/*
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* Copyright © 2012 Intel Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial
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* portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <time.h>
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#include <assert.h>
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#include "wayland-private.h"
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volatile double global_d;
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static void
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noop_conversion(void)
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{
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wl_fixed_t f;
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union {
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int64_t i;
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double d;
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} u;
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for (f = 0; f < INT32_MAX; f++) {
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u.i = f;
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global_d = u.d;
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}
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}
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static void
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magic_conversion(void)
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{
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wl_fixed_t f;
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for (f = 0; f < INT32_MAX; f++)
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global_d = wl_fixed_to_double(f);
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}
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static void
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mul_conversion(void)
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{
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wl_fixed_t f;
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/* This will get optimized into multiplication by 1/256 */
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for (f = 0; f < INT32_MAX; f++)
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global_d = f / 256.0;
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}
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double factor = 256.0;
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static void
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div_conversion(void)
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{
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wl_fixed_t f;
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for (f = 0; f < INT32_MAX; f++)
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global_d = f / factor;
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}
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static void
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benchmark(const char *s, void (*f)(void))
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{
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struct timespec start, stop, elapsed;
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clock_gettime(CLOCK_MONOTONIC, &start);
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f();
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clock_gettime(CLOCK_MONOTONIC, &stop);
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elapsed.tv_sec = stop.tv_sec - start.tv_sec;
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elapsed.tv_nsec = stop.tv_nsec - start.tv_nsec;
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if (elapsed.tv_nsec < 0) {
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elapsed.tv_nsec += 1000000000;
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elapsed.tv_sec--;
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}
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printf("benchmarked %s:\t%ld.%09lds\n",
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s, elapsed.tv_sec, elapsed.tv_nsec);
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}
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int main(void)
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{
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benchmark("noop", noop_conversion);
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benchmark("magic", magic_conversion);
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benchmark("div", div_conversion);
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benchmark("mul", mul_conversion);
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return 0;
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}
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