1 /* Subroutines for the gcc driver.
2 Copyright (C) 2006, 2007, 2008 Free Software Foundation, Inc.
4 This file is part of GCC.
6 GCC is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3, or (at your option)
11 GCC is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>. */
22 #include "coretypes.h"
26 const char *host_detect_local_cpu (int argc, const char **argv);
38 /* Returns command line parameters that describe size and
39 cache line size of the processor caches. */
42 describe_cache (struct cache_desc level1, struct cache_desc level2)
44 char size[100], line[100], size2[100];
46 /* At the moment, gcc does not use the information
47 about the associativity of the cache. */
49 snprintf (size, sizeof (size),
50 "--param l1-cache-size=%u ", level1.sizekb);
51 snprintf (line, sizeof (line),
52 "--param l1-cache-line-size=%u ", level1.line);
54 snprintf (size2, sizeof (size2),
55 "--param l2-cache-size=%u ", level2.sizekb);
57 return concat (size, line, size2, NULL);
60 /* Detect L2 cache parameters using CPUID extended function 0x80000006. */
63 detect_l2_cache (struct cache_desc *level2)
65 unsigned eax, ebx, ecx, edx;
68 __cpuid (0x80000006, eax, ebx, ecx, edx);
70 level2->sizekb = (ecx >> 16) & 0xffff;
71 level2->line = ecx & 0xff;
73 assoc = (ecx >> 12) & 0xf;
78 else if (assoc >= 0xa && assoc <= 0xc)
79 assoc = 32 + (assoc - 0xa) * 16;
80 else if (assoc >= 0xd && assoc <= 0xe)
81 assoc = 96 + (assoc - 0xd) * 32;
83 level2->assoc = assoc;
86 /* Returns the description of caches for an AMD processor. */
89 detect_caches_amd (unsigned max_ext_level)
91 unsigned eax, ebx, ecx, edx;
93 struct cache_desc level1, level2 = {0, 0, 0};
95 if (max_ext_level < 0x80000005)
98 __cpuid (0x80000005, eax, ebx, ecx, edx);
100 level1.sizekb = (ecx >> 24) & 0xff;
101 level1.assoc = (ecx >> 16) & 0xff;
102 level1.line = ecx & 0xff;
104 if (max_ext_level >= 0x80000006)
105 detect_l2_cache (&level2);
107 return describe_cache (level1, level2);
110 /* Decodes the size, the associativity and the cache line size of
111 L1/L2 caches of an Intel processor. Values are based on
112 "Intel Processor Identification and the CPUID Instruction"
113 [Application Note 485], revision -032, December 2007. */
116 decode_caches_intel (unsigned reg, bool xeon_mp,
117 struct cache_desc *level1, struct cache_desc *level2)
121 for (i = 24; i >= 0; i -= 8)
122 switch ((reg >> i) & 0xff)
125 level1->sizekb = 8; level1->assoc = 2; level1->line = 32;
128 level1->sizekb = 16; level1->assoc = 4; level1->line = 32;
131 level1->sizekb = 32; level1->assoc = 8; level1->line = 64;
134 level2->sizekb = 128; level2->assoc = 4; level2->line = 64;
137 level2->sizekb = 192; level2->assoc = 6; level2->line = 64;
140 level2->sizekb = 128; level2->assoc = 2; level2->line = 64;
143 level2->sizekb = 256; level2->assoc = 4; level2->line = 64;
146 level2->sizekb = 384; level2->assoc = 6; level2->line = 64;
149 level2->sizekb = 512; level2->assoc = 4; level2->line = 64;
152 level2->sizekb = 128; level2->assoc = 4; level2->line = 32;
155 level2->sizekb = 256; level2->assoc = 4; level2->line = 32;
158 level2->sizekb = 512; level2->assoc = 4; level2->line = 32;
161 level2->sizekb = 1024; level2->assoc = 4; level2->line = 32;
164 level2->sizekb = 2048; level2->assoc = 4; level2->line = 32;
169 level2->sizekb = 4096; level2->assoc = 16; level2->line = 64;
172 level2->sizekb = 6144; level2->assoc = 24; level2->line = 64;
175 level1->sizekb = 16; level1->assoc = 8; level1->line = 64;
178 level1->sizekb = 8; level1->assoc = 4; level1->line = 64;
181 level1->sizekb = 16; level1->assoc = 4; level1->line = 64;
184 level1->sizekb = 32; level1->assoc = 4; level1->line = 64;
187 level2->sizekb = 1024; level2->assoc = 4; level2->line = 64;
190 level2->sizekb = 128; level2->assoc = 8; level2->line = 64;
193 level2->sizekb = 256; level2->assoc = 8; level2->line = 64;
196 level2->sizekb = 512; level2->assoc = 8; level2->line = 64;
199 level2->sizekb = 1024; level2->assoc = 8; level2->line = 64;
202 level2->sizekb = 2048; level2->assoc = 8; level2->line = 64;
205 level2->sizekb = 512; level2->assoc = 2; level2->line = 64;
208 level2->sizekb = 256; level2->assoc = 8; level2->line = 32;
211 level2->sizekb = 512; level2->assoc = 8; level2->line = 32;
214 level2->sizekb = 1024; level2->assoc = 8; level2->line = 32;
217 level2->sizekb = 2048; level2->assoc = 8; level2->line = 32;
220 level2->sizekb = 512; level2->assoc = 4; level2->line = 64;
223 level2->sizekb = 1024; level2->assoc = 8; level2->line = 64;
230 /* Detect cache parameters using CPUID function 2. */
233 detect_caches_cpuid2 (bool xeon_mp,
234 struct cache_desc *level1, struct cache_desc *level2)
239 __cpuid (2, regs[0], regs[1], regs[2], regs[3]);
241 nreps = regs[0] & 0x0f;
246 for (i = 0; i < 4; i++)
247 if (regs[i] && !((regs[i] >> 31) & 1))
248 decode_caches_intel (regs[i], xeon_mp, level1, level2);
251 __cpuid (2, regs[0], regs[1], regs[2], regs[3]);
255 /* Detect cache parameters using CPUID function 4. This
256 method doesn't require hardcoded tables. */
267 detect_caches_cpuid4 (struct cache_desc *level1, struct cache_desc *level2)
269 struct cache_desc *cache;
271 unsigned eax, ebx, ecx, edx;
274 for (count = 0;; count++)
276 __cpuid_count(4, count, eax, ebx, ecx, edx);
284 switch ((eax >> 5) & 0x07)
298 unsigned sets = ecx + 1;
299 unsigned part = ((ebx >> 12) & 0x03ff) + 1;
301 cache->assoc = ((ebx >> 22) & 0x03ff) + 1;
302 cache->line = (ebx & 0x0fff) + 1;
304 cache->sizekb = (cache->assoc * part
305 * cache->line * sets) / 1024;
314 /* Returns the description of caches for an Intel processor. */
317 detect_caches_intel (bool xeon_mp, unsigned max_level, unsigned max_ext_level)
319 struct cache_desc level1 = {0, 0, 0}, level2 = {0, 0, 0};
322 detect_caches_cpuid4 (&level1, &level2);
323 else if (max_level >= 2)
324 detect_caches_cpuid2 (xeon_mp, &level1, &level2);
328 if (level1.sizekb == 0)
331 /* Intel CPUs are equipped with AMD style L2 cache info. Try this
332 method if other methods fail to provide L2 cache parameters. */
333 if (level2.sizekb == 0 && max_ext_level >= 0x80000006)
334 detect_l2_cache (&level2);
336 return describe_cache (level1, level2);
339 enum vendor_signatures
341 SIG_INTEL = 0x756e6547 /* Genu */,
342 SIG_AMD = 0x68747541 /* Auth */
345 enum processor_signatures
347 SIG_GEODE = 0x646f6547 /* Geod */
350 /* This will be called by the spec parser in gcc.c when it sees
351 a %:local_cpu_detect(args) construct. Currently it will be called
352 with either "arch" or "tune" as argument depending on if -march=native
353 or -mtune=native is to be substituted.
355 It returns a string containing new command line parameters to be
356 put at the place of the above two options, depending on what CPU
357 this is executed. E.g. "-march=k8" on an AMD64 machine
360 ARGC and ARGV are set depending on the actual arguments given
363 const char *host_detect_local_cpu (int argc, const char **argv)
365 enum processor_type processor = PROCESSOR_I386;
366 const char *cpu = "i386";
368 const char *cache = "";
369 const char *options = "";
371 unsigned int eax, ebx, ecx, edx;
373 unsigned int max_level, ext_level;
376 unsigned int model, family;
378 unsigned int has_sse3, has_ssse3, has_cmpxchg16b;
379 unsigned int has_cmpxchg8b, has_cmov, has_mmx, has_sse, has_sse2;
381 /* Extended features */
382 unsigned int has_lahf_lm = 0, has_sse4a = 0;
383 unsigned int has_longmode = 0, has_3dnowp = 0, has_3dnow = 0;
384 unsigned int has_movbe = 0, has_sse4_1 = 0, has_sse4_2 = 0;
385 unsigned int has_popcnt = 0, has_aes = 0, has_avx = 0;
386 unsigned int has_pclmul = 0, has_abm = 0, has_lwp = 0;
393 arch = !strcmp (argv[0], "arch");
395 if (!arch && strcmp (argv[0], "tune"))
398 max_level = __get_cpuid_max (0, &vendor);
402 __cpuid (1, eax, ebx, ecx, edx);
404 model = (eax >> 4) & 0x0f;
405 family = (eax >> 8) & 0x0f;
406 if (vendor == SIG_INTEL)
408 unsigned int extended_model, extended_family;
410 extended_model = (eax >> 12) & 0xf0;
411 extended_family = (eax >> 20) & 0xff;
414 family += extended_family;
415 model += extended_model;
417 else if (family == 0x06)
418 model += extended_model;
421 has_sse3 = ecx & bit_SSE3;
422 has_ssse3 = ecx & bit_SSSE3;
423 has_sse4_1 = ecx & bit_SSE4_1;
424 has_sse4_2 = ecx & bit_SSE4_2;
425 has_avx = ecx & bit_AVX;
426 has_cmpxchg16b = ecx & bit_CMPXCHG16B;
427 has_movbe = ecx & bit_MOVBE;
428 has_popcnt = ecx & bit_POPCNT;
429 has_aes = ecx & bit_AES;
430 has_pclmul = ecx & bit_PCLMUL;
432 has_cmpxchg8b = edx & bit_CMPXCHG8B;
433 has_cmov = edx & bit_CMOV;
434 has_mmx = edx & bit_MMX;
435 has_sse = edx & bit_SSE;
436 has_sse2 = edx & bit_SSE2;
438 /* Check cpuid level of extended features. */
439 __cpuid (0x80000000, ext_level, ebx, ecx, edx);
441 if (ext_level > 0x80000000)
443 __cpuid (0x80000001, eax, ebx, ecx, edx);
445 has_lahf_lm = ecx & bit_LAHF_LM;
446 has_sse4a = ecx & bit_SSE4a;
447 has_abm = ecx & bit_ABM;
448 has_lwp = ecx & bit_LWP;
450 has_longmode = edx & bit_LM;
451 has_3dnowp = edx & bit_3DNOWP;
452 has_3dnow = edx & bit_3DNOW;
457 if (vendor == SIG_AMD)
458 cache = detect_caches_amd (ext_level);
459 else if (vendor == SIG_INTEL)
461 bool xeon_mp = (family == 15 && model == 6);
462 cache = detect_caches_intel (xeon_mp, max_level, ext_level);
466 if (vendor == SIG_AMD)
470 /* Detect geode processor by its processor signature. */
471 if (ext_level > 0x80000001)
472 __cpuid (0x80000002, name, ebx, ecx, edx);
476 if (name == SIG_GEODE)
477 processor = PROCESSOR_GEODE;
479 processor = PROCESSOR_AMDFAM10;
480 else if (has_sse2 || has_longmode)
481 processor = PROCESSOR_K8;
483 processor = PROCESSOR_ATHLON;
485 processor = PROCESSOR_K6;
487 processor = PROCESSOR_PENTIUM;
494 processor = PROCESSOR_I486;
497 processor = PROCESSOR_PENTIUM;
500 processor = PROCESSOR_PENTIUMPRO;
503 processor = PROCESSOR_PENTIUM4;
506 /* We have no idea. */
507 processor = PROCESSOR_GENERIC32;
519 case PROCESSOR_PENTIUM:
525 case PROCESSOR_PENTIUMPRO:
527 /* It is Core 2 or Atom. */
528 cpu = (model == 28) ? "atom" : "core2";
532 /* It is Core Duo. */
535 /* It is Pentium M. */
538 /* It is Pentium III. */
541 /* It is Pentium II. */
544 /* Default to Pentium Pro. */
548 /* For -mtune, we default to -mtune=generic. */
551 case PROCESSOR_PENTIUM4:
562 case PROCESSOR_GEODE:
566 if (arch && has_3dnow)
571 case PROCESSOR_ATHLON:
578 if (arch && has_sse3)
583 case PROCESSOR_AMDFAM10:
588 /* Use something reasonable. */
606 else if (has_cmpxchg8b)
616 options = concat (options, " -mcx16", NULL);
618 options = concat (options, " -msahf", NULL);
620 options = concat (options, " -mmovbe", NULL);
622 options = concat (options, " -maes", NULL);
624 options = concat (options, " -mpclmul", NULL);
626 options = concat (options, " -mpopcnt", NULL);
628 options = concat (options, " -mabm", NULL);
630 options = concat (options, " -mlwp", NULL);
633 options = concat (options, " -mavx", NULL);
635 options = concat (options, " -msse4.2", NULL);
637 options = concat (options, " -msse4.1", NULL);
641 return concat (cache, "-m", argv[0], "=", cpu, options, NULL);
645 /* If we aren't compiling with GCC then the driver will just ignore
646 -march and -mtune "native" target and will leave to the newly
647 built compiler to generate code for its default target. */
649 const char *host_detect_local_cpu (int argc ATTRIBUTE_UNUSED,
650 const char **argv ATTRIBUTE_UNUSED)
654 #endif /* __GNUC__ */