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Proper RDTSC implementation for x86_64 targets

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Higher 32 bits of Time Stamp Counter were ignored in non-MSVC Windows and macOS builds
This commit is contained in:
alexey.lysiuk 2017-01-31 17:51:12 +02:00
parent 47faaa87fc
commit 3d147a032c
1 changed files with 7 additions and 3 deletions
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10
src/stats.h
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@ -102,7 +102,7 @@ private:
#else #else
// Windows // Windows and macOS
#include "x86.h" #include "x86.h"
extern double PerfToSec, PerfToMillisec; extern double PerfToSec, PerfToMillisec;
@ -126,15 +126,19 @@ inline unsigned __int64 rdtsc()
#else #else
inline unsigned long long rdtsc() inline unsigned long long rdtsc()
{ {
#ifndef __amd64__ #ifdef __amd64__
unsigned long long tsc;
asm volatile ("rdtsc; shlq $32, %%rdx; orq %%rdx, %%rax" : "=a" (tsc) :: "%rdx");
return tsc;
#else // i386
if (CPU.bRDTSC) if (CPU.bRDTSC)
#endif
{ {
unsigned long long tsc; unsigned long long tsc;
asm volatile ("\trdtsc\n" : "=A" (tsc)); asm volatile ("\trdtsc\n" : "=A" (tsc));
return tsc; return tsc;
} }
return 0; return 0;
#endif // __amd64__
} }
#endif #endif