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add an AMD64 specific implementation of rdtsc()

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Originally committed as revision 4135 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Aurelien Jacobs 2005-04-18 11:24:20 +00:00
parent 6c618a263d
commit 8230cf0210
1 changed files with 11 additions and 0 deletions
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11
libavcodec/common.h
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@ -457,6 +457,16 @@ if((y)<(x)){\
#endif
#if defined(ARCH_X86) || defined(ARCH_X86_64)
#if defined(ARCH_X86_64)
static inline uint64_t rdtsc(void)
{
uint64_t a, d;
asm volatile( "rdtsc\n\t"
: "=a" (a), "=d" (d)
);
return (d << 32) | (a & 0xffffffff);
}
#else
static inline long long rdtsc(void)
{
long long l;
@ -465,6 +475,7 @@ static inline long long rdtsc(void)
);
return l;
}
#endif
#define START_TIMER \
uint64_t tend;\