Author: James Robertson
Date: 10:20:13 08/09/00
Go up one level in this thread
On August 08, 2000 at 13:11:55, J. Wesley Cleveland wrote:
>On August 08, 2000 at 02:34:54, James Robertson wrote:
>
>>On August 08, 2000 at 01:54:48, Andrew Dados wrote:
>>
>>>On August 08, 2000 at 00:25:06, James Robertson wrote:
>>>
>>>>I am trying to measure clock cycles for certain functions in my program. Could
>>>>sombodey please explain how to do this? Totally simple methods are preferred. :)
>>>>
>>>>Thanks!
>>>>James
>>>
>>>All modern CPUs starting with Pentium and K2 have TSC 64 bit counter which gets
>>>incremented by 1 for each CPU clock.
>>>Under protected mode reading from this counter is by default disabled, but for
>>>some reason any task can enable instruction for reading TSC.
>>>
>>>(I'll be quoting asm code I wrote before some instructions were supplied by C
>>>inline asm, so in some cases I had to define instructions myself)
>>>
>>>enabling TSC:
>>>
>>>asm
>>
>>Thanks, this looks cool. Unfortunately, I don't know how to interpret the db
>>instructions... how can I use them in VC++?
>>
>
>This works in VC++ and compiles to just a rdtsc instruction.
>
>#pragma warning(disable:4035)
>inline __int64 Timer_ReadTSC_sys(void)
>{
> __asm rdtsc
>}
Very elegant; thanks.
James
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