diff options
| author | Yi Luo <luoyi@google.com> | 2016-04-21 15:59:05 -0700 |
|---|---|---|
| committer | Yi Luo <luoyi@google.com> | 2016-04-22 09:34:35 -0700 |
| commit | b547a2f38cfab81f6cbe392b9eb48ab0c12b80cf (patch) | |
| tree | b5a05fed347a6ad885daf4dc3241d4b11582e68e | |
| parent | b816eea5ef619edcef92e8723139e7414d2cf0ba (diff) | |
| download | libvpx-b547a2f38cfab81f6cbe392b9eb48ab0c12b80cf.tar libvpx-b547a2f38cfab81f6cbe392b9eb48ab0c12b80cf.tar.gz libvpx-b547a2f38cfab81f6cbe392b9eb48ab0c12b80cf.tar.bz2 libvpx-b547a2f38cfab81f6cbe392b9eb48ab0c12b80cf.zip | |
Add the 64-bit CPU cycle count utility function
Change-Id: Ie87245bbdf5735bc9729199eeb07899d81dbf267
| -rw-r--r-- | vpx_ports/x86.h | 25 |
1 files changed, 24 insertions, 1 deletions
diff --git a/vpx_ports/x86.h b/vpx_ports/x86.h index 5da346e58..e3ebc5320 100644 --- a/vpx_ports/x86.h +++ b/vpx_ports/x86.h @@ -216,6 +216,11 @@ x86_simd_caps(void) { unsigned __int64 __rdtsc(void); #pragma intrinsic(__rdtsc) #endif +// Note: +// 32-bit CPU cycle counter is light-weighted for most function performance +// measurement. For large function (CPU time > a couple of seconds), 64-bit +// counter should be used. +// 32-bit CPU cycle counter static INLINE unsigned int x86_readtsc(void) { #if defined(__GNUC__) && __GNUC__ @@ -234,7 +239,25 @@ x86_readtsc(void) { #endif #endif } - +// 64-bit CPU cycle counter +static INLINE uint64_t +x86_readtsc64(void) { +#if defined(__GNUC__) && __GNUC__ + uint32_t hi, lo; + __asm__ __volatile__("rdtsc" : "=a"(lo), "=d"(hi)); + return ((uint64_t)hi << 32) | lo; +#elif defined(__SUNPRO_C) || defined(__SUNPRO_CC) + uint_t hi, lo; + asm volatile("rdtsc\n\t" : "=a"(lo), "=d"(hi)); + return ((uint64_t)hi << 32) | lo; +#else +#if ARCH_X86_64 + return (uint64_t)__rdtsc(); +#else + __asm rdtsc; +#endif +#endif +} #if defined(__GNUC__) && __GNUC__ #define x86_pause_hint()\ |