventions. */
170 #define TARGET_FLOAT_RETURNS_IN_80387 (target_flags & MASK_FLOAT_RETURNS)
172 /* Long double is 128bit instead of 96bit, even when only 80bits are used.
173 This mode wastes cache, but avoid misaligned data accesses and simplifies
174 address calculations. */
175 #define TARGET_128BIT_LONG_DOUBLE (target_flags & MASK_128BIT_LONG_DOUBLE)
177 /* Disable generation of FP sin, cos and sqrt operations for 387.
178 This is because FreeBSD lacks these in the math-emulator-code */
179 #define TARGET_NO_FANCY_MATH_387 (target_flags & MASK_NO_FANCY_MATH_387)
181 /* Don't create frame pointers for leaf functions */
182 #define TARGET_OMIT_LEAF_FRAME_POINTER \
183 (target_flags & MASK_OMIT_LEAF_FRAME_POINTER)
185 /* Debug GO_IF_LEGITIMATE_ADDRESS */
186 #define TARGET_DEBUG_ADDR (ix86_debug_addr_string != 0)
188 /* Debug FUNCTION_ARG macros */
189 #define TARGET_DEBUG_ARG (ix86_debug_arg_string != 0)
191 /* 64bit Sledgehammer mode */
192 #ifdef TARGET_BI_ARCH
193 #define TARGET_64BIT (target_flags & MASK_64BIT)
195 #ifdef TARGET_64BIT_DEFAULT
196 #define TARGET_64BIT 1
198 #define TARGET_64BIT 0
202 #define TARGET_386 (ix86_cpu == PROCESSOR_I386)
203 #define TARGET_486 (ix86_cpu == PROCESSOR_I486)
204 #define TARGET_PENTIUM (ix86_cpu == PROCESSOR_PENTIUM)
205 #define TARGET_PENTIUMPRO (ix86_cpu == PROCESSOR_PENTIUMPRO)
206 #define TARGET_K6 (ix86_cpu == PROCESSOR_K6)
207 #define TARGET_ATHLON (ix86_cpu == PROCESSOR_ATHLON)
208 #define TARGET_PENTIUM4 (ix86_cpu == PROCESSOR_PENTIUM4)
210 #define CPUMASK (1 << ix86_cpu)
211 extern const int x86_use_leave, x86_push_memory, x86_zero_extend_with_and;
212 extern const int x86_use_bit_test, x86_cmove, x86_deep_branch;
213 extern const int x86_branch_hints, x86_unroll_strlen;
214 extern const int x86_double_with_add, x86_partial_reg_stall, x86_movx;
215 extern const int x86_use_loop, x86_use_fiop, x86_use_mov0;
216 extern const int x86_use_cltd, x86_read_modify_write;
217 extern const int x86_read_modify, x86_split_long_moves;
218 extern const int x86_promote_QImode, x86_single_stringop;
219 extern const int x86_himode_math, x86_qimode_math, x86_promote_qi_regs;
220 extern const int x86_promote_hi_regs, x86_integer_DFmode_moves;
221 extern const int x86_add_esp_4, x86_add_esp_8, x86_sub_esp_4, x86_sub_esp_8;
222 extern const int x86_partial_reg_dependency, x86_memory_mismatch_stall;
223 extern const int x86_accumulate_outgoing_args, x86_prologue_using_move;
224 extern const int x86_epilogue_using_move, x86_decompose_lea;
225 extern int x86_prefetch_sse;
227 #define TARGET_USE_LEAVE (x86_use_leave & CPUMASK)
228 #define TARGET_PUSH_MEMORY (x86_push_memory & CPUMASK)
229 #define TARGET_ZERO_EXTEND_WITH_AND (x86_zero_extend_with_and & CPUMASK)
230 #define TARGET_USE_BIT_TEST (x86_use_bit_test & CPUMASK)
231 #define TARGET_UNROLL_STRLEN (x86_unroll_strlen & CPUMASK)
232 /* For sane SSE instruction set generation we need fcomi instruction. It is
233 safe to enable all CMOVE instructions. */
234 #define TARGET_CMOVE ((x86_cmove & (1 << ix86_arch)) || TARGET_SSE)
235 #define TARGET_DEEP_BRANCH_PREDICTION (x86_deep_branch & CPUMASK)
236 #define TARGET_BRANCH_PREDICTION_HINTS (x86_branch_hints & CPUMASK)
237 #define TARGET_DOUBLE_WITH_ADD (x86_double_with_add & CPUMASK)
238 #define TARGET_USE_SAHF ((x86_use_sahf & CPUMASK) && !TARGET_64BIT)
239 #define TARGET_MOVX (x86_movx & CPUMASK)
240 #define TARGET_PARTIAL_REG_STALL (x86_partial_reg_stall & CPUMASK)
241 #define TARGET_USE_LOOP (x86_use_loop & CPUMASK)
242 #define TARGET_USE_FIOP (x86_use_fiop & CPUMASK)
243 #define TARGET_USE_MOV0 (x86_use_mov0 & CPUMASK)
244 #define TARGET_USE_CLTD (x86_use_cltd & CPUMASK)
245 #define TARGET_SPLIT_LONG_MOVES (x86_split_long_moves & CPUMASK)
246 #define TARGET_READ_MODIFY_WRITE (x86_read_modify_write & CPUMASK)
247 #define TARGET_READ_MODIFY (x86_read_modify & CPUMASK)
248 #define TARGET_PROMOTE_QImode (x86_promote_QImode & CPUMASK)
249 #define TARGET_SINGLE_STRINGOP (x86_single_stringop & CPUMASK)
250 #define TARGET_QIMODE_MATH (x86_qimode_math & CPUMASK)
251 #define TARGET_HIMODE_MATH (x86_himode_math & CPUMASK)
252 #define TARGET_PROMOTE_QI_REGS (x86_promote_qi_regs & CPUMASK)
253 #define TARGET_PROMOTE_HI_REGS (x86_promote_hi_regs & CPUMASK)
254 #define TARGET_ADD_ESP_4 (x86_add_esp_4 & CPUMASK)
255 #define TARGET_ADD_ESP_8 (x86_add_esp_8 & CPUMASK)
256 #define TARGET_SUB_ESP_4 (x86_sub_esp_4 & CPUMASK)
257 #define TARGET_SUB_ESP_8 (x86_sub_esp_8 & CPUMASK)
258 #define TARGET_INTEGER_DFMODE_MOVES (x86_integer_DFmode_moves & CPUMASK)
259 #define TARGET_PARTIAL_REG_DEPENDENCY (x86_partial_reg_dependency & CPUMASK)
260 #define TARGET_MEMORY_MISMATCH_STALL (x86_memory_mismatch_stall & CPUMASK)
261 #define TARGET_PROLOGUE_USING_MOVE (x86_prologue_using_move & CPUMASK)
262 #define TARGET_EPILOGUE_USING_MOVE (x86_epilogue_using_move & CPUMASK)
263 #define TARGET_DECOMPOSE_LEA (x86_decompose_lea & CPUMASK)
264 #define TARGET_PREFETCH_SSE (x86_prefetch_sse)
266 #define TARGET_STACK_PROBE (target_flags & MASK_STACK_PROBE)
268 #define TARGET_ALIGN_STRINGOPS (!(target_flags & MASK_NO_ALIGN_STROPS))
269 #define TARGET_INLINE_ALL_STRINGOPS (target_flags & MASK_INLINE_ALL_STROPS)
271 #define ASSEMBLER_DIALECT (ix86_asm_dialect)
273 #define TARGET_SSE ((target_flags & (MASK_SSE | MASK_SSE2)) != 0)
274 #define TARGET_SSE2 ((target_flags & MASK_SSE2) != 0)
275 #define TARGET_SSE_MATH ((ix86_fpmath & FPMATH_SSE) != 0)
276 #define TARGET_MIX_SSE_I387 ((ix86_fpmath & FPMATH_SSE) \
277 && (ix86_fpmath & FPMATH_387))
278 #define TARGET_MMX ((target_flags & MASK_MMX) != 0)
279 #define TARGET_3DNOW ((target_flags & MASK_3DNOW) != 0)
280 #define TARGET_3DNOW_A ((target_flags & MASK_3DNOW_A) != 0)
282 #define TARGET_RED_ZONE (!(target_flags & MASK_NO_RED_ZONE))
284 #define TARGET_SWITCHES \
285 { { "80387", MASK_80387, N_("Use hardware fp") }, \
286 { "no-80387", -MASK_80387, N_("Do not use hardware fp") }, \
287 { "hard-float", MASK_80387, N_("Use hardware fp") }, \
288 { "soft-float", -MASK_80387, N_("Do not use hardware fp") }, \
289 { "no-soft-float", MASK_80387, N_("Use hardware fp") }, \
290 { "386", 0, N_("") /*Deprecated.*/}, \
291 { "486", 0, N_("") /*Deprecated.*/}, \
292 { "pentium", 0, N_("") /*Deprecated.*/}, \
293 { "pentiumpro", 0, N_("") /*Deprecated.*/}, \
294 { "intel-syntax", 0, N_("") /*Deprecated.*/}, \
295 { "no-intel-syntax", 0, N_("") /*Deprecated.*/}, \
297 N_("Alternate calling convention") }, \
298 { "no-rtd", -MASK_RTD, \
299 N_("Use normal calling convention") }, \
300 { "align-double", MASK_ALIGN_DOUBLE, \
301 N_("Align some doubles on dword boundary") }, \
302 { "no-align-double", -MASK_ALIGN_DOUBLE, \
303 N_("Align doubles on word boundary") }, \
304 { "svr3-shlib", MASK_SVR3_SHLIB, \
305 N_("Uninitialized locals in .bss") }, \
306 { "no-svr3-shlib", -MASK_SVR3_SHLIB, \
307 N_("Uninitialized locals in .data") }, \
308 { "ieee-fp", MASK_IEEE_FP, \
309 N_("Use IEEE math for fp comparisons") }, \
310 { "no-ieee-fp", -MASK_IEEE_FP, \
311 N_("Do not use IEEE math for fp comparisons") }, \
312 { "fp-ret-in-387", MASK_FLOAT_RETURNS, \
313 N_("Return values of functions in FPU registers") }, \
314 { "no-fp-ret-in-387", -MASK_FLOAT_RETURNS , \
315 N_("Do not return values of functions in FPU registers")}, \
316 { "no-fancy-math-387", MASK_NO_FANCY_MATH_387, \
317 N_("Do not generate sin, cos, sqrt for FPU") }, \
318 { "fancy-math-387", -MASK_NO_FANCY_MATH_387, \
319 N_("Generate sin, cos, sqrt for FPU")}, \
320 { "omit-leaf-frame-pointer", MASK_OMIT_LEAF_FRAME_POINTER, \
321 N_("Omit the frame pointer in leaf functions") }, \
322 { "no-omit-leaf-frame-pointer",-MASK_OMIT_LEAF_FRAME_POINTER, "" }, \
323 { "stack-arg-probe", MASK_STACK_PROBE, \
324 N_("Enable stack probing") }, \
325 { "no-stack-arg-probe", -MASK_STACK_PROBE, "" }, \
326 { "windows", 0, 0 /* undocumented */ }, \
327 { "dll", 0, 0 /* undocumented */ }, \
328 { "align-stringops", -MASK_NO_ALIGN_STROPS, \
329 N_("Align destination of the string operations") }, \
330 { "no-align-stringops", MASK_NO_ALIGN_STROPS, \
331 N_("Do not align destination of the string operations") }, \
332 { "inline-all-stringops", MASK_INLINE_ALL_STROPS, \
333 N_("Inline all known string operations") }, \
334 { "no-inline-all-stringops", -MASK_INLINE_ALL_STROPS, \
335 N_("Do not inline all known string operations") }, \
336 { "push-args", -MASK_NO_PUSH_ARGS, \
337 N_("Use push instructions to save outgoing arguments") }, \
338 { "no-push-args", MASK_NO_PUSH_ARGS, \
339 N_("Do not use push instructions to save outgoing arguments") }, \
340 { "accumulate-outgoing-args", (MASK_ACCUMULATE_OUTGOING_ARGS \
341 | MASK_ACCUMULATE_OUTGOING_ARGS_SET), \
342 N_("Use push instructions to save outgoing arguments") }, \
343 { "no-accumulate-outgoing-args",MASK_ACCUMULATE_OUTGOING_ARGS_SET, \
344 N_("Do not use push instructions to save outgoing arguments") }, \
345 { "mmx", MASK_MMX | MASK_MMX_SET, \
346 N_("Support MMX built-in functions") }, \
347 { "no-mmx", -MASK_MMX, \
348 N_("Do not support MMX built-in functions") }, \
349 { "no-mmx", MASK_MMX_SET, N_("") }, \
350 { "3dnow", MASK_3DNOW | MASK_3DNOW_SET, \
351 N_("Support 3DNow! built-in functions") }, \
352 { "no-3dnow", -MASK_3DNOW, N_("") }, \
353 { "no-3dnow", MASK_3DNOW_SET, \
354 N_("Do not support 3DNow! built-in functions") }, \
355 { "sse", MASK_SSE | MASK_SSE_SET, \
356 N_("Support MMX and SSE built-in functions and code generation") }, \
357 { "no-sse", -MASK_SSE, N_("") }, \
358 { "no-sse", MASK_SSE_SET, \
359 N_("Do not support MMX and SSE built-in functions and code generation") },\
360 { "sse2", MASK_SSE2 | MASK_SSE2_SET, \
361 N_("Support MMX, SSE and SSE2 built-in functions and code generation") }, \
362 { "no-sse2", -MASK_SSE2, N_("") }, \
363 { "no-sse2", MASK_SSE2_SET, \
364 N_("Do not support MMX, SSE and SSE2 built-in functions and code generation") }, \
365 { "128bit-long-double", MASK_128BIT_LONG_DOUBLE, \
366 N_("sizeof(long double) is 16") }, \
367 { "96bit-long-double", -MASK_128BIT_LONG_DOUBLE, \
368 N_("sizeof(long double) is 12") }, \
369 { "64", MASK_64BIT, \
370 N_("Generate 64bit x86-64 code") }, \
371 { "32", -MASK_64BIT, \
372 N_("Generate 32bit i386 code") }, \
373 { "red-zone", -MASK_NO_RED_ZONE, \
374 N_("Use red-zone in the x86-64 code") }, \
375 { "no-red-zone", MASK_NO_RED_ZONE, \
376 N_("Do not use red-zone in the x86-64 code") }, \
378 { "", TARGET_DEFAULT, 0 }}
380 #ifdef TARGET_64BIT_DEFAULT
381 #define TARGET_DEFAULT (MASK_64BIT | TARGET_SUBTARGET_DEFAULT)
383 #define TARGET_DEFAULT TARGET_SUBTARGET_DEFAULT
386 /* Which processor to schedule for. The cpu attribute defines a list that
387 mirrors this list, so changes to i386.md must be made at the same time. */
391 PROCESSOR_I386, /* 80386 */
392 PROCESSOR_I486, /* 80486DX, 80486SX, 80486DX[24] */
394 PROCESSOR_PENTIUMPRO,
406 extern enum processor_type ix86_cpu;
407 extern enum fpmath_unit ix86_fpmath;
409 extern int ix86_arch;
411 /* This macro is similar to `TARGET_SWITCHES' but defines names of
412 command options that have values. Its definition is an
413 initializer with a subgrouping for each command option.
415 Each subgrouping contains a string constant, that defines the
416 fixed part of the option name, and the address of a variable. The
417 variable, type `char *', is set to the variable part of the given
418 option if the fixed part matches. The actual option name is made
419 by appending `-m' to the specified name. */
420 #define TARGET_OPTIONS \
421 { { "cpu=", &ix86_cpu_string, \
422 N_("Schedule code for given CPU")}, \
423 { "fpmath=", &ix86_fpmath_string, \
424 N_("Generate floating point mathematics using given instruction set")},\
425 { "arch=", &ix86_arch_string, \
426 N_("Generate code for given CPU")}, \
427 { "regparm=", &ix86_regparm_string, \
428 N_("Number of registers used to pass integer arguments") }, \
429 { "align-loops=", &ix86_align_loops_string, \
430 N_("Loop code aligned to this power of 2") }, \
431 { "align-jumps=", &ix86_align_jumps_string, \
432 N_("Jump targets are aligned to this power of 2") }, \
433 { "align-functions=", &ix86_align_funcs_string, \
434 N_("Function starts are aligned to this power of 2") }, \
435 { "preferred-stack-boundary=", \
436 &ix86_preferred_stack_boundary_string, \
437 N_("Attempt to keep stack aligned to this power of 2") }, \
438 { "branch-cost=", &ix86_branch_cost_string, \
439 N_("Branches are this expensive (1-5, arbitrary units)") }, \
440 { "cmodel=", &ix86_cmodel_string, \
441 N_("Use given x86-64 code model") }, \
442 { "debug-arg", &ix86_debug_arg_string, \
443 N_("" /* Undocumented. */) }, \
444 { "debug-addr", &ix86_debug_addr_string, \
445 N_("" /* Undocumented. */) }, \
446 { "asm=", &ix86_asm_string, \
447 N_("Use given assembler dialect") }, \
451 /* Sometimes certain combinations of command options do not make
452 sense on a particular target machine. You can define a macro
453 `OVERRIDE_OPTIONS' to take account of this. This macro, if
454 defined, is executed once just after all the command options have
457 Don't use this macro to turn on various extra optimizations for
458 `-O'. That is what `OPTIMIZATION_OPTIONS' is for. */
460 #define OVERRIDE_OPTIONS override_options ()
462 /* These are meant to be redefined in the host dependent files */
463 #define SUBTARGET_SWITCHES
464 #define SUBTARGET_OPTIONS
466 /* Define this to change the optimizations performed by default. */
467 #define OPTIMIZATION_OPTIONS(LEVEL, SIZE) \
468 optimization_options ((LEVEL), (SIZE))
470 /* Specs for the compiler proper */
473 #define CC1_CPU_SPEC "\
476 %n`-m386' is deprecated. Use `-march=i386' or `-mcpu=i386' instead.\n} \
478 %n`-m486' is deprecated. Use `-march=i486' or `-mcpu=i486' instead.\n} \
479 %{mpentium:-mcpu=pentium \
480 %n`-mpentium' is deprecated. Use `-march=pentium' or `-mcpu=pentium' instead.\n} \
481 %{mpentiumpro:-mcpu=pentiumpro \
482 %n`-mpentiumpro' is deprecated. Use `-march=pentiumpro' or `-mcpu=pentiumpro' instead.\n}} \
483 %{mintel-syntax:-masm=intel \
484 %n`-mintel-syntax' is deprecated. Use `-masm=intel' instead.\n} \
485 %{mno-intel-syntax:-masm=att \
486 %n`-mno-intel-syntax' is deprecated. Use `-masm=att' instead.\n}"
489 #define TARGET_CPU_DEFAULT_i386 0
490 #define TARGET_CPU_DEFAULT_i486 1
491 #define TARGET_CPU_DEFAULT_pentium 2
492 #define TARGET_CPU_DEFAULT_pentium_mmx 3
493 #define TARGET_CPU_DEFAULT_pentiumpro 4
494 #define TARGET_CPU_DEFAULT_pentium2 5
495 #define TARGET_CPU_DEFAULT_pentium3 6
496 #define TARGET_CPU_DEFAULT_pentium4 7
497 #define TARGET_CPU_DEFAULT_k6 8
498 #define TARGET_CPU_DEFAULT_k6_2 9
499 #define TARGET_CPU_DEFAULT_k6_3 10
500 #define TARGET_CPU_DEFAULT_athlon 11
501 #define TARGET_CPU_DEFAULT_athlon_sse 12
503 #define TARGET_CPU_DEFAULT_NAMES {"i386", "i486", "pentium", "pentium-mmx",\
504 "pentiumpro", "pentium2", "pentium3", \
505 "pentium4", "k6", "k6-2", "k6-3",\
506 "athlon", "athlon-4"}
507 #ifndef CPP_CPU_DEFAULT_SPEC
508 #if TARGET_CPU_DEFAULT == TARGET_CPU_DEFAULT_i486
509 #define CPP_CPU_DEFAULT_SPEC "-D__tune_i486__"
511 #if TARGET_CPU_DEFAULT == TARGET_CPU_DEFAULT_pentium
512 #define CPP_CPU_DEFAULT_SPEC "-D__tune_i586__ -D__tune_pentium__"
514 #if TARGET_CPU_DEFAULT == TARGET_CPU_DEFAULT_pentium_mmx
515 #define CPP_CPU_DEFAULT_SPEC "-D__tune_i586__ -D__tune_pentium__ -D__tune_pentium_mmx__"
517 #if TARGET_CPU_DEFAULT == TARGET_CPU_DEFAULT_pentiumpro
518 #define CPP_CPU_DEFAULT_SPEC "-D__tune_i686__ -D__tune_pentiumpro__"
520 #if TARGET_CPU_DEFAULT == TARGET_CPU_DEFAULT_pentium2
521 #define CPP_CPU_DEFAULT_SPEC "-D__tune_i686__ -D__tune_pentiumpro__\
524 #if TARGET_CPU_DEFAULT == TARGET_CPU_DEFAULT_pentium3
525 #define CPP_CPU_DEFAULT_SPEC "-D__tune_i686__ -D__tune_pentiumpro__\
526 -D__tune_pentium2__ -D__tune_pentium3__"
528 #if TARGET_CPU_DEFAULT == TARGET_CPU_DEFAULT_pentium4
529 #define CPP_CPU_DEFAULT_SPEC "-D__tune_pentium4__"
531 #if TARGET_CPU_DEFAULT == TARGET_CPU_DEFAULT_k6
532 #define CPP_CPU_DEFAULT_SPEC "-D__tune_k6__"
534 #if TARGET_CPU_DEFAULT == TARGET_CPU_DEFAULT_k6_2
535 #define CPP_CPU_DEFAULT_SPEC "-D__tune_k6__ -D__tune_k6_2__"
537 #if TARGET_CPU_DEFAULT == TARGET_CPU_DEFAULT_k6_3
538 #define CPP_CPU_DEFAULT_SPEC "-D__tune_k6__ -D__tune_k6_3__"
540 #if TARGET_CPU_DEFAULT == TARGET_CPU_DEFAULT_athlon
541 #define CPP_CPU_DEFAULT_SPEC "-D__tune_athlon__"
543 #if TARGET_CPU_DEFAULT == TARGET_CPU_DEFAULT_athlon_sse
544 #define CPP_CPU_DEFAULT_SPEC "-D__tune_athlon__ -D__tune_athlon_sse__"
546 #ifndef CPP_CPU_DEFAULT_SPEC
547 #define CPP_CPU_DEFAULT_SPEC "-D__tune_i386__"
549 #endif /* CPP_CPU_DEFAULT_SPEC */
551 #ifdef TARGET_BI_ARCH
552 #define NO_BUILTIN_SIZE_TYPE
553 #define NO_BUILTIN_PTRDIFF_TYPE
556 #ifdef NO_BUILTIN_SIZE_TYPE
557 #define CPP_CPU32_SIZE_TYPE_SPEC \
558 " -D__SIZE_TYPE__=unsigned\\ int -D__PTRDIFF_TYPE__=int"
559 #define CPP_CPU64_SIZE_TYPE_SPEC \
560 " -D__SIZE_TYPE__=unsigned\\ long\\ int -D__PTRDIFF_TYPE__=long\\ int"
562 #define CPP_CPU32_SIZE_TYPE_SPEC ""
563 #define CPP_CPU64_SIZE_TYPE_SPEC ""
566 #define CPP_CPU32_SPEC \
567 "-Acpu=i386 -Amachine=i386 %{!ansi:%{!std=c*:%{!std=i*:-Di386}}} -D__i386 \
568 -D__i386__ %(cpp_cpu32sizet)"
570 #define CPP_CPU64_SPEC \
571 "-Acpu=x86_64 -Amachine=x86_64 -D__x86_64 -D__x86_64__ %(cpp_cpu64sizet)"
573 #define CPP_CPUCOMMON_SPEC "\
574 %{march=i386:%{!mcpu*:-D__tune_i386__ }}\
575 %{march=i486:-D__i486 -D__i486__ %{!mcpu*:-D__tune_i486__ }}\
576 %{march=pentium|march=i586:-D__i586 -D__i586__ -D__pentium -D__pentium__ \
577 %{!mcpu*:-D__tune_i586__ -D__tune_pentium__ }}\
578 %{march=pentium-mmx:-D__i586 -D__i586__ -D__pentium -D__pentium__ \
580 %{!mcpu*:-D__tune_i586__ -D__tune_pentium__ -D__tune_pentium_mmx__}}\
581 %{march=pentiumpro|march=i686:-D__i686 -D__i686__ \
582 -D__pentiumpro -D__pentiumpro__ \
583 %{!mcpu*:-D__tune_i686__ -D__tune_pentiumpro__ }}\
584 %{march=k6:-D__k6 -D__k6__ %{!mcpu*:-D__tune_k6__ }}\
585 %{march=k6-2:-D__k6 -D__k6__ -D__k6_2__ \
586 %{!mcpu*:-D__tune_k6__ -D__tune_k6_2__ }}\
587 %{march=k6-3:-D__k6 -D__k6__ -D__k6_3__ \
588 %{!mcpu*:-D__tune_k6__ -D__tune_k6_3__ }}\
589 %{march=athlon|march=athlon-tbird:-D__athlon -D__athlon__ \
590 %{!mcpu*:-D__tune_athlon__ }}\
591 %{march=athlon-4|march=athlon-xp|march=athlon-mp:-D__athlon -D__athlon__ \
593 %{!mcpu*:-D__tune_athlon__ -D__tune_athlon_sse__ }}\
594 %{march=pentium4:-D__pentium4 -D__pentium4__ %{!mcpu*:-D__tune_pentium4__ }}\
595 %{m386|mcpu=i386:-D__tune_i386__ }\
596 %{m486|mcpu=i486:-D__tune_i486__ }\
597 %{mpentium|mcpu=pentium|mcpu=i586|mcpu=pentium-mmx:-D__tune_i586__ -D__tune_pentium__ }\
598 %{mpentiumpro|mcpu=pentiumpro|mcpu=i686|cpu=pentium2|cpu=pentium3:-D__tune_i686__ \
599 -D__tune_pentiumpro__ }\
600 %{mcpu=k6|mcpu=k6-2|mcpu=k6-3:-D__tune_k6__ }\
601 %{mcpu=athlon|mcpu=athlon-tbird|mcpu=athlon-4|mcpu=athlon-xp|mcpu=athlon-mp:\
603 %{mcpu=athlon-4|mcpu=athlon-xp|mcpu=athlon-mp:\
604 -D__tune_athlon_sse__ }\
605 %{mcpu=pentium4:-D__tune_pentium4__ }\
606 %{march=athlon-tbird|march=athlon-xp|march=athlon-mp|march=pentium3|march=pentium4:\
608 %{march=pentium-mmx|march=k6|march=k6-2|march=k6-3\
609 march=athlon|march=athlon-tbird|march=athlon-4|march=athlon-xp\
610 |march=athlon-mp|march=pentium2|march=pentium3|march=pentium4: -D__MMX__ }\
611 %{march=k6-2|march=k6-3\
612 march=athlon|march=athlon-tbird|march=athlon-4|march=athlon-xp\
613 |march=athlon-mp: -D__3dNOW__ }\
614 %{march=athlon|march=athlon-tbird|march=athlon-4|march=athlon-xp\
615 |march=athlon-mp: -D__3dNOW_A__ }\
616 %{march=pentium4: -D__SSE2__ }\
617 %{!march*:%{!mcpu*:%{!m386:%{!m486:%{!mpentium*:%(cpp_cpu_default)}}}}}"
620 #ifdef TARGET_BI_ARCH
621 #ifdef TARGET_64BIT_DEFAULT
622 #define CPP_CPU_SPEC "%{m32:%(cpp_cpu32)}%{!m32:%(cpp_cpu64)} %(cpp_cpucommon)"
624 #define CPP_CPU_SPEC "%{m64:%(cpp_cpu64)}%{!m64:%(cpp_cpu32)} %(cpp_cpucommon)"
627 #ifdef TARGET_64BIT_DEFAULT
628 #define CPP_CPU_SPEC "%(cpp_cpu64) %(cpp_cpucommon)"
630 #define CPP_CPU_SPEC "%(cpp_cpu32) %(cpp_cpucommon)"
636 #define CC1_SPEC "%(cc1_cpu) "
639 /* This macro defines names of additional specifications to put in the
640 specs that can be used in various specifications like CC1_SPEC. Its
641 definition is an initializer with a subgrouping for each command option.
643 Each subgrouping contains a string constant, that defines the
644 specification name, and a string constant that used by the GNU CC driver
647 Do not define this macro if it does not need to do anything. */
649 #ifndef SUBTARGET_EXTRA_SPECS
650 #define SUBTARGET_EXTRA_SPECS
653 #define EXTRA_SPECS \
654 { "cpp_cpu_default", CPP_CPU_DEFAULT_SPEC }, \
655 { "cpp_cpu", CPP_CPU_SPEC }, \
656 { "cpp_cpu32", CPP_CPU32_SPEC }, \
657 { "cpp_cpu64", CPP_CPU64_SPEC }, \
658 { "cpp_cpu32sizet", CPP_CPU32_SIZE_TYPE_SPEC }, \
659 { "cpp_cpu64sizet", CPP_CPU64_SIZE_TYPE_SPEC }, \
660 { "cpp_cpucommon", CPP_CPUCOMMON_SPEC }, \
661 { "cc1_cpu", CC1_CPU_SPEC }, \
662 SUBTARGET_EXTRA_SPECS
664 /* target machine storage layout */
666 /* Define for XFmode or TFmode extended real floating point support.
667 This will automatically cause REAL_ARITHMETIC to be defined.
669 The XFmode is specified by i386 ABI, while TFmode may be faster
670 due to alignment and simplifications in the address calculations.
672 #define LONG_DOUBLE_TYPE_SIZE (TARGET_128BIT_LONG_DOUBLE ? 128 : 96)
673 #define MAX_LONG_DOUBLE_TYPE_SIZE 128
675 #define LIBGCC2_LONG_DOUBLE_TYPE_SIZE 128
677 #define LIBGCC2_LONG_DOUBLE_TYPE_SIZE 96
679 /* Tell real.c that this is the 80-bit Intel extended float format
680 packaged in a 128-bit or 96bit entity. */
681 #define INTEL_EXTENDED_IEEE_FORMAT 1
684 #define SHORT_TYPE_SIZE 16
685 #define INT_TYPE_SIZE 32
686 #define FLOAT_TYPE_SIZE 32
687 #define LONG_TYPE_SIZE BITS_PER_WORD
688 #define MAX_WCHAR_TYPE_SIZE 32
689 #define DOUBLE_TYPE_SIZE 64
690 #define LONG_LONG_TYPE_SIZE 64
692 #if defined (TARGET_BI_ARCH) || defined (TARGET_64BIT_DEFAULT)
693 #define MAX_BITS_PER_WORD 64
694 #define MAX_LONG_TYPE_SIZE 64
696 #define MAX_BITS_PER_WORD 32
697 #define MAX_LONG_TYPE_SIZE 32
700 /* Define if you don't want extended real, but do want to use the
701 software floating point emulator for REAL_ARITHMETIC and
702 decimal <-> binary conversion. */
703 /* #define REAL_ARITHMETIC */
705 /* Define this if most significant byte of a word is the lowest numbered. */
706 /* That is true on the 80386. */
708 #define BITS_BIG_ENDIAN 0
710 /* Define this if most significant byte of a word is the lowest numbered. */
711 /* That is not true on the 80386. */
712 #define BYTES_BIG_ENDIAN 0
714 /* Define this if most significant word of a multiword number is the lowest
716 /* Not true for 80386 */
717 #define WORDS_BIG_ENDIAN 0
719 /* number of bits in an addressable storage unit */
720 #define BITS_PER_UNIT 8
722 /* Width in bits of a "word", which is the contents of a machine register.
723 Note that this is not necessarily the width of data type `int';
724 if using 16-bit ints on a 80386, this would still be 32.
725 But on a machine with 16-bit registers, this would be 16. */
726 #define BITS_PER_WORD (TARGET_64BIT ? 64 : 32)
728 /* Width of a word, in units (bytes). */
729 #define UNITS_PER_WORD (TARGET_64BIT ? 8 : 4)
730 #define MIN_UNITS_PER_WORD 4
732 /* Width in bits of a pointer.
733 See also the macro `Pmode' defined below. */
734 #define POINTER_SIZE BITS_PER_WORD
736 /* Allocation boundary (in *bits*) for storing arguments in argument list. */
737 #define PARM_BOUNDARY BITS_PER_WORD
739 /* Boundary (in *bits*) on which stack pointer should be aligned. */
740 #define STACK_BOUNDARY BITS_PER_WORD
742 /* Boundary (in *bits*) on which the stack pointer preferrs to be
743 aligned; the compiler cannot rely on having this alignment. */
744 #define PREFERRED_STACK_BOUNDARY ix86_preferred_stack_boundary
746 /* As of July 2001, many runtimes to not align the stack properly when
747 entering main. This causes expand_main_function to forcably align
748 the stack, which results in aligned frames for functions called from
749 main, though it does nothing for the alignment of main itself. */
750 #define FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN \
751 (ix86_preferred_stack_boundary > STACK_BOUNDARY && !TARGET_64BIT)
753 /* Allocation boundary for the code of a function. */
754 #define FUNCTION_BOUNDARY 16
756 /* Alignment of field after `int : 0' in a structure. */
758 #define EMPTY_FIELD_BOUNDARY BITS_PER_WORD
760 /* Minimum size in bits of the largest boundary to which any
761 and all fundamental data types supported by the hardware
762 might need to be aligned. No data type wants to be aligned
765 Pentium+ preferrs DFmode values to be aligned to 64 bit boundary
766 and Pentium Pro XFmode values at 128 bit boundaries. */
768 #define BIGGEST_ALIGNMENT 128
770 /* Decide whether a variable of mode MODE must be 128 bit aligned. */
771 #define ALIGN_MODE_128(MODE) \
772 ((MODE) == XFmode || (MODE) == TFmode || ((MODE) == TImode) \
773 || (MODE) == V4SFmode || (MODE) == V4SImode)
775 /* The published ABIs say that doubles should be aligned on word
776 boundaries, so lower the aligment for structure fields unless
777 -malign-double is set. */
778 /* BIGGEST_FIELD_ALIGNMENT is also used in libobjc, where it must be
779 constant. Use the smaller value in that context. */
780 #ifndef IN_TARGET_LIBS
781 #define BIGGEST_FIELD_ALIGNMENT (TARGET_64BIT ? 128 : (TARGET_ALIGN_DOUBLE ? 64 : 32))
783 #define BIGGEST_FIELD_ALIGNMENT 32
786 /* If defined, a C expression to compute the alignment given to a
787 constant that is being placed in memory. EXP is the constant
788 and ALIGN is the alignment that the object would ordinarily have.
789 The value of this macro is used instead of that alignment to align
792 If this macro is not defined, then ALIGN is used.
794 The typical use of this macro is to increase alignment for string
795 constants to be word aligned so that `strcpy' calls that copy
796 constants can be done inline. */
798 #define CONSTANT_ALIGNMENT(EXP, ALIGN) ix86_constant_alignment ((EXP), (ALIGN))
800 /* If defined, a C expression to compute the alignment for a static
801 variable. TYPE is the data type, and ALIGN is the alignment that
802 the object would ordinarily have. The value of this macro is used
803 instead of that alignment to align the object.
805 If this macro is not defined, then ALIGN is used.
807 One use of this macro is to increase alignment of medium-size
808 data to make it all fit in fewer cache lines. Another is to
809 cause character arrays to be word-aligned so that `strcpy' calls
810 that copy constants to character arrays can be done inline. */
812 #define DATA_ALIGNMENT(TYPE, ALIGN) ix86_data_alignment ((TYPE), (ALIGN))
814 /* If defined, a C expression to compute the alignment for a local
815 variable. TYPE is the data type, and ALIGN is the alignment that
816 the object would ordinarily have. The value of this macro is used
817 instead of that alignment to align the object.
819 If this macro is not defined, then ALIGN is used.
821 One use of this macro is to increase alignment of medium-size
822 data to make it all fit in fewer cache lines. */
824 #define LOCAL_ALIGNMENT(TYPE, ALIGN) ix86_local_alignment ((TYPE), (ALIGN))
826 /* If defined, a C expression that gives the alignment boundary, in
827 bits, of an argument with the specified mode and type. If it is
828 not defined, `PARM_BOUNDARY' is used for all arguments. */
830 #define FUNCTION_ARG_BOUNDARY(MODE, TYPE) \
831 ix86_function_arg_boundary ((MODE), (TYPE))
833 /* Set this non-zero if move instructions will actually fail to work
834 when given unaligned data. */
835 #define STRICT_ALIGNMENT 0
837 /* If bit field type is int, don't let it cross an int,
838 and give entire struct the alignment of an int. */
839 /* Required on the 386 since it doesn't have bitfield insns. */
840 #define PCC_BITFIELD_TYPE_MATTERS 1
842 /* Standard register usage. */
844 /* This processor has special stack-like registers. See reg-stack.c
848 #define IS_STACK_MODE(MODE) \
849 ((MODE) == DFmode || (MODE) == SFmode || (MODE) == XFmode \
852 /* Number of actual hardware registers.
853 The hardware registers are assigned numbers for the compiler
854 from 0 to just below FIRST_PSEUDO_REGISTER.
855 All registers that the compiler knows about must be given numbers,
856 even those that are not normally considered general registers.
858 In the 80386 we give the 8 general purpose registers the numbers 0-7.
859 We number the floating point registers 8-15.
860 Note that registers 0-7 can be accessed as a short or int,
861 while only 0-3 may be used with byte `mov' instructions.
863 Reg 16 does not correspond to any hardware register, but instead
864 appears in the RTL as an argument pointer prior to reload, and is
865 eliminated during reloading in favor of either the stack or frame
868 #define FIRST_PSEUDO_REGISTER 53
870 /* Number of hardware registers that go into the DWARF-2 unwind info.
871 If not defined, equals FIRST_PSEUDO_REGISTER. */
873 #define DWARF_FRAME_REGISTERS 17
875 /* 1 for registers that have pervasive standard uses
876 and are not available for the register allocator.
877 On the 80386, the stack pointer is such, as is the arg pointer.
879 The value is an mask - bit 1 is set for fixed registers
880 for 32bit target, while 2 is set for fixed registers for 64bit.
881 Proper value is computed in the CONDITIONAL_REGISTER_USAGE.
883 #define FIXED_REGISTERS \
884 /*ax,dx,cx,bx,si,di,bp,sp,st,st1,st2,st3,st4,st5,st6,st7*/ \
885 { 0, 0, 0, 0, 0, 0, 0, 3, 0, 0, 0, 0, 0, 0, 0, 0, \
886 /*arg,flags,fpsr,dir,frame*/ \
888 /*xmm0,xmm1,xmm2,xmm3,xmm4,xmm5,xmm6,xmm7*/ \
889 0, 0, 0, 0, 0, 0, 0, 0, \
890 /*mmx0,mmx1,mmx2,mmx3,mmx4,mmx5,mmx6,mmx7*/ \
891 0, 0, 0, 0, 0, 0, 0, 0, \
892 /* r8, r9, r10, r11, r12, r13, r14, r15*/ \
893 1, 1, 1, 1, 1, 1, 1, 1, \
894 /*xmm8,xmm9,xmm10,xmm11,xmm12,xmm13,xmm14,xmm15*/ \
895 1, 1, 1, 1, 1, 1, 1, 1}
898 /* 1 for registers not available across function calls.
899 These must include the FIXED_REGISTERS and also any
900 registers that can be used without being saved.
901 The latter must include the registers where values are returned
902 and the register where structure-value addresses are passed.
903 Aside from that, you can include as many other registers as you like.
905 The value is an mask - bit 1 is set for call used
906 for 32bit target, while 2 is set for call used for 64bit.
907 Proper value is computed in the CONDITIONAL_REGISTER_USAGE.
909 #define CALL_USED_REGISTERS \
910 /*ax,dx,cx,bx,si,di,bp,sp,st,st1,st2,st3,st4,st5,st6,st7*/ \
911 { 3, 3, 3, 0, 2, 2, 0, 3, 3, 3, 3, 3, 3, 3, 3, 3, \
912 /*arg,flags,fpsr,dir,frame*/ \
914 /*xmm0,xmm1,xmm2,xmm3,xmm4,xmm5,xmm6,xmm7*/ \
915 3, 3, 3, 3, 3, 3, 3, 3, \
916 /*mmx0,mmx1,mmx2,mmx3,mmx4,mmx5,mmx6,mmx7*/ \
917 3, 3, 3, 3, 3, 3, 3, 3, \
918 /* r8, r9, r10, r11, r12, r13, r14, r15*/ \
919 3, 3, 3, 3, 1, 1, 1, 1, \
920 /*xmm8,xmm9,xmm10,xmm11,xmm12,xmm13,xmm14,xmm15*/ \
921 3, 3, 3, 3, 3, 3, 3, 3} \
923 /* Order in which to allocate registers. Each register must be
924 listed once, even those in FIXED_REGISTERS. List frame pointer
925 late and fixed registers last. Note that, in general, we prefer
926 registers listed in CALL_USED_REGISTERS, keeping the others
927 available for storage of persistent values.
929 Three different versions of REG_ALLOC_ORDER have been tried:
931 If the order is edx, ecx, eax, ... it produces a slightly faster compiler,
932 but slower code on simple functions returning values in eax.
934 If the order is eax, ecx, edx, ... it causes reload to abort when compiling
935 perl 4.036 due to not being able to create a DImode register (to hold a 2
938 If the order is eax, edx, ecx, ... it produces better code for simple
939 functions, and a slightly slower compiler. Users complained about the code
940 generated by allocating edx first, so restore the 'natural' order of things. */
942 #define REG_ALLOC_ORDER \
945 /* bx,si,di,bp,sp,*/ \
949 /*r12,r15,r14,r13*/ \
951 /*xmm0,xmm1,xmm2,xmm3,xmm4,xmm5,xmm6,xmm7*/ \
952 21, 22, 23, 24, 25, 26, 27, 28, \
953 /*xmm8,xmm9,xmm10,xmm11,xmm12,xmm13,xmm14,xmm15*/ \
954 45, 46, 47, 48, 49, 50, 51, 52, \
955 /*st,st1,st2,st3,st4,st5,st6,st7*/ \
956 8, 9, 10, 11, 12, 13, 14, 15, \
957 /*,arg,cc,fpsr,dir,frame*/ \
959 /*mmx0,mmx1,mmx2,mmx3,mmx4,mmx5,mmx6,mmx7*/ \
960 29, 30, 31, 32, 33, 34, 35, 36 }
962 /* Macro to conditionally modify fixed_regs/call_used_regs. */
963 #define CONDITIONAL_REGISTER_USAGE \
966 for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) \
968 fixed_regs[i] = (fixed_regs[i] & (TARGET_64BIT ? 2 : 1)) != 0; \
969 call_used_regs[i] = (call_used_regs[i] \
970 & (TARGET_64BIT ? 2 : 1)) != 0; \
974 fixed_regs[PIC_OFFSET_TABLE_REGNUM] = 1; \
975 call_used_regs[PIC_OFFSET_TABLE_REGNUM] = 1; \
980 for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) \
981 if (TEST_HARD_REG_BIT (reg_class_contents[(int)MMX_REGS], i)) \
982 fixed_regs[i] = call_used_regs[i] = 1; \
987 for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) \
988 if (TEST_HARD_REG_BIT (reg_class_contents[(int)SSE_REGS], i)) \
989 fixed_regs[i] = call_used_regs[i] = 1; \
991 if (! TARGET_80387 && ! TARGET_FLOAT_RETURNS_IN_80387) \
995 COPY_HARD_REG_SET (x, reg_class_contents[(int)FLOAT_REGS]); \
996 for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) \
997 if (TEST_HARD_REG_BIT (x, i)) \
998 fixed_regs[i] = call_used_regs[i] = 1; \
1002 /* Return number of consecutive hard regs needed starting at reg REGNO
1003 to hold something of mode MODE.
1004 This is ordinarily the length in words of a value of mode MODE
1005 but can be less for certain modes in special long registers.
1007 Actually there are no two word move instructions for consecutive
1008 registers. And only registers 0-3 may have mov byte instructions
1012 #define HARD_REGNO_NREGS(REGNO, MODE) \
1013 (FP_REGNO_P (REGNO) || SSE_REGNO_P (REGNO) || MMX_REGNO_P (REGNO) \
1014 ? (COMPLEX_MODE_P (MODE) ? 2 : 1) \
1015 : ((MODE) == TFmode \
1016 ? (TARGET_64BIT ? 2 : 3) \
1017 : (MODE) == TCmode \
1018 ? (TARGET_64BIT ? 4 : 6) \
1019 : ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD)))
1021 #define VALID_SSE_REG_MODE(MODE) \
1022 ((MODE) == TImode || (MODE) == V4SFmode || (MODE) == V4SImode \
1023 || (MODE) == SFmode \
1024 || (TARGET_SSE2 && ((MODE) == DFmode || VALID_MMX_REG_MODE (MODE))))
1026 #define VALID_MMX_REG_MODE_3DNOW(MODE) \
1027 ((MODE) == V2SFmode || (MODE) == SFmode)
1029 #define VALID_MMX_REG_MODE(MODE) \
1030 ((MODE) == DImode || (MODE) == V8QImode || (MODE) == V4HImode \
1031 || (MODE) == V2SImode || (MODE) == SImode)
1033 #define VECTOR_MODE_SUPPORTED_P(MODE) \
1034 (VALID_SSE_REG_MODE (MODE) && TARGET_SSE ? 1 \
1035 : VALID_MMX_REG_MODE (MODE) && TARGET_MMX ? 1 \
1036 : VALID_MMX_REG_MODE_3DNOW (MODE) && TARGET_3DNOW ? 1 : 0)
1038 #define VALID_FP_MODE_P(MODE) \
1039 ((MODE) == SFmode || (MODE) == DFmode || (MODE) == TFmode \
1040 || (!TARGET_64BIT && (MODE) == XFmode) \
1041 || (MODE) == SCmode || (MODE) == DCmode || (MODE) == TCmode \
1042 || (!TARGET_64BIT && (MODE) == XCmode))
1044 #define VALID_INT_MODE_P(MODE) \
1045 ((MODE) == QImode || (MODE) == HImode || (MODE) == SImode \
1046 || (MODE) == DImode \
1047 || (MODE) == CQImode || (MODE) == CHImode || (MODE) == CSImode \
1048 || (MODE) == CDImode \
1049 || (TARGET_64BIT && ((MODE) == TImode || (MODE) == CTImode)))
1051 /* Value is 1 if hard register REGNO can hold a value of machine-mode MODE. */
1053 #define HARD_REGNO_MODE_OK(REGNO, MODE) \
1054 ix86_hard_regno_mode_ok ((REGNO), (MODE))
1056 /* Value is 1 if it is a good idea to tie two pseudo registers
1057 when one has mode MODE1 and one has mode MODE2.
1058 If HARD_REGNO_MODE_OK could produce different values for MODE1 and MODE2,
1059 for any hard reg, then this must be 0 for correct output. */
1061 #define MODES_TIEABLE_P(MODE1, MODE2) \
1062 ((MODE1) == (MODE2) \
1063 || (((MODE1) == HImode || (MODE1) == SImode \
1064 || ((MODE1) == QImode \
1065 && (TARGET_64BIT || !TARGET_PARTIAL_REG_STALL)) \
1066 || ((MODE1) == DImode && TARGET_64BIT)) \
1067 && ((MODE2) == HImode || (MODE2) == SImode \
1068 || ((MODE1) == QImode \
1069 && (TARGET_64BIT || !TARGET_PARTIAL_REG_STALL)) \
1070 || ((MODE2) == DImode && TARGET_64BIT))))
1073 /* Specify the modes required to caller save a given hard regno.
1074 We do this on i386 to prevent flags from being saved at all.
1076 Kill any attempts to combine saving of modes. */
1078 #define HARD_REGNO_CALLER_SAVE_MODE(REGNO, NREGS, MODE) \
1079 (CC_REGNO_P (REGNO) ? VOIDmode \
1080 : (MODE) == VOIDmode && (NREGS) != 1 ? VOIDmode \
1081 : (MODE) == VOIDmode ? choose_hard_reg_mode ((REGNO), (NREGS)) \
1082 : (MODE) == HImode && !TARGET_PARTIAL_REG_STALL ? SImode \
1083 : (MODE) == QImode && (REGNO) >= 4 && !TARGET_64BIT ? SImode \
1085 /* Specify the registers used for certain standard purposes.
1086 The values of these macros are register numbers. */
1088 /* on the 386 the pc register is %eip, and is not usable as a general
1089 register. The ordinary mov instructions won't work */
1090 /* #define PC_REGNUM */
1092 /* Register to use for pushing function arguments. */
1093 #define STACK_POINTER_REGNUM 7
1095 /* Base register for access to local variables of the function. */
1096 #define HARD_FRAME_POINTER_REGNUM 6
1098 /* Base register for access to local variables of the function. */
1099 #define FRAME_POINTER_REGNUM 20
1101 /* First floating point reg */
1102 #define FIRST_FLOAT_REG 8
1104 /* First & last stack-like regs */
1105 #define FIRST_STACK_REG FIRST_FLOAT_REG
1106 #define LAST_STACK_REG (FIRST_FLOAT_REG + 7)
1108 #define FLAGS_REG 17
1110 #define DIRFLAG_REG 19
1112 #define FIRST_SSE_REG (FRAME_POINTER_REGNUM + 1)
1113 #define LAST_SSE_REG (FIRST_SSE_REG + 7)
1115 #define FIRST_MMX_REG (LAST_SSE_REG + 1)
1116 #define LAST_MMX_REG (FIRST_MMX_REG + 7)
1118 #define FIRST_REX_INT_REG (LAST_MMX_REG + 1)
1119 #define LAST_REX_INT_REG (FIRST_REX_INT_REG + 7)
1121 #define FIRST_REX_SSE_REG (LAST_REX_INT_REG + 1)
1122 #define LAST_REX_SSE_REG (FIRST_REX_SSE_REG + 7)
1124 /* Value should be nonzero if functions must have frame pointers.
1125 Zero means the frame pointer need not be set up (and parms
1126 may be accessed via the stack pointer) in functions that seem suitable.
1127 This is computed in `reload', in reload1.c. */
1128 #define FRAME_POINTER_REQUIRED ix86_frame_pointer_required ()
1130 /* Override this in other tm.h files to cope with various OS losage
1131 requiring a frame pointer. */
1132 #ifndef SUBTARGET_FRAME_POINTER_REQUIRED
1133 #define SUBTARGET_FRAME_POINTER_REQUIRED 0
1136 /* Make sure we can access arbitrary call frames. */
1137 #define SETUP_FRAME_ADDRESSES() ix86_setup_frame_addresses ()
1139 /* Base register for access to arguments of the function. */
1140 #define ARG_POINTER_REGNUM 16
1142 /* Register in which static-chain is passed to a function.
1143 We do use ECX as static chain register for 32 bit ABI. On the
1144 64bit ABI, ECX is an argument register, so we use R10 instead. */
1145 #define STATIC_CHAIN_REGNUM (TARGET_64BIT ? FIRST_REX_INT_REG + 10 - 8 : 2)
1147 /* Register to hold the addressing base for position independent
1148 code access to data items.
1149 We don't use PIC pointer for 64bit mode. Define the regnum to
1150 dummy value to prevent gcc from pessimizing code dealing with EBX.
1152 #define PIC_OFFSET_TABLE_REGNUM (TARGET_64BIT ? INVALID_REGNUM : 3)
1154 /* Register in which address to store a structure value
1155 arrives in the function. On the 386, the prologue
1156 copies this from the stack to register %eax. */
1157 #define STRUCT_VALUE_INCOMING 0
1159 /* Place in which caller passes the structure value address.
1160 0 means push the value on the stack like an argument. */
1161 #define STRUCT_VALUE 0
1163 /* A C expression which can inhibit the returning of certain function
1164 values in registers, based on the type of value. A nonzero value
1165 says to return the function value in memory, just as large
1166 structures are always returned. Here TYPE will be a C expression
1167 of type `tree', representing the data type of the value.
1169 Note that values of mode `BLKmode' must be explicitly handled by
1170 this macro. Also, the option `-fpcc-struct-return' takes effect
1171 regardless of this macro. On most systems, it is possible to
1172 leave the macro undefined; this causes a default definition to be
1173 used, whose value is the constant 1 for `BLKmode' values, and 0
1176 Do not use this macro to indicate that structures and unions
1177 should always be returned in memory. You should instead use
1178 `DEFAULT_PCC_STRUCT_RETURN' to indicate this. */
1180 #define RETURN_IN_MEMORY(TYPE) \
1181 ix86_return_in_memory (TYPE)
1184 /* Define the classes of registers for register constraints in the
1185 machine description. Also define ranges of constants.
1187 One of the classes must always be named ALL_REGS and include all hard regs.
1188 If there is more than one class, another class must be named NO_REGS
1189 and contain no registers.
1191 The name GENERAL_REGS must be the name of a class (or an alias for
1192 another name such as ALL_REGS). This is the class of registers
1193 that is allowed by "g" or "r" in a register constraint.
1194 Also, registers outside this class are allocated only when
1195 instructions express preferences for them.
1197 The classes must be numbered in nondecreasing order; that is,
1198 a larger-numbered class must never be contained completely
1199 in a smaller-numbered class.
1201 For any two classes, it is very desirable that there be another
1202 class that represents their union.
1204 It might seem that class BREG is unnecessary, since no useful 386
1205 opcode needs reg %ebx. But some systems pass args to the OS in ebx,
1206 and the "b" register constraint is useful in asms for syscalls.
1208 The flags and fpsr registers are in no class. */
1213 AREG, DREG, CREG, BREG, SIREG, DIREG,
1214 AD_REGS, /* %eax/%edx for DImode */
1215 Q_REGS, /* %eax %ebx %ecx %edx */
1216 NON_Q_REGS, /* %esi %edi %ebp %esp */
1217 INDEX_REGS, /* %eax %ebx %ecx %edx %esi %edi %ebp */
1218 LEGACY_REGS, /* %eax %ebx %ecx %edx %esi %edi %ebp %esp */
1219 GENERAL_REGS, /* %eax %ebx %ecx %edx %esi %edi %ebp %esp %r8 - %r15*/
1220 FP_TOP_REG, FP_SECOND_REG, /* %st(0) %st(1) */
1230 ALL_REGS, LIM_REG_CLASSES
1233 #define N_REG_CLASSES ((int) LIM_REG_CLASSES)
1235 #define INTEGER_CLASS_P(CLASS) \
1236 reg_class_subset_p ((CLASS), GENERAL_REGS)
1237 #define FLOAT_CLASS_P(CLASS) \
1238 reg_class_subset_p ((CLASS), FLOAT_REGS)
1239 #define SSE_CLASS_P(CLASS) \
1240 reg_class_subset_p ((CLASS), SSE_REGS)
1241 #define MMX_CLASS_P(CLASS) \
1242 reg_class_subset_p ((CLASS), MMX_REGS)
1243 #define MAYBE_INTEGER_CLASS_P(CLASS) \
1244 reg_classes_intersect_p ((CLASS), GENERAL_REGS)
1245 #define MAYBE_FLOAT_CLASS_P(CLASS) \
1246 reg_classes_intersect_p ((CLASS), FLOAT_REGS)
1247 #define MAYBE_SSE_CLASS_P(CLASS) \
1248 reg_classes_intersect_p (SSE_REGS, (CLASS))
1249 #define MAYBE_MMX_CLASS_P(CLASS) \
1250 reg_classes_intersect_p (MMX_REGS, (CLASS))
1252 #define Q_CLASS_P(CLASS) \
1253 reg_class_subset_p ((CLASS), Q_REGS)
1255 /* Give names of register classes as strings for dump file. */
1257 #define REG_CLASS_NAMES \
1259 "AREG", "DREG", "CREG", "BREG", \
1262 "Q_REGS", "NON_Q_REGS", \
1266 "FP_TOP_REG", "FP_SECOND_REG", \
1270 "FP_TOP_SSE_REGS", \
1271 "FP_SECOND_SSE_REGS", \
1275 "FLOAT_INT_SSE_REGS", \
1278 /* Define which registers fit in which classes.
1279 This is an initializer for a vector of HARD_REG_SET
1280 of length N_REG_CLASSES. */
1282 #define REG_CLASS_CONTENTS \
1284 { 0x01, 0x0 }, { 0x02, 0x0 }, /* AREG, DREG */ \
1285 { 0x04, 0x0 }, { 0x08, 0x0 }, /* CREG, BREG */ \
1286 { 0x10, 0x0 }, { 0x20, 0x0 }, /* SIREG, DIREG */ \
1287 { 0x03, 0x0 }, /* AD_REGS */ \
1288 { 0x0f, 0x0 }, /* Q_REGS */ \
1289 { 0x1100f0, 0x1fe0 }, /* NON_Q_REGS */ \
1290 { 0x7f, 0x1fe0 }, /* INDEX_REGS */ \
1291 { 0x1100ff, 0x0 }, /* LEGACY_REGS */ \
1292 { 0x1100ff, 0x1fe0 }, /* GENERAL_REGS */ \
1293 { 0x100, 0x0 }, { 0x0200, 0x0 },/* FP_TOP_REG, FP_SECOND_REG */\
1294 { 0xff00, 0x0 }, /* FLOAT_REGS */ \
1295 { 0x1fe00000,0x1fe000 }, /* SSE_REGS */ \
1296 { 0xe0000000, 0x1f }, /* MMX_REGS */ \
1297 { 0x1fe00100,0x1fe000 }, /* FP_TOP_SSE_REG */ \
1298 { 0x1fe00200,0x1fe000 }, /* FP_SECOND_SSE_REG */ \
1299 { 0x1fe0ff00,0x1fe000 }, /* FLOAT_SSE_REGS */ \
1300 { 0x1ffff, 0x1fe0 }, /* FLOAT_INT_REGS */ \
1301 { 0x1fe100ff,0x1fffe0 }, /* INT_SSE_REGS */ \
1302 { 0x1fe1ffff,0x1fffe0 }, /* FLOAT_INT_SSE_REGS */ \
1303 { 0xffffffff,0x1fffff } \
1306 /* The same information, inverted:
1307 Return the class number of the smallest class containing
1308 reg number REGNO. This could be a conditional expression
1309 or could index an array. */
1311 #define REGNO_REG_CLASS(REGNO) (regclass_map[REGNO])
1313 /* When defined, the compiler allows registers explicitly used in the
1314 rtl to be used as spill registers but prevents the compiler from
1315 extending the lifetime of these registers. */
1317 #define SMALL_REGISTER_CLASSES 1
1319 #define QI_REG_P(X) \
1320 (REG_P (X) && REGNO (X) < 4)
1322 #define GENERAL_REGNO_P(N) \
1323 ((N) < 8 || REX_INT_REGNO_P (N))
1325 #define GENERAL_REG_P(X) \
1326 (REG_P (X) && GENERAL_REGNO_P (REGNO (X)))
1328 #define ANY_QI_REG_P(X) (TARGET_64BIT ? GENERAL_REG_P(X) : QI_REG_P (X))
1330 #define NON_QI_REG_P(X) \
1331 (REG_P (X) && REGNO (X) >= 4 && REGNO (X) < FIRST_PSEUDO_REGISTER)
1333 #define REX_INT_REGNO_P(N) ((N) >= FIRST_REX_INT_REG && (N) <= LAST_REX_INT_REG)
1334 #define REX_INT_REG_P(X) (REG_P (X) && REX_INT_REGNO_P (REGNO (X)))
1336 #define FP_REG_P(X) (REG_P (X) && FP_REGNO_P (REGNO (X)))
1337 #define FP_REGNO_P(N) ((N) >= FIRST_STACK_REG && (N) <= LAST_STACK_REG)
1338 #define ANY_FP_REG_P(X) (REG_P (X) && ANY_FP_REGNO_P (REGNO (X)))
1339 #define ANY_FP_REGNO_P(N) (FP_REGNO_P (N) || SSE_REGNO_P (N))
1341 #define SSE_REGNO_P(N) \
1342 (((N) >= FIRST_SSE_REG && (N) <= LAST_SSE_REG) \
1343 || ((N) >= FIRST_REX_SSE_REG && (N) <= LAST_REX_SSE_REG))
1345 #define SSE_REGNO(N) \
1346 ((N) < 8 ? FIRST_SSE_REG + (N) : FIRST_REX_SSE_REG + (N) - 8)
1347 #define SSE_REG_P(N) (REG_P (N) && SSE_REGNO_P (REGNO (N)))
1349 #define SSE_FLOAT_MODE_P(MODE) \
1350 ((TARGET_SSE_MATH && (MODE) == SFmode) || (TARGET_SSE2 && (MODE) == DFmode))
1352 #define MMX_REGNO_P(N) ((N) >= FIRST_MMX_REG && (N) <= LAST_MMX_REG)
1353 #define MMX_REG_P(XOP) (REG_P (XOP) && MMX_REGNO_P (REGNO (XOP)))
1355 #define STACK_REG_P(XOP) \
1357 REGNO (XOP) >= FIRST_STACK_REG && \
1358 REGNO (XOP) <= LAST_STACK_REG)
1360 #define NON_STACK_REG_P(XOP) (REG_P (XOP) && ! STACK_REG_P (XOP))
1362 #define STACK_TOP_P(XOP) (REG_P (XOP) && REGNO (XOP) == FIRST_STACK_REG)
1364 #define CC_REG_P(X) (REG_P (X) && CC_REGNO_P (REGNO (X)))
1365 #define CC_REGNO_P(X) ((X) == FLAGS_REG || (X) == FPSR_REG)
1367 /* Indicate whether hard register numbered REG_NO should be converted
1369 #define CONVERT_HARD_REGISTER_TO_SSA_P(REG_NO) \
1370 ((REG_NO) == FLAGS_REG || (REG_NO) == ARG_POINTER_REGNUM)
1372 /* The class value for index registers, and the one for base regs. */
1374 #define INDEX_REG_CLASS INDEX_REGS
1375 #define BASE_REG_CLASS GENERAL_REGS
1377 /* Get reg_class from a letter such as appears in the machine description. */
1379 #define REG_CLASS_FROM_LETTER(C) \
1380 ((C) == 'r' ? GENERAL_REGS : \
1381 (C) == 'R' ? LEGACY_REGS : \
1382 (C) == 'q' ? TARGET_64BIT ? GENERAL_REGS : Q_REGS : \
1383 (C) == 'Q' ? Q_REGS : \
1384 (C) == 'f' ? (TARGET_80387 || TARGET_FLOAT_RETURNS_IN_80387 \
1387 (C) == 't' ? (TARGET_80387 || TARGET_FLOAT_RETURNS_IN_80387 \
1390 (C) == 'u' ? (TARGET_80387 || TARGET_FLOAT_RETURNS_IN_80387 \
1393 (C) == 'a' ? AREG : \
1394 (C) == 'b' ? BREG : \
1395 (C) == 'c' ? CREG : \
1396 (C) == 'd' ? DREG : \
1397 (C) == 'x' ? TARGET_SSE ? SSE_REGS : NO_REGS : \
1398 (C) == 'Y' ? TARGET_SSE2? SSE_REGS : NO_REGS : \
1399 (C) == 'y' ? TARGET_MMX ? MMX_REGS : NO_REGS : \
1400 (C) == 'A' ? AD_REGS : \
1401 (C) == 'D' ? DIREG : \
1402 (C) == 'S' ? SIREG : NO_REGS)
1404 /* The letters I, J, K, L and M in a register constraint string
1405 can be used to stand for particular ranges of immediate operands.
1406 This macro defines what the ranges are.
1407 C is the letter, and VALUE is a constant value.
1408 Return 1 if VALUE is in the range specified by C.
1410 I is for non-DImode shifts.
1411 J is for DImode shifts.
1412 K is for signed imm8 operands.
1413 L is for andsi as zero-extending move.
1414 M is for shifts that can be executed by the "lea" opcode.
1415 N is for immedaite operands for out/in instructions (0-255)
1418 #define CONST_OK_FOR_LETTER_P(VALUE, C) \
1419 ((C) == 'I' ? (VALUE) >= 0 && (VALUE) <= 31 \
1420 : (C) == 'J' ? (VALUE) >= 0 && (VALUE) <= 63 \
1421 : (C) == 'K' ? (VALUE) >= -128 && (VALUE) <= 127 \
1422 : (C) == 'L' ? (VALUE) == 0xff || (VALUE) == 0xffff \
1423 : (C) == 'M' ? (VALUE) >= 0 && (VALUE) <= 3 \
1424 : (C) == 'N' ? (VALUE) >= 0 && (VALUE) <= 255 \
1427 /* Similar, but for floating constants, and defining letters G and H.
1428 Here VALUE is the CONST_DOUBLE rtx itself. We allow constants even if
1429 TARGET_387 isn't set, because the stack register converter may need to
1430 load 0.0 into the function value register. */
1432 #define CONST_DOUBLE_OK_FOR_LETTER_P(VALUE, C) \
1433 ((C) == 'G' ? standard_80387_constant_p (VALUE) \
1434 : ((C) == 'H' ? standard_sse_constant_p (VALUE) : 0))
1436 /* A C expression that defines the optional machine-dependent
1437 constraint letters that can be used to segregate specific types of
1438 operands, usually memory references, for the target machine. Any
1439 letter that is not elsewhere defined and not matched by
1440 `REG_CLASS_FROM_LETTER' may be used. Normally this macro will not
1443 If it is required for a particular target machine, it should
1444 return 1 if VALUE corresponds to the operand type represented by
1445 the constraint letter C. If C is not defined as an extra
1446 constraint, the value returned should be 0 regardless of VALUE. */
1448 #define EXTRA_CONSTRAINT(VALUE, C) \
1449 ((C) == 'e' ? x86_64_sign_extended_value (VALUE) \
1450 : (C) == 'Z' ? x86_64_zero_extended_value (VALUE) \
1453 /* Place additional restrictions on the register class to use when it
1454 is necessary to be able to hold a value of mode MODE in a reload
1455 register for which class CLASS would ordinarily be used. */
1457 #define LIMIT_RELOAD_CLASS(MODE, CLASS) \
1458 ((MODE) == QImode && !TARGET_64BIT \
1459 && ((CLASS) == ALL_REGS || (CLASS) == GENERAL_REGS \
1460 || (CLASS) == LEGACY_REGS || (CLASS) == INDEX_REGS) \
1463 /* Given an rtx X being reloaded into a reg required to be
1464 in class CLASS, return the class of reg to actually use.
1465 In general this is just CLASS; but on some machines
1466 in some cases it is preferable to use a more restrictive class.
1467 On the 80386 series, we prevent floating constants from being
1468 reloaded into floating registers (since no move-insn can do that)
1469 and we ensure that QImodes aren't reloaded into the esi or edi reg. */
1471 /* Put float CONST_DOUBLE in the constant pool instead of fp regs.
1472 QImode must go into class Q_REGS.
1473 Narrow ALL_REGS to GENERAL_REGS. This supports allowing movsf and
1474 movdf to do mem-to-mem moves through integer regs. */
1476 #define PREFERRED_RELOAD_CLASS(X, CLASS) \
1477 ix86_preferred_reload_class ((X), (CLASS))
1479 /* If we are copying between general and FP registers, we need a memory
1480 location. The same is true for SSE and MMX registers. */
1481 #define SECONDARY_MEMORY_NEEDED(CLASS1, CLASS2, MODE) \
1482 ix86_secondary_memory_needed ((CLASS1), (CLASS2), (MODE), 1)
1484 /* QImode spills from non-QI registers need a scratch. This does not
1485 happen often -- the only example so far requires an uninitialized
1488 #define SECONDARY_OUTPUT_RELOAD_CLASS(CLASS, MODE, OUT) \
1489 (((CLASS) == GENERAL_REGS || (CLASS) == LEGACY_REGS \
1490 || (CLASS) == INDEX_REGS) && !TARGET_64BIT && (MODE) == QImode \
1493 /* Return the maximum number of consecutive registers
1494 needed to represent mode MODE in a register of class CLASS. */
1495 /* On the 80386, this is the size of MODE in words,
1496 except in the FP regs, where a single reg is always enough.
1497 The TFmodes are really just 80bit values, so we use only 3 registers
1498 to hold them, instead of 4, as the size would suggest.
1500 #define CLASS_MAX_NREGS(CLASS, MODE) \
1501 (!MAYBE_INTEGER_CLASS_P (CLASS) \
1502 ? (COMPLEX_MODE_P (MODE) ? 2 : 1) \
1503 : ((GET_MODE_SIZE ((MODE) == TFmode ? XFmode : (MODE)) \
1504 + UNITS_PER_WORD - 1) / UNITS_PER_WORD))
1506 /* A C expression whose value is nonzero if pseudos that have been
1507 assigned to registers of class CLASS would likely be spilled
1508 because registers of CLASS are needed for spill registers.
1510 The default value of this macro returns 1 if CLASS has exactly one
1511 register and zero otherwise. On most machines, this default
1512 should be used. Only define this macro to some other expression
1513 if pseudo allocated by `local-alloc.c' end up in memory because
1514 their hard registers were needed for spill registers. If this
1515 macro returns nonzero for those classes, those pseudos will only
1516 be allocated by `global.c', which knows how to reallocate the
1517 pseudo to another register. If there would not be another
1518 register available for reallocation, you should not change the
1519 definition of this macro since the only effect of such a
1520 definition would be to slow down register allocation. */
1522 #define CLASS_LIKELY_SPILLED_P(CLASS) \
1523 (((CLASS) == AREG) \
1524 || ((CLASS) == DREG) \
1525 || ((CLASS) == CREG) \
1526 || ((CLASS) == BREG) \
1527 || ((CLASS) == AD_REGS) \
1528 || ((CLASS) == SIREG) \
1529 || ((CLASS) == DIREG))
1531 /* A C statement that adds to CLOBBERS any hard regs the port wishes
1532 to automatically clobber for all asms.
1534 We do this in the new i386 backend to maintain source compatibility
1535 with the old cc0-based compiler. */
1537 #define MD_ASM_CLOBBERS(CLOBBERS) \
1539 (CLOBBERS) = tree_cons (NULL_TREE, build_string (5, "flags"), \
1541 (CLOBBERS) = tree_cons (NULL_TREE, build_string (4, "fpsr"), \
1543 (CLOBBERS) = tree_cons (NULL_TREE, build_string (7, "dirflag"), \
1547 /* Stack layout; function entry, exit and calling. */
1549 /* Define this if pushing a word on the stack
1550 makes the stack pointer a smaller address. */
1551 #define STACK_GROWS_DOWNWARD
1553 /* Define this if the nominal address of the stack frame
1554 is at the high-address end of the local variables;
1555 that is, each additional local variable allocated
1556 goes at a more negative offset in the frame. */
1557 #define FRAME_GROWS_DOWNWARD
1559 /* Offset within stack frame to start allocating local variables at.
1560 If FRAME_GROWS_DOWNWARD, this is the offset to the END of the
1561 first local allocated. Otherwise, it is the offset to the BEGINNING
1562 of the first local allocated. */
1563 #define STARTING_FRAME_OFFSET 0
1565 /* If we generate an insn to push BYTES bytes,
1566 this says how many the stack pointer really advances by.
1567 On 386 pushw decrements by exactly 2 no matter what the position was.
1568 On the 386 there is no pushb; we use pushw instead, and this
1569 has the effect of rounding up to 2.
1571 For 64bit ABI we round up to 8 bytes.
1574 #define PUSH_ROUNDING(BYTES) \
1576 ? (((BYTES) + 7) & (-8)) \
1577 : (((BYTES) + 1) & (-2)))
1579 /* If defined, the maximum amount of space required for outgoing arguments will
1580 be computed and placed into the variable
1581 `current_function_outgoing_args_size'. No space will be pushed onto the
1582 stack for each call; instead, the function prologue should increase the stack
1583 frame size by this amount. */
1585 #define ACCUMULATE_OUTGOING_ARGS TARGET_ACCUMULATE_OUTGOING_ARGS
1587 /* If defined, a C expression whose value is nonzero when we want to use PUSH
1588 instructions to pass outgoing arguments. */
1590 #define PUSH_ARGS (TARGET_PUSH_ARGS && !ACCUMULATE_OUTGOING_ARGS)
1592 /* Offset of first parameter from the argument pointer register value. */
1593 #define FIRST_PARM_OFFSET(FNDECL) 0
1595 /* Define this macro if functions should assume that stack space has been
1596 allocated for arguments even when their values are passed in registers.
1598 The value of this macro is the size, in bytes, of the area reserved for
1599 arguments passed in registers for the function represented by FNDECL.
1601 This space can be allocated by the caller, or be a part of the
1602 machine-dependent stack frame: `OUTGOING_REG_PARM_STACK_SPACE' says
1604 #define REG_PARM_STACK_SPACE(FNDECL) 0
1606 /* Define as a C expression that evaluates to nonzero if we do not know how
1607 to pass TYPE solely in registers. The file expr.h defines a
1608 definition that is usually appropriate, refer to expr.h for additional
1609 documentation. If `REG_PARM_STACK_SPACE' is defined, the argument will be
1610 computed in the stack and then loaded into a register. */
1611 #define MUST_PASS_IN_STACK(MODE, TYPE) \
1613 && (TREE_CODE (TYPE_SIZE (TYPE)) != INTEGER_CST \
1614 || TREE_ADDRESSABLE (TYPE) \
1615 || ((MODE) == TImode) \
1616 || ((MODE) == BLKmode \
1618 && TREE_CODE (TYPE_SIZE (TYPE)) == INTEGER_CST \
1619 && 0 == (int_size_in_bytes (TYPE) \
1620 % (PARM_BOUNDARY / BITS_PER_UNIT))) \
1621 && (FUNCTION_ARG_PADDING (MODE, TYPE) \
1622 == (BYTES_BIG_ENDIAN ? upward : downward)))))
1624 /* Value is the number of bytes of arguments automatically
1625 popped when returning from a subroutine call.
1626 FUNDECL is the declaration node of the function (as a tree),
1627 FUNTYPE is the data type of the function (as a tree),
1628 or for a library call it is an identifier node for the subroutine name.
1629 SIZE is the number of bytes of arguments passed on the stack.
1631 On the 80386, the RTD insn may be used to pop them if the number
1632 of args is fixed, but if the number is variable then the caller
1633 must pop them all. RTD can't be used for library calls now
1634 because the library is compiled with the Unix compiler.
1635 Use of RTD is a selectable option, since it is incompatible with
1636 standard Unix calling sequences. If the option is not selected,
1637 the caller must always pop the args.
1639 The attribute stdcall is equivalent to RTD on a per module basis. */
1641 #define RETURN_POPS_ARGS(FUNDECL, FUNTYPE, SIZE) \
1642 ix86_return_pops_args ((FUNDECL), (FUNTYPE), (SIZE))
1644 /* Define how to find the value returned by a function.
1645 VALTYPE is the data type of the value (as a tree).
1646 If the precise function being called is known, FUNC is its FUNCTION_DECL;
1647 otherwise, FUNC is 0. */
1648 #define FUNCTION_VALUE(VALTYPE, FUNC) \
1649 ix86_function_value (VALTYPE)
1651 #define FUNCTION_VALUE_REGNO_P(N) \
1652 ix86_function_value_regno_p (N)
1654 /* Define how to find the value returned by a library function
1655 assuming the value has mode MODE. */
1657 #define LIBCALL_VALUE(MODE) \
1658 ix86_libcall_value (MODE)
1660 /* Define the size of the result block used for communication between
1661 untyped_call and untyped_return. The block contains a DImode value
1662 followed by the block used by fnsave and frstor. */
1664 #define APPLY_RESULT_SIZE (8+108)
1666 /* 1 if N is a possible register number for function argument passing. */
1667 #define FUNCTION_ARG_REGNO_P(N) ix86_function_arg_regno_p (N)
1669 /* Define a data type for recording info about an argument list
1670 during the scan of that argument list. This data type should
1671 hold all necessary information about the function itself
1672 and about the args processed so far, enough to enable macros
1673 such as FUNCTION_ARG to determine where the next arg should go. */
1675 typedef struct ix86_args {
1676 int words; /* # words passed so far */
1677 int nregs; /* # registers available for passing */
1678 int regno; /* next available register number */
1679 int sse_words; /* # sse words passed so far */
1680 int sse_nregs; /* # sse registers available for passing */
1681 int sse_regno; /* next available sse register number */
1682 int maybe_vaarg; /* true for calls to possibly vardic fncts. */
1685 /* Initialize a variable CUM of type CUMULATIVE_ARGS
1686 for a call to a function whose data type is FNTYPE.
1687 For a library call, FNTYPE is 0. */
1689 #define INIT_CUMULATIVE_ARGS(CUM, FNTYPE, LIBNAME, INDIRECT) \
1690 init_cumulative_args (&(CUM), (FNTYPE), (LIBNAME))
1692 /* Update the data in CUM to advance over an argument
1693 of mode MODE and data type TYPE.
1694 (TYPE is null for libcalls where that information may not be available.) */
1696 #define FUNCTION_ARG_ADVANCE(CUM, MODE, TYPE, NAMED) \
1697 function_arg_advance (&(CUM), (MODE), (TYPE), (NAMED))
1699 /* Define where to put the arguments to a function.
1700 Value is zero to push the argument on the stack,
1701 or a hard register in which to store the argument.
1703 MODE is the argument's machine mode.
1704 TYPE is the data type of the argument (as a tree).
1705 This is null for libcalls where that information may
1707 CUM is a variable of type CUMULATIVE_ARGS which gives info about
1708 the preceding args and about the function being called.
1709 NAMED is nonzero if this argument is a named parameter
1710 (otherwise it is an extra parameter matching an ellipsis). */
1712 #define FUNCTION_ARG(CUM, MODE, TYPE, NAMED) \
1713 function_arg (&(CUM), (MODE), (TYPE), (NAMED))
1715 /* For an arg passed partly in registers and partly in memory,
1716 this is the number of registers used.
1717 For args passed entirely in registers or entirely in memory, zero. */
1719 #define FUNCTION_ARG_PARTIAL_NREGS(CUM, MODE, TYPE, NAMED) 0
1721 /* If PIC, we cannot make sibling calls to global functions
1722 because the PLT requires %ebx live.
1723 If we are returning floats on the register stack, we cannot make
1724 sibling calls to functions that return floats. (The stack adjust
1725 instruction will wind up after the sibcall jump, and not be executed.) */
1726 #define FUNCTION_OK_FOR_SIBCALL(DECL) \
1728 && (! flag_pic || ! TREE_PUBLIC (DECL)) \
1729 && (! TARGET_FLOAT_RETURNS_IN_80387 \
1730 || ! FLOAT_MODE_P (TYPE_MODE (TREE_TYPE (TREE_TYPE (DECL)))) \
1731 || FLOAT_MODE_P (TYPE_MODE (TREE_TYPE (TREE_TYPE (cfun->decl))))))
1733 /* Perform any needed actions needed for a function that is receiving a
1734 variable number of arguments.
1738 MODE and TYPE are the mode and type of the current parameter.
1740 PRETEND_SIZE is a variable that should be set to the amount of stack
1741 that must be pushed by the prolog to pretend that our caller pushed
1744 Normally, this macro will push all remaining incoming registers on the
1745 stack and set PRETEND_SIZE to the length of the registers pushed. */
1747 #define SETUP_INCOMING_VARARGS(CUM, MODE, TYPE, PRETEND_SIZE, NO_RTL) \
1748 ix86_setup_incoming_varargs (&(CUM), (MODE), (TYPE), &(PRETEND_SIZE), \
1751 /* Define the `__builtin_va_list' type for the ABI. */
1752 #define BUILD_VA_LIST_TYPE(VALIST) \
1753 ((VALIST) = ix86_build_va_list ())
1755 /* Implement `va_start' for varargs and stdarg. */
1756 #define EXPAND_BUILTIN_VA_START(STDARG, VALIST, NEXTARG) \
1757 ix86_va_start ((STDARG), (VALIST), (NEXTARG))
1759 /* Implement `va_arg'. */
1760 #define EXPAND_BUILTIN_VA_ARG(VALIST, TYPE) \
1761 ix86_va_arg ((VALIST), (TYPE))
1763 /* This macro is invoked at the end of compilation. It is used here to
1764 output code for -fpic that will load the return address into %ebx. */
1767 #define ASM_FILE_END(FILE) ix86_asm_file_end (FILE)
1769 /* Output assembler code to FILE to increment profiler label # LABELNO
1770 for profiling a function entry. */
1772 #define FUNCTION_PROFILER(FILE, LABELNO) \
1776 fprintf ((FILE), "\tleal\t%sP%d@GOTOFF(%%ebx),%%edx\n", \
1777 LPREFIX, (LABELNO)); \
1778 fprintf ((FILE), "\tcall\t*_mcount@GOT(%%ebx)\n"); \
1782 fprintf ((FILE), "\tmovl\t$%sP%d,%%edx\n", LPREFIX, (LABELNO)); \
1783 fprintf ((FILE), "\tcall\t_mcount\n"); \
1787 /* EXIT_IGNORE_STACK should be nonzero if, when returning from a function,
1788 the stack pointer does not matter. The value is tested only in
1789 functions that have frame pointers.
1790 No definition is equivalent to always zero. */
1791 /* Note on the 386 it might be more efficient not to define this since
1792 we have to restore it ourselves from the frame pointer, in order to
1795 #define EXIT_IGNORE_STACK 1
1797 /* Output assembler code for a block containing the constant parts
1798 of a trampoline, leaving space for the variable parts. */
1800 /* On the 386, the trampoline contains two instructions:
1803 The trampoline is generated entirely at runtime. The operand of JMP
1804 is the address of FUNCTION relative to the instruction following the
1805 JMP (which is 5 bytes long). */
1807 /* Length in units of the trampoline for entering a nested function. */
1809 #define TRAMPOLINE_SIZE (TARGET_64BIT ? 23 : 10)
1811 /* Emit RTL insns to initialize the variable parts of a trampoline.
1812 FNADDR is an RTX for the address of the function's pure code.
1813 CXT is an RTX for the static chain value for the function. */
1815 #define INITIALIZE_TRAMPOLINE(TRAMP, FNADDR, CXT) \
1816 x86_initialize_trampoline ((TRAMP), (FNADDR), (CXT))
1818 /* Definitions for register eliminations.
1820 This is an array of structures. Each structure initializes one pair
1821 of eliminable registers. The "from" register number is given first,
1822 followed by "to". Eliminations of the same "from" register are listed
1823 in order of preference.
1825 There are two registers that can always be eliminated on the i386.
1826 The frame pointer and the arg pointer can be replaced by either the
1827 hard frame pointer or to the stack pointer, depending upon the
1828 circumstances. The hard frame pointer is not used before reload and
1829 so it is not eligible for elimination. */
1831 #define ELIMINABLE_REGS \
1832 {{ ARG_POINTER_REGNUM, STACK_POINTER_REGNUM}, \
1833 { ARG_POINTER_REGNUM, HARD_FRAME_POINTER_REGNUM}, \
1834 { FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM}, \
1835 { FRAME_POINTER_REGNUM, HARD_FRAME_POINTER_REGNUM}} \
1837 /* Given FROM and TO register numbers, say whether this elimination is
1838 allowed. Frame pointer elimination is automatically handled.
1840 All other eliminations are valid. */
1842 #define CAN_ELIMINATE(FROM, TO) \
1843 ((TO) == STACK_POINTER_REGNUM ? ! frame_pointer_needed : 1)
1845 /* Define the offset between two registers, one to be eliminated, and the other
1846 its replacement, at the start of a routine. */
1848 #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET) \
1849 ((OFFSET) = ix86_initial_elimination_offset ((FROM), (TO)))
1851 /* Addressing modes, and classification of registers for them. */
1853 /* #define HAVE_POST_INCREMENT 0 */
1854 /* #define HAVE_POST_DECREMENT 0 */
1856 /* #define HAVE_PRE_DECREMENT 0 */
1857 /* #define HAVE_PRE_INCREMENT 0 */
1859 /* Macros to check register numbers against specific register classes. */
1861 /* These assume that REGNO is a hard or pseudo reg number.
1862 They give nonzero only if REGNO is a hard reg of the suitable class
1863 or a pseudo reg currently allocated to a suitable hard reg.
1864 Since they use reg_renumber, they are safe only once reg_renumber
1865 has been allocated, which happens in local-alloc.c. */
1867 #define REGNO_OK_FOR_INDEX_P(REGNO) \
1868 ((REGNO) < STACK_POINTER_REGNUM \
1869 || (REGNO >= FIRST_REX_INT_REG \
1870 && (REGNO) <= LAST_REX_INT_REG) \
1871 || ((unsigned) reg_renumber[(REGNO)] >= FIRST_REX_INT_REG \
1872 && (unsigned) reg_renumber[(REGNO)] <= LAST_REX_INT_REG) \
1873 || (unsigned) reg_renumber[(REGNO)] < STACK_POINTER_REGNUM)
1875 #define REGNO_OK_FOR_BASE_P(REGNO) \
1876 ((REGNO) <= STACK_POINTER_REGNUM \
1877 || (REGNO) == ARG_POINTER_REGNUM \
1878 || (REGNO) == FRAME_POINTER_REGNUM \
1879 || (REGNO >= FIRST_REX_INT_REG \
1880 && (REGNO) <= LAST_REX_INT_REG) \
1881 || ((unsigned) reg_renumber[(REGNO)] >= FIRST_REX_INT_REG \
1882 && (unsigned) reg_renumber[(REGNO)] <= LAST_REX_INT_REG) \
1883 || (unsigned) reg_renumber[(REGNO)] <= STACK_POINTER_REGNUM)
1885 #define REGNO_OK_FOR_SIREG_P(REGNO) \
1886 ((REGNO) == 4 || reg_renumber[(REGNO)] == 4)
1887 #define REGNO_OK_FOR_DIREG_P(REGNO) \
1888 ((REGNO) == 5 || reg_renumber[(REGNO)] == 5)
1890 /* The macros REG_OK_FOR..._P assume that the arg is a REG rtx
1891 and check its validity for a certain class.
1892 We have two alternate definitions for each of them.
1893 The usual definition accepts all pseudo regs; the other rejects
1894 them unless they have been allocated suitable hard regs.
1895 The symbol REG_OK_STRICT causes the latter definition to be used.
1897 Most source files want to accept pseudo regs in the hope that
1898 they will get allocated to the class that the insn wants them to be in.
1899 Source files for reload pass need to be strict.
1900 After reload, it makes no difference, since pseudo regs have
1901 been eliminated by then. */
1904 /* Non strict versions, pseudos are ok */
1905 #define REG_OK_FOR_INDEX_NONSTRICT_P(X) \
1906 (REGNO (X) < STACK_POINTER_REGNUM \
1907 || (REGNO (X) >= FIRST_REX_INT_REG \
1908 && REGNO (X) <= LAST_REX_INT_REG) \
1909 || REGNO (X) >= FIRST_PSEUDO_REGISTER)
1911 #define REG_OK_FOR_BASE_NONSTRICT_P(X) \
1912 (REGNO (X) <= STACK_POINTER_REGNUM \
1913 || REGNO (X) == ARG_POINTER_REGNUM \
1914 || REGNO (X) == FRAME_POINTER_REGNUM \
1915 || (REGNO (X) >= FIRST_REX_INT_REG \
1916 && REGNO (X) <= LAST_REX_INT_REG) \
1917 || REGNO (X) >= FIRST_PSEUDO_REGISTER)
1919 /* Strict versions, hard registers only */
1920 #define REG_OK_FOR_INDEX_STRICT_P(X) REGNO_OK_FOR_INDEX_P (REGNO (X))
1921 #define REG_OK_FOR_BASE_STRICT_P(X) REGNO_OK_FOR_BASE_P (REGNO (X))
1923 #ifndef REG_OK_STRICT
1924 #define REG_OK_FOR_INDEX_P(X) REG_OK_FOR_INDEX_NONSTRICT_P (X)
1925 #define REG_OK_FOR_BASE_P(X) REG_OK_FOR_BASE_NONSTRICT_P (X)
1928 #define REG_OK_FOR_INDEX_P(X) REG_OK_FOR_INDEX_STRICT_P (X)
1929 #define REG_OK_FOR_BASE_P(X) REG_OK_FOR_BASE_STRICT_P (X)
1932 /* GO_IF_LEGITIMATE_ADDRESS recognizes an RTL expression
1933 that is a valid memory address for an instruction.
1934 The MODE argument is the machine mode for the MEM expression
1935 that wants to use this address.
1937 The other macros defined here are used only in GO_IF_LEGITIMATE_ADDRESS,
1938 except for CONSTANT_ADDRESS_P which is usually machine-independent.
1940 See legitimize_pic_address in i386.c for details as to what
1941 constitutes a legitimate address when -fpic is used. */
1943 #define MAX_REGS_PER_ADDRESS 2
1945 #define CONSTANT_ADDRESS_P(X) \
1946 (GET_CODE (X) == LABEL_REF || GET_CODE (X) == SYMBOL_REF \
1947 || GET_CODE (X) == CONST_INT || GET_CODE (X) == CONST \
1948 || GET_CODE (X) == CONST_DOUBLE)
1950 /* Nonzero if the constant value X is a legitimate general operand.
1951 It is given that X satisfies CONSTANT_P or is a CONST_DOUBLE. */
1953 #define LEGITIMATE_CONSTANT_P(X) 1
1955 #ifdef REG_OK_STRICT
1956 #define GO_IF_LEGITIMATE_ADDRESS(MODE, X, ADDR) \
1958 if (legitimate_address_p ((MODE), (X), 1)) \
1963 #define GO_IF_LEGITIMATE_ADDRESS(MODE, X, ADDR) \
1965 if (legitimate_address_p ((MODE), (X), 0)) \
1971 /* If defined, a C expression to determine the base term of address X.
1972 This macro is used in only one place: `find_base_term' in alias.c.
1974 It is always safe for this macro to not be defined. It exists so
1975 that alias analysis can understand machine-dependent addresses.
1977 The typical use of this macro is to handle addresses containing
1978 a label_ref or symbol_ref within an UNSPEC. */
1980 #define FIND_BASE_TERM(X) ix86_find_base_term (X)
1982 /* Try machine-dependent ways of modifying an illegitimate address
1983 to be legitimate. If we find one, return the new, valid address.
1984 This macro is used in only one place: `memory_address' in explow.c.
1986 OLDX is the address as it was before break_out_memory_refs was called.
1987 In some cases it is useful to look at this to decide what needs to be done.
1989 MODE and WIN are passed so that this macro can use
1990 GO_IF_LEGITIMATE_ADDRESS.
1992 It is always safe for this macro to do nothing. It exists to recognize
1993 opportunities to optimize the output.
1995 For the 80386, we handle X+REG by loading X into a register R and
1996 using R+REG. R will go in a general reg and indexing will be used.
1997 However, if REG is a broken-out memory address or multiplication,
1998 nothing needs to be done because REG can certainly go in a general reg.
2000 When -fpic is used, special handling is needed for symbolic references.
2001 See comments by legitimize_pic_address in i386.c for details. */
2003 #define LEGITIMIZE_ADDRESS(X, OLDX, MODE, WIN) \
2005 (X) = legitimize_address ((X), (OLDX), (MODE)); \
2006 if (memory_address_p ((MODE), (X))) \
2010 #define REWRITE_ADDRESS(X) rewrite_address (X)
2012 /* Nonzero if the constant value X is a legitimate general operand
2013 when generating PIC code. It is given that flag_pic is on and
2014 that X satisfies CONSTANT_P or is a CONST_DOUBLE. */
2016 #define LEGITIMATE_PIC_OPERAND_P(X) \
2017 (! SYMBOLIC_CONST (X) \
2018 || legitimate_pic_address_disp_p (X))
2020 #define SYMBOLIC_CONST(X) \
2021 (GET_CODE (X) == SYMBOL_REF \
2022 || GET_CODE (X) == LABEL_REF \
2023 || (GET_CODE (X) == CONST && symbolic_reference_mentioned_p (X)))
2025 /* Go to LABEL if ADDR (a legitimate address expression)
2026 has an effect that depends on the machine mode it is used for.
2027 On the 80386, only postdecrement and postincrement address depend thus
2028 (the amount of decrement or increment being the length of the operand). */
2029 #define GO_IF_MODE_DEPENDENT_ADDRESS(ADDR, LABEL) \
2031 if (GET_CODE (ADDR) == POST_INC \
2032 || GET_CODE (ADDR) == POST_DEC) \
2036 /* Codes for all the SSE/MMX builtins. */
2048 IX86_BUILTIN_CMPEQPS,
2049 IX86_BUILTIN_CMPLTPS,
2050 IX86_BUILTIN_CMPLEPS,
2051 IX86_BUILTIN_CMPGTPS,
2052 IX86_BUILTIN_CMPGEPS,
2053 IX86_BUILTIN_CMPNEQPS,
2054 IX86_BUILTIN_CMPNLTPS,
2055 IX86_BUILTIN_CMPNLEPS,
2056 IX86_BUILTIN_CMPNGTPS,
2057 IX86_BUILTIN_CMPNGEPS,
2058 IX86_BUILTIN_CMPORDPS,
2059 IX86_BUILTIN_CMPUNORDPS,
2060 IX86_BUILTIN_CMPNEPS,
2061 IX86_BUILTIN_CMPEQSS,
2062 IX86_BUILTIN_CMPLTSS,
2063 IX86_BUILTIN_CMPLESS,
2064 IX86_BUILTIN_CMPGTSS,
2065 IX86_BUILTIN_CMPGESS,
2066 IX86_BUILTIN_CMPNEQSS,
2067 IX86_BUILTIN_CMPNLTSS,
2068 IX86_BUILTIN_CMPNLESS,
2069 IX86_BUILTIN_CMPNGTSS,
2070 IX86_BUILTIN_CMPNGESS,
2071 IX86_BUILTIN_CMPORDSS,
2072 IX86_BUILTIN_CMPUNORDSS,
2073 IX86_BUILTIN_CMPNESS,
2075 IX86_BUILTIN_COMIEQSS,
2076 IX86_BUILTIN_COMILTSS,
2077 IX86_BUILTIN_COMILESS,
2078 IX86_BUILTIN_COMIGTSS,
2079 IX86_BUILTIN_COMIGESS,
2080 IX86_BUILTIN_COMINEQSS,
2081 IX86_BUILTIN_UCOMIEQSS,
2082 IX86_BUILTIN_UCOMILTSS,
2083 IX86_BUILTIN_UCOMILESS,
2084 IX86_BUILTIN_UCOMIGTSS,
2085 IX86_BUILTIN_UCOMIGESS,
2086 IX86_BUILTIN_UCOMINEQSS,
2088 IX86_BUILTIN_CVTPI2PS,
2089 IX86_BUILTIN_CVTPS2PI,
2090 IX86_BUILTIN_CVTSI2SS,
2091 IX86_BUILTIN_CVTSS2SI,
2092 IX86_BUILTIN_CVTTPS2PI,
2093 IX86_BUILTIN_CVTTSS2SI,
2100 IX86_BUILTIN_LOADAPS,
2101 IX86_BUILTIN_LOADUPS,
2102 IX86_BUILTIN_STOREAPS,
2103 IX86_BUILTIN_STOREUPS,
2104 IX86_BUILTIN_LOADSS,
2105 IX86_BUILTIN_STORESS,
2108 IX86_BUILTIN_MOVHLPS,
2109 IX86_BUILTIN_MOVLHPS,
2110 IX86_BUILTIN_LOADHPS,
2111 IX86_BUILTIN_LOADLPS,
2112 IX86_BUILTIN_STOREHPS,
2113 IX86_BUILTIN_STORELPS,
2115 IX86_BUILTIN_MASKMOVQ,
2116 IX86_BUILTIN_MOVMSKPS,
2117 IX86_BUILTIN_PMOVMSKB,
2119 IX86_BUILTIN_MOVNTPS,
2120 IX86_BUILTIN_MOVNTQ,
2122 IX86_BUILTIN_PACKSSWB,
2123 IX86_BUILTIN_PACKSSDW,
2124 IX86_BUILTIN_PACKUSWB,
2129 IX86_BUILTIN_PADDSB,
2130 IX86_BUILTIN_PADDSW,
2131 IX86_BUILTIN_PADDUSB,
2132 IX86_BUILTIN_PADDUSW,
2136 IX86_BUILTIN_PSUBSB,
2137 IX86_BUILTIN_PSUBSW,
2138 IX86_BUILTIN_PSUBUSB,
2139 IX86_BUILTIN_PSUBUSW,
2149 IX86_BUILTIN_PCMPEQB,
2150 IX86_BUILTIN_PCMPEQW,
2151 IX86_BUILTIN_PCMPEQD,
2152 IX86_BUILTIN_PCMPGTB,
2153 IX86_BUILTIN_PCMPGTW,
2154 IX86_BUILTIN_PCMPGTD,
2156 IX86_BUILTIN_PEXTRW,
2157 IX86_BUILTIN_PINSRW,
2159 IX86_BUILTIN_PMADDWD,
2161 IX86_BUILTIN_PMAXSW,
2162 IX86_BUILTIN_PMAXUB,
2163 IX86_BUILTIN_PMINSW,
2164 IX86_BUILTIN_PMINUB,
2166 IX86_BUILTIN_PMULHUW,
2167 IX86_BUILTIN_PMULHW,
2168 IX86_BUILTIN_PMULLW,
2170 IX86_BUILTIN_PSADBW,
2171 IX86_BUILTIN_PSHUFW,
2181 IX86_BUILTIN_PSLLWI,
2182 IX86_BUILTIN_PSLLDI,
2183 IX86_BUILTIN_PSLLQI,
2184 IX86_BUILTIN_PSRAWI,
2185 IX86_BUILTIN_PSRADI,
2186 IX86_BUILTIN_PSRLWI,
2187 IX86_BUILTIN_PSRLDI,
2188 IX86_BUILTIN_PSRLQI,
2190 IX86_BUILTIN_PUNPCKHBW,
2191 IX86_BUILTIN_PUNPCKHWD,
2192 IX86_BUILTIN_PUNPCKHDQ,
2193 IX86_BUILTIN_PUNPCKLBW,
2194 IX86_BUILTIN_PUNPCKLWD,
2195 IX86_BUILTIN_PUNPCKLDQ,
2197 IX86_BUILTIN_SHUFPS,
2201 IX86_BUILTIN_RSQRTPS,
2202 IX86_BUILTIN_RSQRTSS,
2203 IX86_BUILTIN_SQRTPS,
2204 IX86_BUILTIN_SQRTSS,
2206 IX86_BUILTIN_UNPCKHPS,
2207 IX86_BUILTIN_UNPCKLPS,
2210 IX86_BUILTIN_ANDNPS,
2215 IX86_BUILTIN_LDMXCSR,
2216 IX86_BUILTIN_STMXCSR,
2217 IX86_BUILTIN_SFENCE,
2219 /* 3DNow! Original */
2221 IX86_BUILTIN_PAVGUSB,
2225 IX86_BUILTIN_PFCMPEQ,
2226 IX86_BUILTIN_PFCMPGE,
2227 IX86_BUILTIN_PFCMPGT,
2232 IX86_BUILTIN_PFRCPIT1,
2233 IX86_BUILTIN_PFRCPIT2,
2234 IX86_BUILTIN_PFRSQIT1,
2235 IX86_BUILTIN_PFRSQRT,
2237 IX86_BUILTIN_PFSUBR,
2239 IX86_BUILTIN_PMULHRW,
2241 /* 3DNow! Athlon Extensions */
2243 IX86_BUILTIN_PFNACC,
2244 IX86_BUILTIN_PFPNACC,
2246 IX86_BUILTIN_PSWAPDSI,
2247 IX86_BUILTIN_PSWAPDSF,
2249 IX86_BUILTIN_SSE_ZERO,
2250 IX86_BUILTIN_MMX_ZERO,
2255 /* Define this macro if references to a symbol must be treated
2256 differently depending on something about the variable or
2257 function named by the symbol (such as what section it is in).
2259 On i386, if using PIC, mark a SYMBOL_REF for a non-global symbol
2260 so that we may access it directly in the GOT. */
2262 #define ENCODE_SECTION_INFO(DECL) \
2266 rtx rtl = (TREE_CODE_CLASS (TREE_CODE (DECL)) != 'd' \
2267 ? TREE_CST_RTL (DECL) : DECL_RTL (DECL)); \
2269 if (GET_CODE (rtl) == MEM) \
2271 if (TARGET_DEBUG_ADDR \
2272 && TREE_CODE_CLASS (TREE_CODE (DECL)) == 'd') \
2274 fprintf (stderr, "Encode %s, public = %d\n", \
2275 IDENTIFIER_POINTER (DECL_NAME (DECL)), \
2276 TREE_PUBLIC (DECL)); \
2279 SYMBOL_REF_FLAG (XEXP (rtl, 0)) \
2280 = (TREE_CODE_CLASS (TREE_CODE (DECL)) != 'd' \
2281 || ! TREE_PUBLIC (DECL)); \
2286 /* The `FINALIZE_PIC' macro serves as a hook to emit these special
2287 codes once the function is being compiled into assembly code, but
2288 not before. (It is not done before, because in the case of
2289 compiling an inline function, it would lead to multiple PIC
2290 prologues being included in functions which used inline functions
2291 and were compiled to assembly language.) */
2293 #define FINALIZE_PIC \
2294 (current_function_uses_pic_offset_table |= current_function_profile)
2297 /* Max number of args passed in registers. If this is more than 3, we will
2298 have problems with ebx (register #4), since it is a caller save register and
2299 is also used as the pic register in ELF. So for now, don't allow more than
2300 3 registers to be passed in registers. */
2302 #define REGPARM_MAX (TARGET_64BIT ? 6 : 3)
2304 #define SSE_REGPARM_MAX (TARGET_64BIT ? 8 : 0)
2307 /* Specify the machine mode that this machine uses
2308 for the index in the tablejump instruction. */
2309 #define CASE_VECTOR_MODE (!TARGET_64BIT || flag_pic ? SImode : DImode)
2311 /* Define as C expression which evaluates to nonzero if the tablejump
2312 instruction expects the table to contain offsets from the address of the
2314 Do not define this if the table should contain absolute addresses. */
2315 /* #define CASE_VECTOR_PC_RELATIVE 1 */
2317 /* Define this as 1 if `char' should by default be signed; else as 0. */
2318 #define DEFAULT_SIGNED_CHAR 1
2320 /* Number of bytes moved into a data cache for a single prefetch operation. */
2321 #define PREFETCH_BLOCK ix86_cost->prefetch_block
2323 /* Number of prefetch operations that can be done in parallel. */
2324 #define SIMULTANEOUS_PREFETCHES ix86_cost->simultaneous_prefetches
2326 /* Max number of bytes we can move from memory to memory
2327 in one reasonably fast instruction. */
2330 /* MOVE_MAX_PIECES is the number of bytes at a time which we can
2331 move efficiently, as opposed to MOVE_MAX which is the maximum
2332 number of bytes we can move with a single instruction. */
2333 #define MOVE_MAX_PIECES (TARGET_64BIT ? 8 : 4)
2335 /* If a memory-to-memory move would take MOVE_RATIO or more simple
2336 move-instruction pairs, we will do a movstr or libcall instead.
2337 Increasing the value will always make code faster, but eventually
2338 incurs high cost in increased code size.
2340 If you don't define this, a reasonable default is used. */
2342 #define MOVE_RATIO (optimize_size ? 3 : ix86_cost->move_ratio)
2344 /* Define if shifts truncate the shift count
2345 which implies one can omit a sign-extension or zero-extension
2346 of a shift count. */
2347 /* On i386, shifts do truncate the count. But bit opcodes don't. */
2349 /* #define SHIFT_COUNT_TRUNCATED */
2351 /* Value is 1 if truncating an integer of INPREC bits to OUTPREC bits
2352 is done just by pretending it is already truncated. */
2353 #define TRULY_NOOP_TRUNCATION(OUTPREC, INPREC) 1
2355 /* We assume that the store-condition-codes instructions store 0 for false
2356 and some other value for true. This is the value stored for true. */
2358 #define STORE_FLAG_VALUE 1
2360 /* When a prototype says `char' or `short', really pass an `int'.
2361 (The 386 can't easily push less than an int.) */
2363 #define PROMOTE_PROTOTYPES 1
2365 /* A macro to update M and UNSIGNEDP when an object whose type is
2366 TYPE and which has the specified mode and signedness is to be
2367 stored in a register. This macro is only called when TYPE is a
2370 On i386 it is sometimes useful to promote HImode and QImode
2371 quantities to SImode. The choice depends on target type. */
2373 #define PROMOTE_MODE(MODE, UNSIGNEDP, TYPE) \
2375 if (((MODE) == HImode && TARGET_PROMOTE_HI_REGS) \
2376 || ((MODE) == QImode && TARGET_PROMOTE_QI_REGS)) \
2380 /* Specify the machine mode that pointers have.
2381 After generation of rtl, the compiler makes no further distinction
2382 between pointers and any other objects of this machine mode. */
2383 #define Pmode (TARGET_64BIT ? DImode : SImode)
2385 /* A function address in a call instruction
2386 is a byte address (for indexing purposes)
2387 so give the MEM rtx a byte's mode. */
2388 #define FUNCTION_MODE QImode
2390 /* A part of a C `switch' statement that describes the relative costs
2391 of constant RTL expressions. It must contain `case' labels for
2392 expression codes `const_int', `const', `symbol_ref', `label_ref'
2393 and `const_double'. Each case must ultimately reach a `return'
2394 statement to return the relative cost of the use of that kind of
2395 constant value in an expression. The cost may depend on the
2396 precise value of the constant, which is available for examination
2397 in X, and the rtx code of the expression in which it is contained,
2398 found in OUTER_CODE.
2400 CODE is the expression code--redundant, since it can be obtained
2401 with `GET_CODE (X)'. */
2403 #define CONST_COSTS(RTX, CODE, OUTER_CODE) \
2408 if (TARGET_64BIT && !x86_64_sign_extended_value (RTX)) \
2410 if (TARGET_64BIT && !x86_64_zero_extended_value (RTX)) \
2412 return flag_pic && SYMBOLIC_CONST (RTX) ? 1 : 0; \
2414 case CONST_DOUBLE: \
2417 if (GET_MODE (RTX) == VOIDmode) \
2420 code = standard_80387_constant_p (RTX); \
2421 return code == 1 ? 1 : \
2426 /* Delete the definition here when TOPLEVEL_COSTS_N_INSNS gets added to cse.c */
2427 #define TOPLEVEL_COSTS_N_INSNS(N) \
2428 do { total = COSTS_N_INSNS (N); goto egress_rtx_costs; } while (0)
2430 /* Like `CONST_COSTS' but applies to nonconstant RTL expressions.
2431 This can be used, for example, to indicate how costly a multiply
2432 instruction is. In writing this macro, you can use the construct
2433 `COSTS_N_INSNS (N)' to specify a cost equal to N fast
2434 instructions. OUTER_CODE is the code of the expression in which X
2437 This macro is optional; do not define it if the default cost
2438 assumptions are adequate for the target machine. */
2440 #define RTX_COSTS(X, CODE, OUTER_CODE) \
2442 /* The zero extensions is often completely free on x86_64, so make \
2443 it as cheap as possible. */ \
2444 if (TARGET_64BIT && GET_MODE (X) == DImode \
2445 && GET_MODE (XEXP (X, 0)) == SImode) \
2447 total = 1; goto egress_rtx_costs; \
2450 TOPLEVEL_COSTS_N_INSNS (TARGET_ZERO_EXTEND_WITH_AND ? \
2451 ix86_cost->add : ix86_cost->movzx); \
2454 TOPLEVEL_COSTS_N_INSNS (ix86_cost->movsx); \
2457 if (GET_CODE (XEXP (X, 1)) == CONST_INT \
2458 && (GET_MODE (XEXP (X, 0)) != DImode || TARGET_64BIT)) \
2460 HOST_WIDE_INT value = INTVAL (XEXP (X, 1)); \
2462 TOPLEVEL_COSTS_N_INSNS (ix86_cost->add); \
2463 if ((value == 2 || value == 3) \
2464 && !TARGET_DECOMPOSE_LEA \
2465 && ix86_cost->lea <= ix86_cost->shift_const) \
2466 TOPLEVEL_COSTS_N_INSNS (ix86_cost->lea); \
2468 /* fall through */ \
2474 if (!TARGET_64BIT && GET_MODE (XEXP (X, 0)) == DImode) \
2476 if (GET_CODE (XEXP (X, 1)) == CONST_INT) \
2478 if (INTVAL (XEXP (X, 1)) > 32) \
2479 TOPLEVEL_COSTS_N_INSNS(ix86_cost->shift_const + 2); \
2481 TOPLEVEL_COSTS_N_INSNS(ix86_cost->shift_const * 2); \
2485 if (GET_CODE (XEXP (X, 1)) == AND) \
2486 TOPLEVEL_COSTS_N_INSNS(ix86_cost->shift_var * 2); \
2488 TOPLEVEL_COSTS_N_INSNS(ix86_cost->shift_var * 6 + 2); \
2493 if (GET_CODE (XEXP (X, 1)) == CONST_INT) \
2494 TOPLEVEL_COSTS_N_INSNS (ix86_cost->shift_const); \
2496 TOPLEVEL_COSTS_N_INSNS (ix86_cost->shift_var); \
2501 if (GET_CODE (XEXP (X, 1)) == CONST_INT) \
2503 unsigned HOST_WIDE_INT value = INTVAL (XEXP (X, 1)); \
2506 while (value != 0) \
2512 TOPLEVEL_COSTS_N_INSNS (ix86_cost->mult_init \
2513 + nbits * ix86_cost->mult_bit); \
2515 else /* This is arbitrary */ \
2516 TOPLEVEL_COSTS_N_INSNS (ix86_cost->mult_init \
2517 + 7 * ix86_cost->mult_bit); \
2523 TOPLEVEL_COSTS_N_INSNS (ix86_cost->divide); \
2526 if (!TARGET_DECOMPOSE_LEA \
2527 && INTEGRAL_MODE_P (GET_MODE (X)) \
2528 && GET_MODE_BITSIZE (GET_MODE (X)) <= GET_MODE_BITSIZE (Pmode)) \
2530 if (GET_CODE (XEXP (X, 0)) == PLUS \
2531 && GET_CODE (XEXP (XEXP (X, 0), 0)) == MULT \
2532 && GET_CODE (XEXP (XEXP (XEXP (X, 0), 0), 1)) == CONST_INT \
2533 && CONSTANT_P (XEXP (X, 1))) \
2535 HOST_WIDE_INT val = INTVAL (XEXP (XEXP (XEXP (X, 0), 0), 1));\
2536 if (val == 2 || val == 4 || val == 8) \
2538 return (COSTS_N_INSNS (ix86_cost->lea) \
2539 + rtx_cost (XEXP (XEXP (X, 0), 1), \
2541 + rtx_cost (XEXP (XEXP (XEXP (X, 0), 0), 0), \
2543 + rtx_cost (XEXP (X, 1), (OUTER_CODE))); \
2546 else if (GET_CODE (XEXP (X, 0)) == MULT \
2547 && GET_CODE (XEXP (XEXP (X, 0), 1)) == CONST_INT) \
2549 HOST_WIDE_INT val = INTVAL (XEXP (XEXP (X, 0), 1)); \
2550 if (val == 2 || val == 4 || val == 8) \
2552 return (COSTS_N_INSNS (ix86_cost->lea) \
2553 + rtx_cost (XEXP (XEXP (X, 0), 0), \
2555 + rtx_cost (XEXP (X, 1), (OUTER_CODE))); \
2558 else if (GET_CODE (XEXP (X, 0)) == PLUS) \
2560 return (COSTS_N_INSNS (ix86_cost->lea) \
2561 + rtx_cost (XEXP (XEXP (X, 0), 0), (OUTER_CODE)) \
2562 + rtx_cost (XEXP (XEXP (X, 0), 1), (OUTER_CODE)) \
2563 + rtx_cost (XEXP (X, 1), (OUTER_CODE))); \
2567 /* fall through */ \
2572 if (!TARGET_64BIT && GET_MODE (X) == DImode) \
2573 return (COSTS_N_INSNS (ix86_cost->add) * 2 \
2574 + (rtx_cost (XEXP (X, 0), (OUTER_CODE)) \
2575 << (GET_MODE (XEXP (X, 0)) != DImode)) \
2576 + (rtx_cost (XEXP (X, 1), (OUTER_CODE)) \
2577 << (GET_MODE (XEXP (X, 1)) != DImode))); \
2579 /* fall through */ \
2582 if (!TARGET_64BIT && GET_MODE (X) == DImode) \
2583 TOPLEVEL_COSTS_N_INSNS (ix86_cost->add * 2); \
2584 TOPLEVEL_COSTS_N_INSNS (ix86_cost->add); \
2590 /* An expression giving the cost of an addressing mode that contains
2591 ADDRESS. If not defined, the cost is computed from the ADDRESS
2592 expression and the `CONST_COSTS' values.
2594 For most CISC machines, the default cost is a good approximation
2595 of the true cost of the addressing mode. However, on RISC
2596 machines, all instructions normally have the same length and
2597 execution time. Hence all addresses will have equal costs.
2599 In cases where more than one form of an address is known, the form
2600 with the lowest cost will be used. If multiple forms have the
2601 same, lowest, cost, the one that is the most complex will be used.
2603 For example, suppose an address that is equal to the sum of a
2604 register and a constant is used twice in the same basic block.
2605 When this macro is not defined, the address will be computed in a
2606 register and memory references will be indirect through that
2607 register. On machines where the cost of the addressing mode
2608 containing the sum is no higher than that of a simple indirect
2609 reference, this will produce an additional instruction and
2610 possibly require an additional register. Proper specification of
2611 this macro eliminates this overhead for such machines.
2613 Similar use of this macro is made in strength reduction of loops.
2615 ADDRESS need not be valid as an address. In such a case, the cost
2616 is not relevant and can be any value; invalid addresses need not be
2617 assigned a different cost.
2619 On machines where an address involving more than one register is as
2620 cheap as an address computation involving only one register,
2621 defining `ADDRESS_COST' to reflect this can cause two registers to
2622 be live over a region of code where only one would have been if
2623 `ADDRESS_COST' were not defined in that manner. This effect should
2624 be considered in the definition of this macro. Equivalent costs
2625 should probably only be given to addresses with different numbers
2626 of registers on machines with lots of registers.
2628 This macro will normally either not be defined or be defined as a
2631 For i386, it is better to use a complex address than let gcc copy
2632 the address into a reg and make a new pseudo. But not if the address
2633 requires to two regs - that would mean more pseudos with longer
2636 #define ADDRESS_COST(RTX) \
2637 ix86_address_cost (RTX)
2639 /* A C expression for the cost of moving data from a register in class FROM to
2640 one in class TO. The classes are expressed using the enumeration values
2641 such as `GENERAL_REGS'. A value of 2 is the default; other values are
2642 interpreted relative to that.
2644 It is not required that the cost always equal 2 when FROM is the same as TO;
2645 on some machines it is expensive to move between registers if they are not
2646 general registers. */
2648 #define REGISTER_MOVE_COST(MODE, CLASS1, CLASS2) \
2649 ix86_register_move_cost ((MODE), (CLASS1), (CLASS2))
2651 /* A C expression for the cost of moving data of mode M between a
2652 register and memory. A value of 2 is the default; this cost is
2653 relative to those in `REGISTER_MOVE_COST'.
2655 If moving between registers and memory is more expensive than
2656 between two registers, you should define this macro to express the
2659 #define MEMORY_MOVE_COST(MODE, CLASS, IN) \
2660 ix86_memory_move_cost ((MODE), (CLASS), (IN))
2662 /* A C expression for the cost of a branch instruction. A value of 1
2663 is the default; other values are interpreted relative to that. */
2665 #define BRANCH_COST ix86_branch_cost
2667 /* Define this macro as a C expression which is nonzero if accessing
2668 less than a word of memory (i.e. a `char' or a `short') is no
2669 faster than accessing a word of memory, i.e., if such access
2670 require more than one instruction or if there is no difference in
2671 cost between byte and (aligned) word loads.
2673 When this macro is not defined, the compiler will access a field by
2674 finding the smallest containing object; when it is defined, a
2675 fullword load will be used if alignment permits. Unless bytes
2676 accesses are faster than word accesses, using word accesses is
2677 preferable since it may eliminate subsequent memory access if
2678 subsequent accesses occur to other fields in the same word of the
2679 structure, but to different bytes. */
2681 #define SLOW_BYTE_ACCESS 0
2683 /* Nonzero if access to memory by shorts is slow and undesirable. */
2684 #define SLOW_SHORT_ACCESS 0
2686 /* Define this macro to be the value 1 if unaligned accesses have a
2687 cost many times greater than aligned accesses, for example if they
2688 are emulated in a trap handler.
2690 When this macro is non-zero, the compiler will act as if
2691 `STRICT_ALIGNMENT' were non-zero when generating code for block
2692 moves. This can cause significantly more instructions to be
2693 produced. Therefore, do not set this macro non-zero if unaligned
2694 accesses only add a cycle or two to the time for a memory access.
2696 If the value of this macro is always zero, it need not be defined. */
2698 /* #define SLOW_UNALIGNED_ACCESS(MODE, ALIGN) 0 */
2700 /* Define this macro to inhibit strength reduction of memory
2701 addresses. (On some machines, such strength reduction seems to do
2702 harm rather than good.) */
2704 /* #define DONT_REDUCE_ADDR */
2706 /* Define this macro if it is as good or better to call a constant
2707 function address than to call an address kept in a register.
2709 Desirable on the 386 because a CALL with a constant address is
2710 faster than one with a register address. */
2712 #define NO_FUNCTION_CSE
2714 /* Define this macro if it is as good or better for a function to call
2715 itself with an explicit address than to call an address kept in a
2718 #define NO_RECURSIVE_FUNCTION_CSE
2720 /* Add any extra modes needed to represent the condition code.
2722 For the i386, we need separate modes when floating-point
2723 equality comparisons are being done.
2725 Add CCNO to indicate comparisons against zero that requires
2726 Overflow flag to be unset. Sign bit test is used instead and
2727 thus can be used to form "a&b>0" type of tests.
2729 Add CCGC to indicate comparisons agains zero that allows
2730 unspecified garbage in the Carry flag. This mode is used
2731 by inc/dec instructions.
2733 Add CCGOC to indicate comparisons agains zero that allows
2734 unspecified garbage in the Carry and Overflow flag. This
2735 mode is used to simulate comparisons of (a-b) and (a+b)
2736 against zero using sub/cmp/add operations.
2738 Add CCZ to indicate that only the Zero flag is valid. */
2740 #define EXTRA_CC_MODES \
2741 CC (CCGCmode, "CCGC") \
2742 CC (CCGOCmode, "CCGOC") \
2743 CC (CCNOmode, "CCNO") \
2744 CC (CCZmode, "CCZ") \
2745 CC (CCFPmode, "CCFP") \
2746 CC (CCFPUmode, "CCFPU")
2748 /* Given a comparison code (EQ, NE, etc.) and the first operand of a COMPARE,
2749 return the mode to be used for the comparison.
2751 For floating-point equality comparisons, CCFPEQmode should be used.
2752 VOIDmode should be used in all other cases.
2754 For integer comparisons against zero, reduce to CCNOmode or CCZmode if
2755 possible, to allow for more combinations. */
2757 #define SELECT_CC_MODE(OP, X, Y) ix86_cc_mode ((OP), (X), (Y))
2759 /* Return non-zero if MODE implies a floating point inequality can be
2762 #define REVERSIBLE_CC_MODE(MODE) 1
2764 /* A C expression whose value is reversed condition code of the CODE for
2765 comparison done in CC_MODE mode. */
2766 #define REVERSE_CONDITION(CODE, MODE) \
2767 ((MODE) != CCFPmode && (MODE) != CCFPUmode ? reverse_condition (CODE) \
2768 : reverse_condition_maybe_unordered (CODE))
2771 /* Control the assembler format that we output, to the extent
2772 this does not vary between assemblers. */
2774 /* How to refer to registers in assembler output.
2775 This sequence is indexed by compiler's hard-register-number (see above). */
2777 /* In order to refer to the first 8 regs as 32 bit regs prefix an "e"
2778 For non floating point regs, the following are the HImode names.
2780 For float regs, the stack top is sometimes referred to as "%st(0)"
2781 instead of just "%st". PRINT_REG handles this with the "y" code. */
2783 #undef HI_REGISTER_NAMES
2784 #define HI_REGISTER_NAMES \
2785 {"ax","dx","cx","bx","si","di","bp","sp", \
2786 "st","st(1)","st(2)","st(3)","st(4)","st(5)","st(6)","st(7)","", \
2787 "flags","fpsr", "dirflag", "frame", \
2788 "xmm0","xmm1","xmm2","xmm3","xmm4","xmm5","xmm6","xmm7", \
2789 "mm0", "mm1", "mm2", "mm3", "mm4", "mm5", "mm6", "mm7" , \
2790 "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", \
2791 "xmm8", "xmm9", "xmm10", "xmm11", "xmm12", "xmm13", "xmm14", "xmm15"}
2793 #define REGISTER_NAMES HI_REGISTER_NAMES
2795 /* Table of additional register names to use in user input. */
2797 #define ADDITIONAL_REGISTER_NAMES \
2798 { { "eax", 0 }, { "edx", 1 }, { "ecx", 2 }, { "ebx", 3 }, \
2799 { "esi", 4 }, { "edi", 5 }, { "ebp", 6 }, { "esp", 7 }, \
2800 { "rax", 0 }, { "rdx", 1 }, { "rcx", 2 }, { "rbx", 3 }, \
2801 { "rsi", 4 }, { "rdi", 5 }, { "rbp", 6 }, { "rsp", 7 }, \
2802 { "al", 0 }, { "dl", 1 }, { "cl", 2 }, { "bl", 3 }, \
2803 { "ah", 0 }, { "dh", 1 }, { "ch", 2 }, { "bh", 3 }, \
2804 { "mm0", 8}, { "mm1", 9}, { "mm2", 10}, { "mm3", 11}, \
2805 { "mm4", 12}, { "mm5", 13}, { "mm6", 14}, { "mm7", 15} }
2807 /* Note we are omitting these since currently I don't know how
2808 to get gcc to use these, since they want the same but different
2809 number as al, and ax.
2812 #define QI_REGISTER_NAMES \
2813 {"al", "dl", "cl", "bl", "sil", "dil", "bpl", "spl",}
2815 /* These parallel the array above, and can be used to access bits 8:15
2816 of regs 0 through 3. */
2818 #define QI_HIGH_REGISTER_NAMES \
2819 {"ah", "dh", "ch", "bh", }
2821 /* How to renumber registers for dbx and gdb. */
2823 #define DBX_REGISTER_NUMBER(N) \
2824 (TARGET_64BIT ? dbx64_register_map[(N)] : dbx_register_map[(N)])
2826 extern int const dbx_register_map[FIRST_PSEUDO_REGISTER];
2827 extern int const dbx64_register_map[FIRST_PSEUDO_REGISTER];
2828 extern int const svr4_dbx_register_map[FIRST_PSEUDO_REGISTER];
2830 /* Before the prologue, RA is at 0(%esp). */
2831 #define INCOMING_RETURN_ADDR_RTX \
2832 gen_rtx_MEM (VOIDmode, gen_rtx_REG (VOIDmode, STACK_POINTER_REGNUM))
2834 /* After the prologue, RA is at -4(AP) in the current frame. */
2835 #define RETURN_ADDR_RTX(COUNT, FRAME) \
2837 ? gen_rtx_MEM (Pmode, plus_constant (arg_pointer_rtx, -UNITS_PER_WORD)) \
2838 : gen_rtx_MEM (Pmode, plus_constant (FRAME, UNITS_PER_WORD)))
2840 /* PC is dbx register 8; let's use that column for RA. */
2841 #define DWARF_FRAME_RETURN_COLUMN (TARGET_64BIT ? 16 : 8)
2843 /* Before the prologue, the top of the frame is at 4(%esp). */
2844 #define INCOMING_FRAME_SP_OFFSET UNITS_PER_WORD
2846 /* Describe how we implement __builtin_eh_return. */
2847 #define EH_RETURN_DATA_REGNO(N) ((N) < 2 ? (N) : INVALID_REGNUM)
2848 #define EH_RETURN_STACKADJ_RTX gen_rtx_REG (Pmode, 2)
2851 /* Select a format to encode pointers in exception handling data. CODE
2852 is 0 for data, 1 for code labels, 2 for function pointers. GLOBAL is
2853 true if the symbol may be affected by dynamic relocations.
2855 ??? All x86 object file formats are capable of representing this.
2856 After all, the relocation needed is the same as for the call insn.
2857 Whether or not a particular assembler allows us to enter such, I
2858 guess we'll have to see. */
2859 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL) \
2861 ? ((GLOBAL) ? DW_EH_PE_indirect : 0) | DW_EH_PE_pcrel | DW_EH_PE_sdata4\
2864 /* This is how to output the definition of a user-level label named NAME,
2865 such as the label on a static function or variable NAME. */
2867 #define ASM_OUTPUT_LABEL(FILE, NAME) \
2868 (assemble_name ((FILE), (NAME)), fputs (":\n", (FILE)))
2870 /* Store in OUTPUT a string (made with alloca) containing
2871 an assembler-name for a local static variable named NAME.
2872 LABELNO is an integer which is different for each call. */
2874 #define ASM_FORMAT_PRIVATE_NAME(OUTPUT, NAME, LABELNO) \
2875 ( (OUTPUT) = (char *) alloca (strlen ((NAME)) + 10), \
2876 sprintf ((OUTPUT), "%s.%d", (NAME), (LABELNO)))
2878 /* This is how to output an insn to push a register on the stack.
2879 It need not be very fast code. */
2881 #define ASM_OUTPUT_REG_PUSH(FILE, REGNO) \
2882 asm_fprintf ((FILE), "\tpush{l}\t%%e%s\n", reg_names[(REGNO)])
2884 /* This is how to output an insn to pop a register from the stack.
2885 It need not be very fast code. */
2887 #define ASM_OUTPUT_REG_POP(FILE, REGNO) \
2888 asm_fprintf ((FILE), "\tpop{l}\t%%e%s\n", reg_names[(REGNO)])
2890 /* This is how to output an element of a case-vector that is absolute. */
2892 #define ASM_OUTPUT_ADDR_VEC_ELT(FILE, VALUE) \
2893 ix86_output_addr_vec_elt ((FILE), (VALUE))
2895 /* This is how to output an element of a case-vector that is relative. */
2897 #define ASM_OUTPUT_ADDR_DIFF_ELT(FILE, BODY, VALUE, REL) \
2898 ix86_output_addr_diff_elt ((FILE), (VALUE), (REL))
2900 /* Under some conditions we need jump tables in the text section, because
2901 the assembler cannot handle label differences between sections. */
2903 #define JUMP_TABLES_IN_TEXT_SECTION \
2904 (!TARGET_64BIT && flag_pic && !HAVE_AS_GOTOFF_IN_DATA)
2906 /* A C statement that outputs an address constant appropriate to
2907 for DWARF debugging. */
2909 #define ASM_OUTPUT_DWARF_ADDR_CONST(FILE, X) \
2910 i386_dwarf_output_addr_const ((FILE), (X))
2912 /* Either simplify a location expression, or return the original. */
2914 #define ASM_SIMPLIFY_DWARF_ADDR(X) \
2915 i386_simplify_dwarf_addr (X)
2917 /* Switch to init or fini section via SECTION_OP, emit a call to FUNC,
2918 and switch back. For x86 we do this only to save a few bytes that
2919 would otherwise be unused in the text section. */
2920 #define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC) \
2921 asm (SECTION_OP "\n\t" \
2922 "call " USER_LABEL_PREFIX #FUNC "\n" \
2923 TEXT_SECTION_ASM_OP);
2925 /* Print operand X (an rtx) in assembler syntax to file FILE.
2926 CODE is a letter or dot (`z' in `%z0') or 0 if no letter was specified.
2927 Effect of various CODE letters is described in i386.c near
2928 print_operand function. */
2930 #define PRINT_OPERAND_PUNCT_VALID_P(CODE) \
2931 ((CODE) == '*' || (CODE) == '+')
2933 /* Print the name of a register based on its machine mode and number.
2934 If CODE is 'w', pretend the mode is HImode.
2935 If CODE is 'b', pretend the mode is QImode.
2936 If CODE is 'k', pretend the mode is SImode.
2937 If CODE is 'q', pretend the mode is DImode.
2938 If CODE is 'h', pretend the reg is the `high' byte register.
2939 If CODE is 'y', print "st(0)" instead of "st", if the reg is stack op. */
2941 #define PRINT_REG(X, CODE, FILE) \
2942 print_reg ((X), (CODE), (FILE))
2944 #define PRINT_OPERAND(FILE, X, CODE) \
2945 print_operand ((FILE), (X), (CODE))
2947 #define PRINT_OPERAND_ADDRESS(FILE, ADDR) \
2948 print_operand_address ((FILE), (ADDR))
2950 /* Print the name of a register for based on its machine mode and number.
2951 This macro is used to print debugging output.
2952 This macro is different from PRINT_REG in that it may be used in
2953 programs that are not linked with aux-output.o. */
2955 #define DEBUG_PRINT_REG(X, CODE, FILE) \
2956 do { static const char * const hi_name[] = HI_REGISTER_NAMES; \
2957 static const char * const qi_name[] = QI_REGISTER_NAMES; \
2958 fprintf ((FILE), "%d ", REGNO (X)); \
2959 if (REGNO (X) == FLAGS_REG) \
2960 { fputs ("flags", (FILE)); break; } \
2961 if (REGNO (X) == DIRFLAG_REG) \
2962 { fputs ("dirflag", (FILE)); break; } \
2963 if (REGNO (X) == FPSR_REG) \
2964 { fputs ("fpsr", (FILE)); break; } \
2965 if (REGNO (X) == ARG_POINTER_REGNUM) \
2966 { fputs ("argp", (FILE)); break; } \
2967 if (REGNO (X) == FRAME_POINTER_REGNUM) \
2968 { fputs ("frame", (FILE)); break; } \
2969 if (STACK_TOP_P (X)) \
2970 { fputs ("st(0)", (FILE)); break; } \
2972 { fputs (hi_name[REGNO(X)], (FILE)); break; } \
2973 if (REX_INT_REG_P (X)) \
2975 switch (GET_MODE_SIZE (GET_MODE (X))) \
2979 fprintf ((FILE), "r%i", REGNO (X) \
2980 - FIRST_REX_INT_REG + 8); \
2983 fprintf ((FILE), "r%id", REGNO (X) \
2984 - FIRST_REX_INT_REG + 8); \
2987 fprintf ((FILE), "r%iw", REGNO (X) \
2988 - FIRST_REX_INT_REG + 8); \
2991 fprintf ((FILE), "r%ib", REGNO (X) \
2992 - FIRST_REX_INT_REG + 8); \
2997 switch (GET_MODE_SIZE (GET_MODE (X))) \
3000 fputs ("r", (FILE)); \
3001 fputs (hi_name[REGNO (X)], (FILE)); \
3004 fputs ("e", (FILE)); \
3006 fputs (hi_name[REGNO (X)], (FILE)); \
3009 fputs (qi_name[REGNO (X)], (FILE)); \
3014 /* a letter which is not needed by the normal asm syntax, which
3015 we can use for operand syntax in the extended asm */
3017 #define ASM_OPERAND_LETTER '#'
3018 #define RET return ""
3019 #define AT_SP(MODE) (gen_rtx_MEM ((MODE), stack_pointer_rtx))
3021 /* Define the codes that are matched by predicates in i386.c. */
3023 #define PREDICATE_CODES \
3024 {"x86_64_immediate_operand", {CONST_INT, SUBREG, REG, \
3025 SYMBOL_REF, LABEL_REF, CONST}}, \
3026 {"x86_64_nonmemory_operand", {CONST_INT, SUBREG, REG, \
3027 SYMBOL_REF, LABEL_REF, CONST}}, \
3028 {"x86_64_movabs_operand", {CONST_INT, SUBREG, REG, \
3029 SYMBOL_REF, LABEL_REF, CONST}}, \
3030 {"x86_64_szext_nonmemory_operand", {CONST_INT, SUBREG, REG, \
3031 SYMBOL_REF, LABEL_REF, CONST}}, \
3032 {"x86_64_general_operand", {CONST_INT, SUBREG, REG, MEM, \
3033 SYMBOL_REF, LABEL_REF, CONST}}, \
3034 {"x86_64_szext_general_operand", {CONST_INT, SUBREG, REG, MEM, \
3035 SYMBOL_REF, LABEL_REF, CONST}}, \
3036 {"x86_64_zext_immediate_operand", {CONST_INT, CONST_DOUBLE, CONST, \
3037 SYMBOL_REF, LABEL_REF}}, \
3038 {"shiftdi_operand", {SUBREG, REG, MEM}}, \
3039 {"const_int_1_operand", {CONST_INT}}, \
3040 {"symbolic_operand", {SYMBOL_REF, LABEL_REF, CONST}}, \
3041 {"aligned_operand", {CONST_INT, CONST_DOUBLE, CONST, SYMBOL_REF, \
3042 LABEL_REF, SUBREG, REG, MEM}}, \
3043 {"pic_symbolic_operand", {CONST}}, \
3044 {"call_insn_operand", {REG, SUBREG, MEM, SYMBOL_REF}}, \
3045 {"constant_call_address_operand", {SYMBOL_REF, CONST}}, \
3046 {"const0_operand", {CONST_INT, CONST_DOUBLE}}, \
3047 {"const1_operand", {CONST_INT}}, \
3048 {"const248_operand", {CONST_INT}}, \
3049 {"incdec_operand", {CONST_INT}}, \
3050 {"mmx_reg_operand", {REG}}, \
3051 {"reg_no_sp_operand", {SUBREG, REG}}, \
3052 {"general_no_elim_operand", {CONST_INT, CONST_DOUBLE, CONST, \
3053 SYMBOL_REF, LABEL_REF, SUBREG, REG, MEM}}, \
3054 {"nonmemory_no_elim_operand", {CONST_INT, REG, SUBREG}}, \
3055 {"q_regs_operand", {SUBREG, REG}}, \
3056 {"non_q_regs_operand", {SUBREG, REG}}, \
3057 {"fcmov_comparison_operator", {EQ, NE, LTU, GTU, LEU, GEU, UNORDERED, \
3058 ORDERED, LT, UNLT, GT, UNGT, LE, UNLE, \
3059 GE, UNGE, LTGT, UNEQ}}, \
3060 {"sse_comparison_operator", {EQ, LT, LE, UNORDERED, NE, UNGE, UNGT, \
3061 ORDERED, UNEQ, UNLT, UNLE, LTGT, GE, GT \
3063 {"ix86_comparison_operator", {EQ, NE, LE, LT, GE, GT, LEU, LTU, GEU, \
3064 GTU, UNORDERED, ORDERED, UNLE, UNLT, \
3065 UNGE, UNGT, LTGT, UNEQ }}, \
3066 {"cmp_fp_expander_operand", {CONST_DOUBLE, SUBREG, REG, MEM}}, \
3067 {"ext_register_operand", {SUBREG, REG}}, \
3068 {"binary_fp_operator", {PLUS, MINUS, MULT, DIV}}, \
3069 {"mult_operator", {MULT}}, \
3070 {"div_operator", {DIV}}, \
3071 {"arith_or_logical_operator", {PLUS, MULT, AND, IOR, XOR, SMIN, SMAX, \
3072 UMIN, UMAX, COMPARE, MINUS, DIV, MOD, \
3073 UDIV, UMOD, ASHIFT, ROTATE, ASHIFTRT, \
3074 LSHIFTRT, ROTATERT}}, \
3075 {"promotable_binary_operator", {PLUS, MULT, AND, IOR, XOR, ASHIFT}}, \
3076 {"memory_displacement_operand", {MEM}}, \
3077 {"cmpsi_operand", {CONST_INT, CONST_DOUBLE, CONST, SYMBOL_REF, \
3078 LABEL_REF, SUBREG, REG, MEM, AND}}, \
3079 {"long_memory_operand", {MEM}},
3081 /* A list of predicates that do special things with modes, and so
3082 should not elicit warnings for VOIDmode match_operand. */
3084 #define SPECIAL_MODE_PREDICATES \
3085 "ext_register_operand",
3087 /* CM_32 is used by 32bit ABI
3088 CM_SMALL is small model assuming that all code and data fits in the first
3089 31bits of address space.
3090 CM_KERNEL is model assuming that all code and data fits in the negative
3091 31bits of address space.
3092 CM_MEDIUM is model assuming that code fits in the first 31bits of address
3093 space. Size of data is unlimited.
3094 CM_LARGE is model making no assumptions about size of particular sections.
3096 CM_SMALL_PIC is model for PIC libraries assuming that code+data+got/plt
3097 tables first in 31bits of address space.
3108 /* Size of the RED_ZONE area. */
3109 #define RED_ZONE_SIZE 128
3110 /* Reserved area of the red zone for temporaries. */
3111 #define RED_ZONE_RESERVE 8
3112 extern const char *ix86_debug_arg_string, *ix86_debug_addr_string;
3118 extern const char *ix86_asm_string;
3119 extern enum asm_dialect ix86_asm_dialect;
3120 /* Value of -mcmodel specified by user. */
3121 extern const char *ix86_cmodel_string;
3122 extern enum cmodel ix86_cmodel;
3124 /* Variables in i386.c */
3125 extern const char *ix86_cpu_string; /* for -mcpu=<xxx> */
3126 extern const char *ix86_arch_string; /* for -march=<xxx> */
3127 extern const char *ix86_fpmath_string; /* for -mfpmath=<xxx> */
3128 extern const char *ix86_regparm_string; /* # registers to use to pass args */
3129 extern const char *ix86_align_loops_string; /* power of two alignment for loops */
3130 extern const char *ix86_align_jumps_string; /* power of two alignment for non-loop jumps */
3131 extern const char *ix86_align_funcs_string; /* power of two alignment for functions */
3132 extern const char *ix86_preferred_stack_boundary_string;/* power of two alignment for stack boundary */
3133 extern const char *ix86_branch_cost_string; /* values 1-5: see jump.c */
3134 extern int ix86_regparm; /* ix86_regparm_string as a number */
3135 extern int ix86_preferred_stack_boundary; /* preferred stack boundary alignment in bits */
3136 extern int ix86_branch_cost; /* values 1-5: see jump.c */
3137 extern enum reg_class const regclass_map[FIRST_PSEUDO_REGISTER]; /* smalled class containing REGNO */
3138 extern rtx ix86_compare_op0; /* operand 0 for comparisons */
3139 extern rtx ix86_compare_op1; /* operand 1 for comparisons */
3141 /* To properly truncate FP values into integers, we need to set i387 control
3142 word. We can't emit proper mode switching code before reload, as spills
3143 generated by reload may truncate values incorrectly, but we still can avoid
3144 redundant computation of new control word by the mode switching pass.
3145 The fldcw instructions are still emitted redundantly, but this is probably
3146 not going to be noticeable problem, as most CPUs do have fast path for
3149 The machinery is to emit simple truncation instructions and split them
3150 before reload to instructions having USEs of two memory locations that
3151 are filled by this code to old and new control word.
3153 Post-reload pass may be later used to eliminate the redundant fildcw if
3156 enum fp_cw_mode {FP_CW_STORED, FP_CW_UNINITIALIZED, FP_CW_ANY};
3158 /* Define this macro if the port needs extra instructions inserted
3159 for mode switching in an optimizing compilation. */
3161 #define OPTIMIZE_MODE_SWITCHING(ENTITY) 1
3163 /* If you define `OPTIMIZE_MODE_SWITCHING', you have to define this as
3164 initializer for an array of integers. Each initializer element N
3165 refers to an entity that needs mode switching, and specifies the
3166 number of different modes that might need to be set for this
3167 entity. The position of the initializer in the initializer -
3168 starting counting at zero - determines the integer that is used to
3169 refer to the mode-switched entity in question. */
3171 #define NUM_MODES_FOR_MODE_SWITCHING { FP_CW_ANY }
3173 /* ENTITY is an integer specifying a mode-switched entity. If
3174 `OPTIMIZE_MODE_SWITCHING' is defined, you must define this macro to
3175 return an integer value not larger than the corresponding element
3176 in `NUM_MODES_FOR_MODE_SWITCHING', to denote the mode that ENTITY
3177 must be switched into prior to the execution of INSN. */
3179 #define MODE_NEEDED(ENTITY, I) \
3180 (GET_CODE (I) == CALL_INSN \
3181 || (GET_CODE (I) == INSN && (asm_noperands (PATTERN (I)) >= 0 \
3182 || GET_CODE (PATTERN (I)) == ASM_INPUT))\
3183 ? FP_CW_UNINITIALIZED \
3184 : recog_memoized (I) < 0 || get_attr_type (I) != TYPE_FISTP \
3188 /* This macro specifies the order in which modes for ENTITY are
3189 processed. 0 is the highest priority. */
3191 #define MODE_PRIORITY_TO_MODE(ENTITY, N) (N)
3193 /* Generate one or more insns to set ENTITY to MODE. HARD_REG_LIVE
3194 is the set of hard registers live at the point where the insn(s)
3195 are to be inserted. */
3197 #define EMIT_MODE_SET(ENTITY, MODE, HARD_REGS_LIVE) \
3198 ((MODE) == FP_CW_STORED \
3199 ? emit_i387_cw_initialization (assign_386_stack_local (HImode, 1), \
3200 assign_386_stack_local (HImode, 2)), 0\
3203 /* Avoid renaming of stack registers, as doing so in combination with
3204 scheduling just increases amount of live registers at time and in
3205 the turn amount of fxch instructions needed.
3207 ??? Maybe Pentium chips benefits from renaming, someone can try... */
3209 #define HARD_REGNO_RENAME_OK(SRC, TARGET) \
3210 ((SRC) < FIRST_STACK_REG || (SRC) > LAST_STACK_REG)
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