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fixed cpuid macro to allow PIC compiling

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Originally committed as revision 10 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Fabrice Bellard 2001-07-24 20:37:52 +00:00
parent d771bcae33
commit a9e3707d6b
1 changed files with 17 additions and 12 deletions

29
libavcodec/i386/cputest.c

@ -4,12 +4,18 @@
#include <stdlib.h> #include <stdlib.h>
#include "../dsputil.h" #include "../dsputil.h"
#define cpuid(index,eax,ebx,ecx,edx) \ /* ebx saving is necessary for PIC. gcc seems unable to see it alone */
asm ("cpuid" \ static inline void cpuid(int index, int *eax, int *ebx, int *ecx, int *edx)
: "=a" (eax), "=b" (ebx), \ {
"=c" (ecx), "=d" (edx) \ asm ("pushl %%ebx\n\t"
: "a" (index) \ "cpuid\n\t"
: "cc") "movl %%ebx, %1\n\t"
"popl %%ebx\n\t"
: "=a" (*eax), "=m" (*ebx),
"=c" (*ecx), "=d" (*edx)
: "a" (index)
: "cc");
}
/* Function to test if multimedia instructions are supported... */ /* Function to test if multimedia instructions are supported... */
int mm_support(void) int mm_support(void)
@ -17,7 +23,6 @@ int mm_support(void)
int rval; int rval;
int eax, ebx, ecx, edx; int eax, ebx, ecx, edx;
__asm__ __volatile__ ( __asm__ __volatile__ (
/* See if CPUID instruction is supported ... */ /* See if CPUID instruction is supported ... */
/* ... Get copies of EFLAGS into eax and ecx */ /* ... Get copies of EFLAGS into eax and ecx */
@ -42,7 +47,7 @@ int mm_support(void)
if (eax == ecx) if (eax == ecx)
return 0; /* CPUID not supported */ return 0; /* CPUID not supported */
cpuid(0, eax, ebx, ecx, edx); cpuid(0, &eax, &ebx, &ecx, &edx);
if (ebx == 0x756e6547 && if (ebx == 0x756e6547 &&
edx == 0x49656e69 && edx == 0x49656e69 &&
@ -50,7 +55,7 @@ int mm_support(void)
/* intel */ /* intel */
inteltest: inteltest:
cpuid(1, eax, ebx, ecx, edx); cpuid(1, &eax, &ebx, &ecx, &edx);
if ((edx & 0x00800000) == 0) if ((edx & 0x00800000) == 0)
return 0; return 0;
rval = MM_MMX; rval = MM_MMX;
@ -63,10 +68,10 @@ int mm_support(void)
edx == 0x69746e65 && edx == 0x69746e65 &&
ecx == 0x444d4163) { ecx == 0x444d4163) {
/* AMD */ /* AMD */
cpuid(0x80000000, eax, ebx, ecx, edx); cpuid(0x80000000, &eax, &ebx, &ecx, &edx);
if ((unsigned)eax < 0x80000001) if ((unsigned)eax < 0x80000001)
goto inteltest; goto inteltest;
cpuid(0x80000001, eax, ebx, ecx, edx); cpuid(0x80000001, &eax, &ebx, &ecx, &edx);
if ((edx & 0x00800000) == 0) if ((edx & 0x00800000) == 0)
return 0; return 0;
rval = MM_MMX; rval = MM_MMX;
@ -89,7 +94,7 @@ int mm_support(void)
*/ */
if (eax != 2) if (eax != 2)
goto inteltest; goto inteltest;
cpuid(0x80000001, eax, ebx, ecx, edx); cpuid(0x80000001, &eax, &ebx, &ecx, &edx);
if ((eax & 0x00800000) == 0) if ((eax & 0x00800000) == 0)
return 0; return 0;
rval = MM_MMX; rval = MM_MMX;