diff options
Diffstat (limited to 'ACE/ace/OS_NS_time.inl')
| -rw-r--r-- | ACE/ace/OS_NS_time.inl | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/ACE/ace/OS_NS_time.inl b/ACE/ace/OS_NS_time.inl index 585e1b04d5a..fe1804c04e7 100644 --- a/ACE/ace/OS_NS_time.inl +++ b/ACE/ace/OS_NS_time.inl @@ -261,9 +261,17 @@ ACE_OS::gethrtime (const ACE_HRTimer_Op op) ACE_hrtime_t now; # endif /* ! ACE_LACKS_LONGLONG_T */ +#if defined (__amd64__) || defined (__x86_64__) + // Read the high res tick counter into 32 bit int variables "eax" and + // "edx", and then combine them into 64 bit int "now" + ACE_UINT32 eax, edx; + asm volatile ("rdtsc" : "=a" (eax), "=d" (edx) : : "memory"); + now = (((ACE_UINT64) eax) | (((ACE_UINT64) edx) << 32)); +#else // Read the high-res tick counter directly into memory variable "now". // The A constraint signifies a 64-bit int. asm volatile ("rdtsc" : "=A" (now) : : "memory"); +#endif # if defined (ACE_LACKS_LONGLONG_T) ACE_UINT32 least, most; |