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Merge commit 'd1a6cb195f'

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* commit 'd1a6cb195f':
  x86: Serialize rdtsc in read_time()

Merged-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2015-07-09 12:27:55 +02:00
commit 2ecbf44f21
1 changed files with 6 additions and 1 deletions
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7
libavutil/x86/timer.h
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@ -31,7 +31,12 @@
static inline uint64_t read_time(void)
{
uint32_t a, d;
__asm__ volatile("rdtsc" : "=a" (a), "=d" (d));
__asm__ volatile(
#if ARCH_X86_64 || defined(__SSE2__)
"lfence \n\t"
#endif
"rdtsc \n\t"
: "=a" (a), "=d" (d));
return ((uint64_t)d << 32) + a;
}