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