Remove CPUID availability check on AMD64 as it's architectural.
[libav.git] / libavcodec / x86 / cpuid.c
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1/*
2 * CPU detection code, extracted from mmx.h
3 * (c)1997-99 by H. Dietz and R. Fisher
4 * Converted to C and improved by Fabrice Bellard.
5 *
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6 * This file is part of FFmpeg.
7 *
8 * FFmpeg is free software; you can redistribute it and/or
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9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
b78e7197 11 * version 2.1 of the License, or (at your option) any later version.
04d7f601 12 *
b78e7197 13 * FFmpeg is distributed in the hope that it will be useful,
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14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
b78e7197 19 * License along with FFmpeg; if not, write to the Free Software
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20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
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22
23#include <stdlib.h>
245976da
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24#include "libavutil/x86_cpu.h"
25#include "libavcodec/dsputil.h"
de6d9b64 26
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27#undef printf
28
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29/* ebx saving is necessary for PIC. gcc seems unable to see it alone */
30#define cpuid(index,eax,ebx,ecx,edx)\
be449fca 31 __asm__ volatile\
bb270c08 32 ("mov %%"REG_b", %%"REG_S"\n\t"\
1d20b11a 33 "cpuid\n\t"\
053dea12 34 "xchg %%"REG_b", %%"REG_S\
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35 : "=a" (eax), "=S" (ebx),\
36 "=c" (ecx), "=d" (edx)\
c10e9f70 37 : "0" (index));
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38
39/* Function to test if multimedia instructions are supported... */
40int mm_support(void)
41{
e7ddb0cf 42 int rval = 0;
de6d9b64 43 int eax, ebx, ecx, edx;
e42a152b 44 int max_std_level, max_ext_level, std_caps=0, ext_caps=0;
115329f1 45
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46#if ARCH_X86_32
47 x86_reg a, c;
be449fca 48 __asm__ volatile (
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49 /* See if CPUID instruction is supported ... */
50 /* ... Get copies of EFLAGS into eax and ecx */
d05f808d 51 "pushfl\n\t"
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52 "pop %0\n\t"
53 "mov %0, %1\n\t"
115329f1 54
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55 /* ... Toggle the ID bit in one copy and store */
56 /* to the EFLAGS reg */
57 "xor $0x200000, %0\n\t"
58 "push %0\n\t"
d05f808d 59 "popfl\n\t"
115329f1 60
80465c7e 61 /* ... Get the (hopefully modified) EFLAGS */
d05f808d 62 "pushfl\n\t"
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63 "pop %0\n\t"
64 : "=a" (a), "=c" (c)
65 :
66 : "cc"
67 );
115329f1 68
8b4d077f 69 if (a == c)
de6d9b64 70 return 0; /* CPUID not supported */
d05f808d 71#endif
de6d9b64 72
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73 cpuid(0, max_std_level, ebx, ecx, edx);
74
75 if(max_std_level >= 1){
76 cpuid(1, eax, ebx, ecx, std_caps);
77 if (std_caps & (1<<23))
3d4e3e56 78 rval |= FF_MM_MMX;
115329f1 79 if (std_caps & (1<<25))
1435e4cc 80 rval |= FF_MM_MMXEXT
b250f9c6 81#if HAVE_SSE
1435e4cc 82 | FF_MM_SSE;
115329f1 83 if (std_caps & (1<<26))
3d4e3e56 84 rval |= FF_MM_SSE2;
392f6da8 85 if (ecx & 1)
3d4e3e56 86 rval |= FF_MM_SSE3;
5a5c770d 87 if (ecx & 0x00000200 )
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88 rval |= FF_MM_SSSE3
89#endif
90 ;
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91 }
92
93 cpuid(0x80000000, max_ext_level, ebx, ecx, edx);
94
95 if(max_ext_level >= 0x80000001){
96 cpuid(0x80000001, eax, ebx, ecx, ext_caps);
97 if (ext_caps & (1<<31))
3d4e3e56 98 rval |= FF_MM_3DNOW;
e42a152b 99 if (ext_caps & (1<<30))
3d4e3e56 100 rval |= FF_MM_3DNOWEXT;
e42a152b 101 if (ext_caps & (1<<23))
3d4e3e56 102 rval |= FF_MM_MMX;
392f6da8 103 if (ext_caps & (1<<22))
3d4e3e56 104 rval |= FF_MM_MMXEXT;
de6d9b64 105 }
392f6da8 106
e42a152b 107#if 0
5a5c770d 108 av_log(NULL, AV_LOG_DEBUG, "%s%s%s%s%s%s%s%s\n",
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109 (rval&FF_MM_MMX) ? "MMX ":"",
110 (rval&FF_MM_MMXEXT) ? "MMX2 ":"",
111 (rval&FF_MM_SSE) ? "SSE ":"",
112 (rval&FF_MM_SSE2) ? "SSE2 ":"",
113 (rval&FF_MM_SSE3) ? "SSE3 ":"",
114 (rval&FF_MM_SSSE3) ? "SSSE3 ":"",
115 (rval&FF_MM_3DNOW) ? "3DNow ":"",
116 (rval&FF_MM_3DNOWEXT) ? "3DNowExt ":"");
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117#endif
118 return rval;
de6d9b64 119}
c10e9f70 120
34933442 121#ifdef TEST
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122int main ( void )
123{
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124 int mm_flags;
125 mm_flags = mm_support();
126 printf("mm_support = 0x%08X\n",mm_flags);
127 return 0;
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128}
129#endif