Agronode_feeder/feeder_lib/sensob/libfixmath/fixtest/main.c

#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <time.h>
#include <inttypes.h>

#include <libfixmath/fixmath.h>

#include "hiclock.h"

//#define fix_func      fix16_exp
//#define fix_func_str "fix16_exp"
//#define flt_func      expf
//#define flt_func_str "expf"

//#define fix_func      fix16_atan
//#define fix_func_str "fix16_atan"
//#define flt_func      atanf
//#define flt_func_str "atanf"

#define fix_func      fix16_sin
#define fix_func_str "fix16_sin"
#define flt_func      sinf
#define flt_func_str "sinf"

//#define fix_func      fix16_sqrt
//#define fix_func_str "fix16_sqrt"
//#define flt_func      sqrtf
//#define flt_func_str "sqrtf"



int main(int argc, char** argv) {
    printf("libfixmath test tool\n");

    hiclock_init();

	uintptr_t args = (1 <<  8);
	uintptr_t iter = (1 <<  8);
	uintptr_t pass = (1 <<  8);

	uintptr_t i;
	srand(time(NULL));

	hiclock_t fix_duration = 0;
	hiclock_t flt_duration = 0;
	fix16_t   fix_error = 0;

	uintptr_t k;
	for(k = 0; k < pass; k++) {
		fix16_t fix_args[args];
		for(i = 0; i < args; i++)
			fix_args[i] = (rand() ^ (rand() << 16));
		fix16_t fix_result[args];
		hiclock_t fix_start = hiclock();
		for(i = 0; i < iter; i++) {
			uintptr_t j;
			for(j = 0; j < args; j++)
				fix_result[j] = fix_func(fix_args[j]);
		}
		hiclock_t fix_end = hiclock();

		float   flt_args[args];
		for(i = 0; i < args; i++)
			flt_args[i] = fix16_to_float(fix_args[i]);
		float   flt_result[args];
		hiclock_t flt_start = hiclock();
		for(i = 0; i < iter; i++) {
			uintptr_t j;
			for(j = 0; j < args; j++)
				flt_result[j] = flt_func(flt_args[j]);
		}
		hiclock_t flt_end = hiclock();

		for(i = 0; i < args; i++)
			fix_error += abs(fix16_from_float(flt_result[i]) - fix_result[i]);
		flt_duration += (flt_end - flt_start);
		fix_duration += (fix_end - fix_start);
	}

	printf("%16s: %08"PRIuHICLOCK" @ %"PRIu32"Hz\n", flt_func_str, flt_duration, HICLOCKS_PER_SEC);
	printf("%16s: %08"PRIuHICLOCK" @ %"PRIu32"Hz\n", fix_func_str, fix_duration, HICLOCKS_PER_SEC);
	printf("      Difference: %08"PRIiHICLOCK" (% 3.2f%%)\n", (flt_duration - fix_duration), ((fix_duration * 100.0) / flt_duration));
	printf("           Error: %f%%\n", ((fix16_to_dbl(fix_error) * 100.0) / (args * pass)));

    return EXIT_SUCCESS;
}