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- The variable the result of rdtsc is placed in also needs to be marked as volatile

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to ensure that GCC doesn't optimize the function call away.

SVN r1510 (trunk)
This commit is contained in:
Randy Heit 2009-03-28 03:26:05 +00:00
parent e59ee12f2a
commit 366ed7047a
1 changed files with 1 additions and 1 deletions
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2
src/stats.h
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@ -130,7 +130,7 @@ inline volatile unsigned long long rdtsc()
if (CPU.bRDTSC) if (CPU.bRDTSC)
#endif #endif
{ {
register unsigned long long tsc asm("eax"); register unsigned volatile long long tsc asm("eax");
asm volatile ("\trdtsc\n" : : : "eax", "edx"); asm volatile ("\trdtsc\n" : : : "eax", "edx");
return tsc; return tsc;
} }