aaron/ispc
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

Fix 32-bit samples on Mac OS X.

Browse Source 
On Mac OS X and Linux rdtsc() didn't save and restore 32-bit registers.

This patch fixes issue #87.
This commit is contained in:
John Poole
2012-04-23 16:00:07 -07:00
parent 903714fd40
commit cd98a29a4b
1 changed files with 6 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
examples/timing.h
View File

@@ -43,9 +43,15 @@ extern "C" {
#endif /* __cplusplus */ #endif /* __cplusplus */
__inline__ uint64_t rdtsc() { __inline__ uint64_t rdtsc() {
uint32_t low, high; uint32_t low, high;
#ifdef __x86_64
__asm__ __volatile__ ( __asm__ __volatile__ (
"xorl %%eax,%%eax \n cpuid" "xorl %%eax,%%eax \n cpuid"
::: "%rax", "%rbx", "%rcx", "%rdx" ); ::: "%rax", "%rbx", "%rcx", "%rdx" );
#else
__asm__ __volatile__ (
"xorl %%eax,%%eax \n cpuid"
::: "%eax", "%ebx", "%ecx", "%edx" );
#endif
__asm__ __volatile__ ( __asm__ __volatile__ (
"rdtsc" : "=a" (low), "=d" (high)); "rdtsc" : "=a" (low), "=d" (high));
return (uint64_t)high << 32 | low; return (uint64_t)high << 32 | low;