testbed.c

#include <time.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>

// defined in asma.s
unsigned char *asma(unsigned char *s);
unsigned char *asma_ref(unsigned char *s)  
{  
  int i;
  for (i=0; i<16; i++) {  
    unsigned char c = s[i];  
    c += (c >= 'A' && c <= 'Z') ? 'a' - 'A' : 0;  
    s[i] = c;  
  }  
  return s;  
}

void genrand(unsigned char *arr16){
  for (int i=0; i<4; ++i) {
    ((uint32_t*) arr16)[i] = rand();
  }
}

int main(int argc, char **argv) {
  unsigned char src[17], tmp_ref[17], tmp[17];
  src[16] = 0; tmp_ref[16] = 0; tmp[16] = 0;
  srand((unsigned int) time(NULL));
  int success_count = 0;
  struct timespec clk_b, clk_e;
  long ref_time=0, my_time=0;
  for (int i=0; i<200000; ++i) {
    genrand(src);
    memcpy(tmp, src, 16);
    memcpy(tmp_ref, src, 16);
    
    clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &clk_b);
    asma(tmp);
    clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &clk_e);
    my_time += clk_e.tv_nsec - clk_b.tv_nsec;

    clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &clk_b);    
    asma_ref(tmp_ref);
    clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &clk_e);
    ref_time += clk_e.tv_nsec - clk_b.tv_nsec;

    if (memcmp(tmp, tmp_ref, 16)) {
      printf("Error: #%d: results don't match\n", i);
    }
    else {
      //      printf("Source: %s\nMine: %s\nRef: %s\n", src, tmp, tmp_ref);
      ++success_count;
    }
  }
  printf("%d/200000 examples successful\n", success_count);
  double n = 1000000000;
  printf("ref: %f sec\nme: %f sec\n %f%%\n", ref_time/n, my_time/n, (((double) my_time) - ((double) ref_time)) * 100 / ref_time);
  return 0;
}