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remove memory in the clobber list because rdtsp is a serializing instr.

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This commit is contained in:
Stefan Lankes 2016-05-03 17:37:11 +02:00
parent 95f51da71f
commit 692920ff93
1 changed files with 1 additions and 10 deletions
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11
hermit/usr/benchmarks/basic.c
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@ -62,24 +62,15 @@ void reschedule(void);
static char* buff[M];
#if 0
inline static unsigned long long rdtsc(void)
{
unsigned long lo, hi;
asm volatile ("rdtsc" : "=a"(lo), "=d"(hi) :: "memory");
return ((unsigned long long) hi << 32ULL | (unsigned long long) lo);
}
#else
inline static unsigned long long rdtsc(void)
{
unsigned int lo, hi;
unsigned int id;
asm volatile ("rdtscp" : "=a"(lo), "=c"(id), "=d"(hi) :: "memory");
asm volatile ("rdtscp" : "=a"(lo), "=c"(id), "=d"(hi));
return ((unsigned long long)hi << 32ULL | (unsigned long long)lo);
}
#endif
int main(int argc, char** argv)
{