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 sprintf (size, "--param l1-cache-size=%u", level1.sizekb);
50 sprintf (line, "--param l1-cache-line-size=%u", level1.line);
52 sprintf (size2, "--param l2-cache-size=%u", level2.sizekb);
54 return concat (size, " ", line, " ", size2, " ", NULL);
57 /* Detect L2 cache parameters using CPUID extended function 0x80000006. */
60 detect_l2_cache (struct cache_desc *level2)
62 unsigned eax, ebx, ecx, edx;
65 __cpuid (0x80000006, eax, ebx, ecx, edx);
67 level2->sizekb = (ecx >> 16) & 0xffff;
68 level2->line = ecx & 0xff;
70 assoc = (ecx >> 12) & 0xf;
75 else if (assoc >= 0xa && assoc <= 0xc)
76 assoc = 32 + (assoc - 0xa) * 16;
77 else if (assoc >= 0xd && assoc <= 0xe)
78 assoc = 96 + (assoc - 0xd) * 32;
80 level2->assoc = assoc;
83 /* Returns the description of caches for an AMD processor. */
86 detect_caches_amd (unsigned max_ext_level)
88 unsigned eax, ebx, ecx, edx;
90 struct cache_desc level1, level2 = {0, 0, 0};
92 if (max_ext_level < 0x80000005)
95 __cpuid (0x80000005, eax, ebx, ecx, edx);
97 level1.sizekb = (ecx >> 24) & 0xff;
98 level1.assoc = (ecx >> 16) & 0xff;
99 level1.line = ecx & 0xff;
101 if (max_ext_level >= 0x80000006)
102 detect_l2_cache (&level2);
104 return describe_cache (level1, level2);
107 /* Decodes the size, the associativity and the cache line size of
108 L1/L2 caches of an Intel processor. Values are based on
109 "Intel Processor Identification and the CPUID Instruction"
110 [Application Note 485], revision -032, December 2007. */
113 decode_caches_intel (unsigned reg, bool xeon_mp,
114 struct cache_desc *level1, struct cache_desc *level2)
118 for (i = 24; i >= 0; i -= 8)
119 switch ((reg >> i) & 0xff)
122 level1->sizekb = 8; level1->assoc = 2; level1->line = 32;
125 level1->sizekb = 16; level1->assoc = 4; level1->line = 32;
128 level1->sizekb = 32; level1->assoc = 8; level1->line = 64;
131 level2->sizekb = 128; level2->assoc = 4; level2->line = 64;
134 level2->sizekb = 192; level2->assoc = 6; level2->line = 64;
137 level2->sizekb = 128; level2->assoc = 2; level2->line = 64;
140 level2->sizekb = 256; level2->assoc = 4; level2->line = 64;
143 level2->sizekb = 384; level2->assoc = 6; level2->line = 64;
146 level2->sizekb = 512; level2->assoc = 4; level2->line = 64;
149 level2->sizekb = 128; level2->assoc = 4; level2->line = 32;
152 level2->sizekb = 256; level2->assoc = 4; level2->line = 32;
155 level2->sizekb = 512; level2->assoc = 4; level2->line = 32;
158 level2->sizekb = 1024; level2->assoc = 4; level2->line = 32;
161 level2->sizekb = 2048; level2->assoc = 4; level2->line = 32;
166 level2->sizekb = 4096; level2->assoc = 16; level2->line = 64;
169 level2->sizekb = 6144; level2->assoc = 24; level2->line = 64;
172 level1->sizekb = 16; level1->assoc = 8; level1->line = 64;
175 level1->sizekb = 8; level1->assoc = 4; level1->line = 64;
178 level1->sizekb = 16; level1->assoc = 4; level1->line = 64;
181 level1->sizekb = 32; level1->assoc = 4; level1->line = 64;
184 level2->sizekb = 1024; level2->assoc = 4; level2->line = 64;
187 level2->sizekb = 128; level2->assoc = 8; level2->line = 64;
190 level2->sizekb = 256; level2->assoc = 8; level2->line = 64;
193 level2->sizekb = 512; level2->assoc = 8; level2->line = 64;
196 level2->sizekb = 1024; level2->assoc = 8; level2->line = 64;
199 level2->sizekb = 2048; level2->assoc = 8; level2->line = 64;
202 level2->sizekb = 512; level2->assoc = 2; level2->line = 64;
205 level2->sizekb = 256; level2->assoc = 8; level2->line = 32;
208 level2->sizekb = 512; level2->assoc = 8; level2->line = 32;
211 level2->sizekb = 1024; level2->assoc = 8; level2->line = 32;
214 level2->sizekb = 2048; level2->assoc = 8; level2->line = 32;
217 level2->sizekb = 512; level2->assoc = 4; level2->line = 64;
220 level2->sizekb = 1024; level2->assoc = 8; level2->line = 64;
227 /* Detect cache parameters using CPUID function 2. */
230 detect_caches_cpuid2 (bool xeon_mp,
231 struct cache_desc *level1, struct cache_desc *level2)
236 __cpuid (2, regs[0], regs[1], regs[2], regs[3]);
238 nreps = regs[0] & 0x0f;
243 for (i = 0; i < 4; i++)
244 if (regs[i] && !((regs[i] >> 31) & 1))
245 decode_caches_intel (regs[i], xeon_mp, level1, level2);
248 __cpuid (2, regs[0], regs[1], regs[2], regs[3]);
252 /* Detect cache parameters using CPUID function 4. This
253 method doesn't require hardcoded tables. */
264 detect_caches_cpuid4 (struct cache_desc *level1, struct cache_desc *level2)
266 struct cache_desc *cache;
268 unsigned eax, ebx, ecx, edx;
271 for (count = 0;; count++)
273 __cpuid_count(4, count, eax, ebx, ecx, edx);
281 switch ((eax >> 5) & 0x07)
295 unsigned sets = ecx + 1;
296 unsigned part = ((ebx >> 12) & 0x03ff) + 1;
298 cache->assoc = ((ebx >> 22) & 0x03ff) + 1;
299 cache->line = (ebx & 0x0fff) + 1;
301 cache->sizekb = (cache->assoc * part
302 * cache->line * sets) / 1024;
311 /* Returns the description of caches for an Intel processor. */
314 detect_caches_intel (bool xeon_mp, unsigned max_level, unsigned max_ext_level)
316 struct cache_desc level1 = {0, 0, 0}, level2 = {0, 0, 0};
319 detect_caches_cpuid4 (&level1, &level2);
320 else if (max_level >= 2)
321 detect_caches_cpuid2 (xeon_mp, &level1, &level2);
325 if (level1.sizekb == 0)
328 /* Intel CPUs are equipped with AMD style L2 cache info. Try this
329 method if other methods fail to provide L2 cache parameters. */
330 if (level2.sizekb == 0 && max_ext_level >= 0x80000006)
331 detect_l2_cache (&level2);
333 return describe_cache (level1, level2);
336 enum vendor_signatures
338 SIG_INTEL = 0x756e6547 /* Genu */,
339 SIG_AMD = 0x68747541 /* Auth */,
340 SIG_GEODE = 0x646f6547 /* Geod */
343 /* This will be called by the spec parser in gcc.c when it sees
344 a %:local_cpu_detect(args) construct. Currently it will be called
345 with either "arch" or "tune" as argument depending on if -march=native
346 or -mtune=native is to be substituted.
348 It returns a string containing new command line parameters to be
349 put at the place of the above two options, depending on what CPU
350 this is executed. E.g. "-march=k8" on an AMD64 machine
353 ARGC and ARGV are set depending on the actual arguments given
356 const char *host_detect_local_cpu (int argc, const char **argv)
358 enum processor_type processor = PROCESSOR_I386;
359 const char *cpu = "i386";
361 const char *cache = "";
362 const char *options = "";
364 unsigned int eax, ebx, ecx, edx;
366 unsigned int max_level, ext_level;
369 unsigned int model, family;
371 unsigned int has_sse3, has_ssse3, has_cmpxchg16b;
372 unsigned int has_cmpxchg8b, has_cmov, has_mmx, has_sse, has_sse2;
374 /* Extended features */
375 unsigned int has_lahf_lm = 0, has_sse4a = 0;
376 unsigned int has_longmode = 0, has_3dnowp = 0, has_3dnow = 0;
383 arch = !strcmp (argv[0], "arch");
385 if (!arch && strcmp (argv[0], "tune"))
388 max_level = __get_cpuid_max (0, &vendor);
392 __cpuid (1, eax, ebx, ecx, edx);
394 /* We don't care for extended family. */
395 model = (eax >> 4) & 0x0f;
396 family = (eax >> 8) & 0x0f;
398 has_sse3 = ecx & bit_SSE3;
399 has_ssse3 = ecx & bit_SSSE3;
400 has_cmpxchg16b = ecx & bit_CMPXCHG16B;
402 has_cmpxchg8b = edx & bit_CMPXCHG8B;
403 has_cmov = edx & bit_CMOV;
404 has_mmx = edx & bit_MMX;
405 has_sse = edx & bit_SSE;
406 has_sse2 = edx & bit_SSE2;
408 /* Check cpuid level of extended features. */
409 __cpuid (0x80000000, ext_level, ebx, ecx, edx);
411 if (ext_level > 0x80000000)
413 __cpuid (0x80000001, eax, ebx, ecx, edx);
415 has_lahf_lm = ecx & bit_LAHF_LM;
416 has_sse4a = ecx & bit_SSE4a;
418 has_longmode = edx & bit_LM;
419 has_3dnowp = edx & bit_3DNOWP;
420 has_3dnow = edx & bit_3DNOW;
425 if (vendor == SIG_AMD)
426 cache = detect_caches_amd (ext_level);
427 else if (vendor == SIG_INTEL)
429 bool xeon_mp = (family == 15 && model == 6);
430 cache = detect_caches_intel (xeon_mp, max_level, ext_level);
434 if (vendor == SIG_AMD)
436 processor = PROCESSOR_PENTIUM;
439 processor = PROCESSOR_K6;
441 processor = PROCESSOR_ATHLON;
442 if (has_sse2 || has_longmode)
443 processor = PROCESSOR_K8;
445 processor = PROCESSOR_AMDFAM10;
447 else if (vendor == SIG_GEODE)
448 processor = PROCESSOR_GEODE;
454 processor = PROCESSOR_I486;
457 processor = PROCESSOR_PENTIUM;
460 processor = PROCESSOR_PENTIUMPRO;
463 processor = PROCESSOR_PENTIUM4;
466 /* We have no idea. */
467 processor = PROCESSOR_GENERIC32;
479 case PROCESSOR_PENTIUM:
485 case PROCESSOR_PENTIUMPRO:
487 /* It is Core 2 Duo. */
492 /* It is Core Duo. */
495 /* It is Pentium M. */
498 /* It is Pentium III. */
501 /* It is Pentium II. */
504 /* Default to Pentium Pro. */
508 /* For -mtune, we default to -mtune=generic. */
511 case PROCESSOR_PENTIUM4:
522 case PROCESSOR_GEODE:
526 if (arch && has_3dnow)
531 case PROCESSOR_ATHLON:
538 if (arch && has_sse3)
543 case PROCESSOR_AMDFAM10:
548 /* Use something reasonable. */
566 else if (has_cmpxchg8b)
576 options = concat (options, "-mcx16 ", NULL);
578 options = concat (options, "-msahf ", NULL);
582 return concat (cache, "-m", argv[0], "=", cpu, " ", options, NULL);
586 /* If we aren't compiling with GCC we just provide a minimal
589 const char *host_detect_local_cpu (int argc, const char **argv)
597 arch = !strcmp (argv[0], "arch");
599 if (!arch && strcmp (argv[0], "tune"))
604 /* FIXME: i386 is wrong for 64bit compiler. How can we tell if
605 we are generating 64bit or 32bit code? */
611 return concat ("-m", argv[0], "=", cpu, NULL);
613 #endif /* __GNUC__ */