Commit 91a330bc1adf3d218185bba00d8694b822afd756
1 parent
e453ede6a2
Exists in
master
CPU Measurement # 1 Loop Overhead
Showing 2 changed files with 18 additions and 0 deletions Side-by-side Diff
cpu/loop_overhead_time.c
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91a330b
| 1 | +#include <stdio.h> | |
| 2 | + | |
| 3 | +int main() | |
| 4 | +{ | |
| 5 | + int time1, time2, sum=0; | |
| 6 | + int i; | |
| 7 | + int avg = 0; | |
| 8 | + asm volatile("mrc p15, 0, %0, c9, c14, 0" : "=r" (i)); | |
| 9 | + | |
| 10 | + while(sum < 100) { | |
| 11 | + asm volatile("mrc p15, 0, %0, c9, c13, 0" : "=r" (time1)); | |
| 12 | + for (i = 0; i < 1000; i++); | |
| 13 | + asm volatile("mrc p15, 0, %0, c9, c13, 0" : "=r" (time2)); | |
| 14 | + sum++; | |
| 15 | + avg += (time2 - time1 - 5); | |
| 16 | + printf("Loop overhead: %u\n", avg/(1000)); | |
| 17 | + } | |
| 18 | +} |
cpu/loop_overhead_time.o
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91a330b