mirror of
https://github.com/gryf/wmaker.git
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69 lines
1.3 KiB
C
69 lines
1.3 KiB
C
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inline static void
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cycle_bench(int start)
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{
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static volatile unsigned int start_cycle;
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if (start) {
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asm volatile
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("pushl %%edx \n\t"
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"rdtsc \n\t"
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"movl %%eax,%0 \n\t"
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"cld \n\t"
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"popl %%edx \n\t"
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"nop \n\t"
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"nop \n\t"
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"nop \n\t"
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"nop \n\t"
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"nop \n\t"
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"nop \n\t"
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"nop \n\t"
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"nop \n\t"
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: "=m" (start_cycle) : : "eax", "edx");
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} else {
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volatile int end;
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asm volatile
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("pushl %%edx \n\t"
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"clc \n\t"
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"rdtsc \n\t"
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"movl %%eax, %0 \n\t"
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"popl %%edx \n\t"
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: "=m" (end) : : "eax", "edx");
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printf("Cycle count = %u\n", end - start_cycle - 68);
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}
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}
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#if 0
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// seems linux doesnt allow user progs to exec rdpcm..
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inline static void
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cache_bench(int start)
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{
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static int start_cycle;
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if (start) {
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asm volatile(
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"movl $1,%%ecx \n\t"
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"rdpmc \n\t"
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"movl %%eax,%0 \n\t"
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: "=m" (start_cycle));
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} else {
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int end;
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asm volatile(
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"movl $1,%%ecx \n\t"
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"rdpmc \n\t"
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"movl %%eax,%0"
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: "=m" (end));
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printf("Cache reloads counted = %i\n", end - start_cycle);
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}
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}
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#endif
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