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/*
* perf_strcpy_s.c
*
* gcc-7 darwin:
* objsize --disable-constraint-handler
* strcpy_s.o 1464
* default:
* strcpy_s.o 1972 +34.7%, 508 bytes
*
* Speed overhead: 91% --disable-constraint-handler
* 91% default
*
* clang-7 darwin:
* --disable-constraint-handler
* strcpy_s.o 1132
* with:
* strcpy_s.o 1688 +33.1%, 420 bytes
*
* Speed overhead: 89% --disable-constraint-handler
* 90% default
*/
#include "test_private.h"
#include "safe_str_lib.h"
#include "perf_private.h"
#if defined(TEST_MSVCRT) && defined(HAVE_STRCPY_S)
#undef strcpy_s
#endif
#define LEN (1024)
char str1[LEN];
char str2[LEN];
static double timing_loop(uint32_t len, uint32_t loops) {
uint32_t i;
size_t errors = 0;
uint64_t clock_start;
uint64_t clock_end;
clock_t sl_clock_diff;
clock_t sd_clock_diff;
double sl_clock_dur;
double sd_clock_dur;
double percent;
for (i = 0; i < LEN - 1; i++) {
str1[i] = 33;
}
for (i = 0; i < LEN - 1; i++) {
str2[i] = 44;
}
str1[LEN - 1] = '\0';
str2[LEN - 1] = '\0';
/*printf("\n Timing %d byte copy, %u loops \n", len, loops); */
/*
* Safe C Lib Routine
*/
clock_start = timer_start();
for (i = 0; i < loops; i++) {
volatile errno_t rc;
rc = strcpy_s(str1, LEN, str2);
errors += rc;
}
clock_end = timer_end();
/*
* Note that background stuff continues to run, i.e. interrupts, so
* we need to compute average time per loop
*/
sl_clock_diff = (clock_end - clock_start) / loops;
/*
* Standard C Routine
*/
clock_start = timer_start();
for (i = 0; i < loops; i++) {
volatile char *rc;
rc = strcpy(str1, str2);
errors += *rc;
}
clock_end = timer_end();
/*
* Note that background stuff continues to run, i.e. interrupts, so
* we need to compute average time per loop
*/
sd_clock_diff = (clock_end - clock_start) / loops;
/* convert to seconds */
sl_clock_dur = ((double)(sl_clock_diff) / CLOCKS_PER_SEC);
sd_clock_dur = ((double)(sd_clock_diff) / CLOCKS_PER_SEC);
percent = 100 * (sl_clock_dur - sd_clock_dur) / sl_clock_dur;
/* just to disable optimizing away the inner loop */
/* fprintf(stderr, "errors %lu\n", errors); */
printf("%"PRIu32" %"PRIu32" strcpy_s %1.6f strcpy %1.6f diff %1.6f %2.2f %%\n",
loops, len, sl_clock_dur, sd_clock_dur,
(sl_clock_dur - sd_clock_dur), percent);
return percent;
}
int main(void) {
double avg = 0.0;
printf("\n");
avg += timing_loop(1024, 400);
avg += timing_loop(1024 * 2, 400);
avg += timing_loop(1024 * 3, 400);
avg += timing_loop(1024 * 4, 400);
avg += timing_loop(1024 * 5, 400);
avg += timing_loop(1024 * 6, 400);
avg += timing_loop(1024 * 7, 400);
avg += timing_loop(1024 * 8, 400);
printf("avg: %2.2f%%\n", avg / 8.0);
/*--------------------------------------------------*/
printf("\n");
avg += timing_loop(1024, 600);
avg += timing_loop(1024 * 2, 600);
avg += timing_loop(1024 * 3, 600);
avg += timing_loop(1024 * 4, 600);
avg += timing_loop(1024 * 5, 600);
avg += timing_loop(1024 * 6, 600);
avg += timing_loop(1024 * 7, 600);
avg += timing_loop(1024 * 8, 600);
printf("avg: %2.2f%%\n", avg / 16.0);
/*--------------------------------------------------*/
printf("\n");
avg += timing_loop(1024, 800);
avg += timing_loop(1024 * 2, 800);
avg += timing_loop(1024 * 3, 800);
avg += timing_loop(1024 * 4, 800);
avg += timing_loop(1024 * 5, 800);
avg += timing_loop(1024 * 6, 800);
avg += timing_loop(1024 * 7, 800);
avg += timing_loop(1024 * 8, 800);
printf("\nsum: %2.2f %%\n", avg / 24.0);
/*--------------------------------------------------*/
return (0);
}
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