Hello Manoj,
Thanks for your reply. You mention converting to msec. I need usec or nsec
resolution. Do you know if the calls rt_get_time_8254() or
rt_get_time_pentium() provid this level of resolution?
Thanks again,
Todd
> ----------
> From: Manoj Apte[SMTP:[EMAIL PROTECTED]]
> Sent: Friday, March 26, 1999 5:42 PM
> To: Gearheart, Todd
> Cc: '[EMAIL PROTECTED]'
> Subject: Re: [rtl] Digital flight simulator...
>
>
> I use this macro to compute the time. I have a pentium pro 200, so I do
> a multiply by 5 to get the time in milliseconds from the ticks returned by
> rdtsc. So its a lil more expensive than doing a simple rdtsc. The cpuid
> call is to flush the pipeline before rdtsc, to serialize.
>
> #define CPUCLK_PERIOD 5
> #define __NAME_STRING(x) #x
> #define NAME_STRING(x) __NAME_STRING(x)
>
> #define rt_get_nstime(llptr) \
> __asm__ __volatile__ ( \
> "xor %%eax, %%eax\n\t" \
> "cpuid \n\t" \
> "rdtsc \n\t" \
> "movl %%eax, %%ebx \n\t"\
> "movl %%edx, %%eax \n\t"\
> "movl $"NAME_STRING(CPUCLK_PERIOD)", %%ecx \n\t"\
> "mull %%ecx \n\t"\
> "movl %%eax,%%edx \n\t"\
> "movl %%ebx,%%eax \n\t" \
> "movl %%edx,%%ebx \n\t" \
> "mull %%ecx \n\t"\
> "addl %%ebx,%%edx \n\t"\
> : "=A" (llptr) \
> : : "eax","ebx","ecx","edx","memory")
>
> ==========================================================================
> ====
> _|_
> MANOJ APTE -----------(o)----------- 500 Louisville St,
> #59
> High Performance Computing Lab Starkville, MS 39759
> phone: (601) 325 7503 phone: (601) 323
> 8160
>
> Engineering Research Center. email: [EMAIL PROTECTED]
> phone: (601) 325 2476
> http://www.erc.msstate.edu/~manoj
> ==========================================================================
> ====
>
>
>
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