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annotate libavcodec/x86/cpuid.c @ 3:0b056460c67d

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changed code to use VSs
author Nina Engelhardt <nengel@mailbox.tu-berlin.de>
date Mon, 29 Oct 2012 16:44:27 +0100
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nengel@2 1 /*
nengel@2 2 * CPU detection code, extracted from mmx.h
nengel@2 3 * (c)1997-99 by H. Dietz and R. Fisher
nengel@2 4 * Converted to C and improved by Fabrice Bellard.
nengel@2 5 *
nengel@2 6 * This file is part of FFmpeg.
nengel@2 7 *
nengel@2 8 * FFmpeg is free software; you can redistribute it and/or
nengel@2 9 * modify it under the terms of the GNU Lesser General Public
nengel@2 10 * License as published by the Free Software Foundation; either
nengel@2 11 * version 2.1 of the License, or (at your option) any later version.
nengel@2 12 *
nengel@2 13 * FFmpeg is distributed in the hope that it will be useful,
nengel@2 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
nengel@2 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
nengel@2 16 * Lesser General Public License for more details.
nengel@2 17 *
nengel@2 18 * You should have received a copy of the GNU Lesser General Public
nengel@2 19 * License along with FFmpeg; if not, write to the Free Software
nengel@2 20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
nengel@2 21 */
nengel@2 22
nengel@2 23 #include <stdlib.h>
nengel@2 24 #include "libavutil/x86_cpu.h"
nengel@2 25 #include "libavcodec/dsputil.h"
nengel@2 26
nengel@2 27 #undef printf
nengel@2 28
nengel@2 29 /* ebx saving is necessary for PIC. gcc seems unable to see it alone */
nengel@2 30 #define cpuid(index,eax,ebx,ecx,edx)\
nengel@2 31 __asm__ volatile\
nengel@2 32 ("mov %%"REG_b", %%"REG_S"\n\t"\
nengel@2 33 "cpuid\n\t"\
nengel@2 34 "xchg %%"REG_b", %%"REG_S\
nengel@2 35 : "=a" (eax), "=S" (ebx),\
nengel@2 36 "=c" (ecx), "=d" (edx)\
nengel@2 37 : "0" (index));
nengel@2 38
nengel@2 39 /* Function to test if multimedia instructions are supported... */
nengel@2 40 int mm_support()
nengel@2 41 {
nengel@2 42 int rval = 0;
nengel@2 43 int eax, ebx, ecx, edx;
nengel@2 44 int max_std_level, max_ext_level, std_caps=0, ext_caps=0;
nengel@2 45
nengel@2 46 #if ARCH_X86_32
nengel@2 47 x86_reg a, c;
nengel@2 48 __asm__ volatile (
nengel@2 49 /* See if CPUID instruction is supported ... */
nengel@2 50 /* ... Get copies of EFLAGS into eax and ecx */
nengel@2 51 "pushfl\n\t"
nengel@2 52 "pop %0\n\t"
nengel@2 53 "mov %0, %1\n\t"
nengel@2 54
nengel@2 55 /* ... Toggle the ID bit in one copy and store */
nengel@2 56 /* to the EFLAGS reg */
nengel@2 57 "xor $0x200000, %0\n\t"
nengel@2 58 "push %0\n\t"
nengel@2 59 "popfl\n\t"
nengel@2 60
nengel@2 61 /* ... Get the (hopefully modified) EFLAGS */
nengel@2 62 "pushfl\n\t"
nengel@2 63 "pop %0\n\t"
nengel@2 64 : "=a" (a), "=c" (c)
nengel@2 65 :
nengel@2 66 : "cc"
nengel@2 67 );
nengel@2 68
nengel@2 69 if (a == c)
nengel@2 70 return 0; /* CPUID not supported */
nengel@2 71 #endif
nengel@2 72
nengel@2 73 cpuid(0, max_std_level, ebx, ecx, edx);
nengel@2 74
nengel@2 75 if(max_std_level >= 1){
nengel@2 76 cpuid(1, eax, ebx, ecx, std_caps);
nengel@2 77 if (std_caps & (1<<23))
nengel@2 78 rval |= FF_MM_MMX;
nengel@2 79 if (std_caps & (1<<25))
nengel@2 80 rval |= FF_MM_MMX2
nengel@2 81 #if HAVE_SSE
nengel@2 82 | FF_MM_SSE;
nengel@2 83 if (std_caps & (1<<26))
nengel@2 84 rval |= FF_MM_SSE2;
nengel@2 85 if (ecx & 1)
nengel@2 86 rval |= FF_MM_SSE3;
nengel@2 87 if (ecx & 0x00000200 )
nengel@2 88 rval |= FF_MM_SSSE3;
nengel@2 89 if (ecx & 0x00080000 )
nengel@2 90 rval |= FF_MM_SSE4;
nengel@2 91 if (ecx & 0x00100000 )
nengel@2 92 rval |= FF_MM_SSE42;
nengel@2 93 #endif
nengel@2 94 ;
nengel@2 95 }
nengel@2 96
nengel@2 97 cpuid(0x80000000, max_ext_level, ebx, ecx, edx);
nengel@2 98
nengel@2 99 if(max_ext_level >= 0x80000001){
nengel@2 100 cpuid(0x80000001, eax, ebx, ecx, ext_caps);
nengel@2 101 if (ext_caps & (1<<31))
nengel@2 102 rval |= FF_MM_3DNOW;
nengel@2 103 if (ext_caps & (1<<30))
nengel@2 104 rval |= FF_MM_3DNOWEXT;
nengel@2 105 if (ext_caps & (1<<23))
nengel@2 106 rval |= FF_MM_MMX;
nengel@2 107 if (ext_caps & (1<<22))
nengel@2 108 rval |= FF_MM_MMX2;
nengel@2 109 }
nengel@2 110
nengel@2 111 #if 0
nengel@2 112 av_log(NULL, AV_LOG_DEBUG, "%s%s%s%s%s%s%s%s%s%s\n",
nengel@2 113 (rval&FF_MM_MMX) ? "MMX ":"",
nengel@2 114 (rval&FF_MM_MMX2) ? "MMX2 ":"",
nengel@2 115 (rval&FF_MM_SSE) ? "SSE ":"",
nengel@2 116 (rval&FF_MM_SSE2) ? "SSE2 ":"",
nengel@2 117 (rval&FF_MM_SSE3) ? "SSE3 ":"",
nengel@2 118 (rval&FF_MM_SSSE3) ? "SSSE3 ":"",
nengel@2 119 (rval&FF_MM_SSE4) ? "SSE4.1 ":"",
nengel@2 120 (rval&FF_MM_SSE42) ? "SSE4.2 ":"",
nengel@2 121 (rval&FF_MM_3DNOW) ? "3DNow ":"",
nengel@2 122 (rval&FF_MM_3DNOWEXT) ? "3DNowExt ":"");
nengel@2 123 #endif
nengel@2 124 return rval;
nengel@2 125 }
nengel@2 126
nengel@2 127 #ifdef TEST
nengel@2 128 int main ( void )
nengel@2 129 {
nengel@2 130 int mm_flags;
nengel@2 131 mm_flags = mm_support();
nengel@2 132 printf("mm_support = 0x%08X\n",mm_flags);
nengel@2 133 return 0;
nengel@2 134 }
nengel@2 135 #endif