308 lines
6.9 KiB
C
308 lines
6.9 KiB
C
/* Subroutines for the gcc driver.
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Copyright (C) 2006 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GCC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING. If not, write to
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the Free Software Foundation, 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA. */
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#include "config.h"
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#include "system.h"
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#include "coretypes.h"
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#include "tm.h"
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#include <stdlib.h>
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const char *host_detect_local_cpu (int argc, const char **argv);
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#ifdef GCC_VERSION
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#define cpuid(num,a,b,c,d) \
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asm volatile ("xchgl %%ebx, %1; cpuid; xchgl %%ebx, %1" \
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: "=a" (a), "=r" (b), "=c" (c), "=d" (d) \
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: "0" (num))
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#define bit_CMPXCHG8B (1 << 8)
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#define bit_CMOV (1 << 15)
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#define bit_MMX (1 << 23)
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#define bit_SSE (1 << 25)
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#define bit_SSE2 (1 << 26)
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#define bit_SSE3 (1 << 0)
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#define bit_SSSE3 (1 << 9)
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#define bit_CMPXCHG16B (1 << 13)
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#define bit_3DNOW (1 << 31)
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#define bit_3DNOWP (1 << 30)
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#define bit_LM (1 << 29)
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/* This will be called by the spec parser in gcc.c when it sees
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a %:local_cpu_detect(args) construct. Currently it will be called
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with either "arch" or "tune" as argument depending on if -march=native
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or -mtune=native is to be substituted.
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It returns a string containing new command line parameters to be
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put at the place of the above two options, depending on what CPU
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this is executed. E.g. "-march=k8" on an AMD64 machine
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for -march=native.
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ARGC and ARGV are set depending on the actual arguments given
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in the spec. */
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const char *host_detect_local_cpu (int argc, const char **argv)
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{
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const char *cpu = NULL;
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enum processor_type processor = PROCESSOR_I386;
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unsigned int eax, ebx, ecx, edx;
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unsigned int max_level;
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unsigned int vendor;
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unsigned int ext_level;
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unsigned char has_mmx = 0, has_3dnow = 0, has_3dnowp = 0, has_sse = 0;
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unsigned char has_sse2 = 0, has_sse3 = 0, has_ssse3 = 0, has_cmov = 0;
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unsigned char has_longmode = 0, has_cmpxchg8b = 0;
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unsigned char is_amd = 0;
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unsigned int family = 0;
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bool arch;
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if (argc < 1)
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return NULL;
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arch = strcmp (argv[0], "arch") == 0;
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if (!arch && strcmp (argv[0], "tune"))
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return NULL;
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#ifndef __x86_64__
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/* See if we can use cpuid. */
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asm volatile ("pushfl; pushfl; popl %0; movl %0,%1; xorl %2,%0;"
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"pushl %0; popfl; pushfl; popl %0; popfl"
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: "=&r" (eax), "=&r" (ebx)
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: "i" (0x00200000));
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if (((eax ^ ebx) & 0x00200000) == 0)
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goto done;
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#endif
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processor = PROCESSOR_PENTIUM;
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/* Check the highest input value for eax. */
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cpuid (0, eax, ebx, ecx, edx);
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max_level = eax;
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/* We only look at the first four characters. */
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vendor = ebx;
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if (max_level == 0)
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goto done;
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cpuid (1, eax, ebx, ecx, edx);
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has_cmpxchg8b = !!(edx & bit_CMPXCHG8B);
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has_cmov = !!(edx & bit_CMOV);
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has_mmx = !!(edx & bit_MMX);
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has_sse = !!(edx & bit_SSE);
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has_sse2 = !!(edx & bit_SSE2);
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has_sse3 = !!(ecx & bit_SSE3);
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has_ssse3 = !!(ecx & bit_SSSE3);
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/* We don't care for extended family. */
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family = (eax >> 8) & ~(1 << 4);
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cpuid (0x80000000, eax, ebx, ecx, edx);
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ext_level = eax;
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if (ext_level >= 0x80000000)
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{
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cpuid (0x80000001, eax, ebx, ecx, edx);
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has_3dnow = !!(edx & bit_3DNOW);
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has_3dnowp = !!(edx & bit_3DNOWP);
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has_longmode = !!(edx & bit_LM);
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}
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is_amd = vendor == *(unsigned int*)"Auth";
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if (is_amd)
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{
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if (has_mmx)
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processor = PROCESSOR_K6;
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if (has_3dnowp)
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processor = PROCESSOR_ATHLON;
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if (has_sse2 || has_longmode)
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processor = PROCESSOR_K8;
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}
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else
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{
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switch (family)
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{
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case 5:
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/* Default is PROCESSOR_PENTIUM. */
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break;
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case 6:
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processor = PROCESSOR_PENTIUMPRO;
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break;
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case 15:
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processor = PROCESSOR_PENTIUM4;
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break;
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default:
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/* We have no idea. Use something reasonable. */
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if (arch)
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{
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if (has_ssse3)
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cpu = "core2";
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else if (has_sse3)
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{
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if (has_longmode)
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cpu = "nocona";
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else
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cpu = "prescott";
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}
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else if (has_sse2)
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cpu = "pentium4";
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else if (has_cmov)
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cpu = "pentiumpro";
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else if (has_mmx)
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cpu = "pentium-mmx";
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else if (has_cmpxchg8b)
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cpu = "pentium";
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else
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cpu = "i386";
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}
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else
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cpu = "generic";
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goto done;
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break;
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}
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}
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switch (processor)
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{
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case PROCESSOR_I386:
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cpu = "i386";
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break;
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case PROCESSOR_I486:
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cpu = "i486";
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break;
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case PROCESSOR_PENTIUM:
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if (has_mmx)
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cpu = "pentium-mmx";
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else
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cpu = "pentium";
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break;
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case PROCESSOR_PENTIUMPRO:
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if (arch)
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{
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if (has_sse3)
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{
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if (has_longmode)
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{
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/* It is Core 2 Duo. */
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cpu = "nocona";
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}
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else
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{
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/* It is Core Duo. */
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cpu = "prescott";
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}
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}
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else if (has_sse2)
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{
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/* It is Pentium M. */
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cpu = "pentium4";
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}
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else if (has_sse)
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{
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/* It is Pentium III. */
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cpu = "pentium3";
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}
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else if (has_mmx)
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{
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/* It is Pentium II. */
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cpu = "pentium2";
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}
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else
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{
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/* Default to Pentium Pro. */
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cpu = "pentiumpro";
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}
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}
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else
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{
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/* For -mtune, we default to -mtune=generic. */
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cpu = "generic";
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}
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break;
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case PROCESSOR_GEODE:
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cpu = "geode";
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break;
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case PROCESSOR_K6:
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if (has_3dnow)
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cpu = "k6-3";
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else
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cpu = "k6";
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break;
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case PROCESSOR_ATHLON:
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if (has_sse)
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cpu = "athlon-4";
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else
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cpu = "athlon";
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break;
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case PROCESSOR_PENTIUM4:
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if (has_sse3)
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{
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if (has_longmode)
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cpu = "nocona";
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else
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cpu = "prescott";
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}
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else
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cpu = "pentium4";
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break;
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case PROCESSOR_K8:
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cpu = "k8";
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break;
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case PROCESSOR_NOCONA:
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cpu = "nocona";
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break;
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case PROCESSOR_GENERIC32:
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case PROCESSOR_GENERIC64:
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cpu = "generic";
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break;
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default:
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abort ();
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break;
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}
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done:
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return concat ("-m", argv[0], "=", cpu, NULL);
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}
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#else
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/* If we aren't compiling with GCC we just provide a minimal
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default value. */
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const char *host_detect_local_cpu (int argc, const char **argv)
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{
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const char *cpu;
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bool arch;
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if (argc < 1)
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return NULL;
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arch = strcmp (argv[0], "arch") == 0;
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if (!arch && strcmp (argv[0], "tune"))
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return NULL;
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if (arch)
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{
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/* FIXME: i386 is wrong for 64bit compiler. How can we tell if
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we are generating 64bit or 32bit code? */
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cpu = "i386";
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}
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else
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cpu = "generic";
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return concat ("-m", argv[0], "=", cpu, NULL);
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}
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#endif /* GCC_VERSION */
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