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use per default rdtsc instead of rdtscp

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because old CPUs don't support the instruction rdtscp
This commit is contained in:
Stefan Lankes 2016-06-28 20:46:33 +02:00
parent 05da1694a1
commit 7d471b4691
1 changed files with 11 additions and 1 deletions
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12
hermit/usr/benchmarks/basic.c
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@ -57,6 +57,14 @@ int sched_yield(void);
static char* buff[M];
#if 1
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;
@ -66,6 +74,7 @@ inline static unsigned long long rdtsc(void)
return ((unsigned long long)hi << 32ULL | (unsigned long long)lo);
}
#endif
int main(int argc, char** argv)
{
@ -74,7 +83,8 @@ int main(int argc, char** argv)
const char str[] = "H";
size_t len = strlen(str);
printf("Determine systems performance\n\n");
printf("Determine systems performance\n");
printf("=============================\n");
// cache warm-up
ret = mygetpid();