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https://github.com/FFmpeg/FFmpeg.git
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132 lines
4.0 KiB
C
132 lines
4.0 KiB
C
/* Cpu detection code, extracted from mmx.h ((c)1997-99 by H. Dietz
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and R. Fisher). Converted to C and improved by Fabrice Bellard */
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#include <stdlib.h>
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#include "../dsputil.h"
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#ifdef ARCH_X86_64
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# define REG_b "rbx"
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# define REG_S "rsi"
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#else
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# define REG_b "ebx"
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# define REG_S "esi"
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#endif
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/* ebx saving is necessary for PIC. gcc seems unable to see it alone */
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#define cpuid(index,eax,ebx,ecx,edx)\
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__asm __volatile\
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("mov %%"REG_b", %%"REG_S"\n\t"\
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"cpuid\n\t"\
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"xchg %%"REG_b", %%"REG_S\
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: "=a" (eax), "=S" (ebx),\
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"=c" (ecx), "=d" (edx)\
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: "0" (index));
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/* Function to test if multimedia instructions are supported... */
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int mm_support(void)
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{
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int rval = 0;
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int eax, ebx, ecx, edx;
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int max_std_level, max_ext_level, std_caps=0, ext_caps=0;
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long a, c;
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__asm__ __volatile__ (
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/* See if CPUID instruction is supported ... */
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/* ... Get copies of EFLAGS into eax and ecx */
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"pushf\n\t"
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"pop %0\n\t"
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"mov %0, %1\n\t"
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/* ... Toggle the ID bit in one copy and store */
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/* to the EFLAGS reg */
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"xor $0x200000, %0\n\t"
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"push %0\n\t"
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"popf\n\t"
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/* ... Get the (hopefully modified) EFLAGS */
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"pushf\n\t"
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"pop %0\n\t"
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: "=a" (a), "=c" (c)
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:
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: "cc"
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);
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if (a == c)
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return 0; /* CPUID not supported */
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cpuid(0, max_std_level, ebx, ecx, edx);
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if(max_std_level >= 1){
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cpuid(1, eax, ebx, ecx, std_caps);
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if (std_caps & (1<<23))
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rval |= MM_MMX;
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if (std_caps & (1<<25))
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rval |= MM_MMXEXT | MM_SSE;
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if (std_caps & (1<<26))
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rval |= MM_SSE2;
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}
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cpuid(0x80000000, max_ext_level, ebx, ecx, edx);
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if(max_ext_level >= 0x80000001){
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cpuid(0x80000001, eax, ebx, ecx, ext_caps);
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if (ext_caps & (1<<31))
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rval |= MM_3DNOW;
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if (ext_caps & (1<<30))
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rval |= MM_3DNOWEXT;
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if (ext_caps & (1<<23))
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rval |= MM_MMX;
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}
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cpuid(0, eax, ebx, ecx, edx);
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if ( ebx == 0x68747541 &&
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edx == 0x69746e65 &&
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ecx == 0x444d4163) {
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/* AMD */
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if(ext_caps & (1<<22))
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rval |= MM_MMXEXT;
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} else if (ebx == 0x746e6543 &&
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edx == 0x48727561 &&
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ecx == 0x736c7561) { /* "CentaurHauls" */
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/* VIA C3 */
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if(ext_caps & (1<<24))
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rval |= MM_MMXEXT;
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} else if (ebx == 0x69727943 &&
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edx == 0x736e4978 &&
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ecx == 0x64616574) {
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/* Cyrix Section */
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/* See if extended CPUID level 80000001 is supported */
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/* The value of CPUID/80000001 for the 6x86MX is undefined
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according to the Cyrix CPU Detection Guide (Preliminary
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Rev. 1.01 table 1), so we'll check the value of eax for
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CPUID/0 to see if standard CPUID level 2 is supported.
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According to the table, the only CPU which supports level
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2 is also the only one which supports extended CPUID levels.
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*/
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if (eax < 2)
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return rval;
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if (ext_caps & (1<<24))
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rval |= MM_MMXEXT;
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}
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#if 0
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av_log(NULL, AV_LOG_DEBUG, "%s%s%s%s%s%s\n",
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(rval&MM_MMX) ? "MMX ":"",
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(rval&MM_MMXEXT) ? "MMX2 ":"",
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(rval&MM_SSE) ? "SSE ":"",
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(rval&MM_SSE2) ? "SSE2 ":"",
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(rval&MM_3DNOW) ? "3DNow ":"",
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(rval&MM_3DNOWEXT) ? "3DNowExt ":"");
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#endif
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return rval;
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}
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#ifdef __TEST__
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int main ( void )
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{
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int mm_flags;
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mm_flags = mm_support();
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printf("mm_support = 0x%08X\n",mm_flags);
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return 0;
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}
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#endif
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