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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