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/*
* perf_memset_s.c
* with the 64bit version.
*
* gcc-7 darwin:
* objsize --disable-constraint-handler
* memset_s.o 760
* default:
* memset_s.o 1464 +92%, 704 bytes
*
* Speed overhead: 0 - 16%
*
* clang-7 darwin:
* objsize --disable-constraint-handler
* memset_s.o 784
* default:
* memset_s.o 1228 +56%, 444 bytes
*
* Speed overhead: -1 - 2%
*/
#include "test_private.h"
#include "safe_mem_lib.h"
#ifndef __KERNEL__
#ifdef TIME_WITH_SYS_TIME
#include <sys/time.h>
#include <time.h>
#else
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#else
#include <time.h>
#endif
#endif
#elif !defined(__x86_64__) && !defined(__i386__)
#error Not supported in Linux kernel space
#endif
#if defined(TEST_MSVCRT) && defined(HAVE_MEMSET_S)
#undef memset_s
#endif
#define LEN (1024 * 10)
uint8_t mem1[LEN];
uint8_t mem2[LEN];
static inline clock_t rdtsc();
static double timing_loop(uint32_t len, uint32_t loops);
int main(void);
static inline clock_t rdtsc() {
#ifdef __x86_64__
uint64_t a, d;
__asm__ volatile("rdtsc" : "=a"(a), "=d"(d));
return (clock_t)(a | (d << 32));
#elif defined(__i386__)
clock_t x;
__asm__ volatile("rdtsc" : "=A"(x));
return x;
#else
#define NO_CYCLE_COUNTER
return clock();
#endif
}
static double timing_loop(uint32_t len, uint32_t loops) {
uint32_t i;
size_t errors = 0;
clock_t clock_start;
clock_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; i++) {
mem1[i] = 33;
}
for (i = 0; i < LEN; i++) {
mem2[i] = 44;
}
/*printf("\n Timing %d byte copy, %u loops \n", len, loops); */
/*
* Safe C Lib Routine
*/
clock_start = rdtsc();
for (i = 0; i < loops; i++) {
volatile errno_t rc;
rc = memset_s(mem1, len, 0, len);
errors += rc;
}
clock_end = rdtsc();
/*
* 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 = rdtsc();
for (i = 0; i < loops; i++) {
volatile char *rc;
rc = (char *)memset(mem1, 0, len);
errors += *rc;
}
clock_end = rdtsc();
/*
* 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("%u %u memset_s %1.6f memset %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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