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x86/cpu: implement support for cpuid through intrinsics

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Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Ronald S. Bultje 2012-07-09 02:21:27 +02:00 committed by Martin Storsjö
parent 3f150ffba3
commit c0ee695bd7
2 changed files with 16 additions and 0 deletions
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2
configure vendored
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@ -1061,6 +1061,7 @@ HAVE_LIST="
cbrtf
closesocket
cmov
cpuid
dcbzl
dev_bktr_ioctl_bt848_h
dev_bktr_ioctl_meteor_h
@ -2744,6 +2745,7 @@ elif enabled sparc; then
elif enabled x86; then
check_code ld immintrin.h "__xgetbv(0)" && enable xgetbv
check_code ld intrin.h "int info[4]; __cpuid(info, 0)" && enable cpuid
check_code ld intrin.h "__rdtsc()" && enable rdtsc
check_code ld mmintrin.h "_mm_empty()" && enable mm_empty

14
libavutil/x86/cpu.c
View File

@ -25,6 +25,7 @@
#include "libavutil/x86_cpu.h"
#include "libavutil/cpu.h"
#if HAVE_INLINE_ASM
/* ebx saving is necessary for PIC. gcc seems unable to see it alone */
#define cpuid(index, eax, ebx, ecx, edx) \
__asm__ volatile ( \
@ -33,6 +34,19 @@
"xchg %%"REG_b", %%"REG_S \
: "=a" (eax), "=S" (ebx), "=c" (ecx), "=d" (edx) \
: "0" (index))
#elif HAVE_CPUID
#include <intrin.h>
#define cpuid(index, eax, ebx, ecx, edx) \
do { \
int info[4]; \
__cpuid(info, index); \
eax = info[0]; \
ebx = info[1]; \
ecx = info[2]; \
edx = info[3]; \
} while (0)
#endif /* HAVE_CPUID */
#if HAVE_INLINE_ASM
#define xgetbv(index, eax, edx) \