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benchmark on pentium stuff

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kojima
2000-01-14 23:37:20 +00:00
parent 7df3e111bc
commit 18cbed4750
1 changed files with 68 additions and 0 deletions
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68
wrlib/bench.h Normal file
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@@ -0,0 +1,68 @@
inline static void
cycle_bench(int start)
{
static volatile unsigned int start_cycle;
if (start) {
asm volatile
("pushl %%edx \n\t"
"rdtsc \n\t"
"movl %%eax,%0 \n\t"
"cld \n\t"
"popl %%edx \n\t"
"nop \n\t"
"nop \n\t"
"nop \n\t"
"nop \n\t"
"nop \n\t"
"nop \n\t"
"nop \n\t"
"nop \n\t"
: "=m" (start_cycle) : : "eax", "edx");
} else {
volatile int end;
asm volatile
("pushl %%edx \n\t"
"clc \n\t"
"rdtsc \n\t"
"movl %%eax, %0 \n\t"
"popl %%edx \n\t"
: "=m" (end) : : "eax", "edx");
printf("Cycle count = %u\n", end - start_cycle - 68);
}
}
#if 0
// seems linux doesnt allow user progs to exec rdpcm..
inline static void
cache_bench(int start)
{
static int start_cycle;
if (start) {
asm volatile(
"movl $1,%%ecx \n\t"
"rdpmc \n\t"
"movl %%eax,%0 \n\t"
: "=m" (start_cycle));
} else {
int end;
asm volatile(
"movl $1,%%ecx \n\t"
"rdpmc \n\t"
"movl %%eax,%0"
: "=m" (end));
printf("Cache reloads counted = %i\n", end - start_cycle);
}
}
#endif