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      1 /*
      2  * Copyright  2012 Intel Corporation
      3  *
      4  * Permission is hereby granted, free of charge, to any person obtaining
      5  * a copy of this software and associated documentation files (the
      6  * "Software"), to deal in the Software without restriction, including
      7  * without limitation the rights to use, copy, modify, merge, publish,
      8  * distribute, sublicense, and/or sell copies of the Software, and to
      9  * permit persons to whom the Software is furnished to do so, subject to
     10  * the following conditions:
     11  *
     12  * The above copyright notice and this permission notice (including the
     13  * next paragraph) shall be included in all copies or substantial
     14  * portions of the Software.
     15  *
     16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
     17  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
     18  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
     19  * NONINFRINGEMENT.  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
     20  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
     21  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
     22  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
     23  * SOFTWARE.
     24  */
     25 
     26 #include <stdlib.h>
     27 #include <stdio.h>
     28 #include <string.h>
     29 #include <time.h>
     30 #include <assert.h>
     31 #include "wayland-private.h"
     32 
     33 volatile double global_d;
     34 
     35 static void
     36 noop_conversion(void)
     37 {
     38 	wl_fixed_t f;
     39 	union {
     40 		int64_t i;
     41 		double d;
     42 	} u;
     43 
     44 	for (f = 0; f < INT32_MAX; f++) {
     45 		u.i = f;
     46 		global_d = u.d;
     47 	}
     48 }
     49 
     50 static void
     51 magic_conversion(void)
     52 {
     53 	wl_fixed_t f;
     54 
     55 	for (f = 0; f < INT32_MAX; f++)
     56 		global_d = wl_fixed_to_double(f);
     57 }
     58 
     59 static void
     60 mul_conversion(void)
     61 {
     62 	wl_fixed_t f;
     63 
     64 	/* This will get optimized into multiplication by 1/256 */
     65 	for (f = 0; f < INT32_MAX; f++)
     66 		global_d = f / 256.0;
     67 }
     68 
     69 double factor = 256.0;
     70 
     71 static void
     72 div_conversion(void)
     73 {
     74 	wl_fixed_t f;
     75 
     76 	for (f = 0; f < INT32_MAX; f++)
     77 		global_d = f / factor;
     78 }
     79 
     80 static void
     81 benchmark(const char *s, void (*f)(void))
     82 {
     83 	struct timespec start, stop, elapsed;
     84 
     85 	clock_gettime(CLOCK_MONOTONIC, &start);
     86 	f();
     87 	clock_gettime(CLOCK_MONOTONIC, &stop);
     88 
     89 	elapsed.tv_sec = stop.tv_sec - start.tv_sec;
     90 	elapsed.tv_nsec = stop.tv_nsec - start.tv_nsec;
     91 	if (elapsed.tv_nsec < 0) {
     92 		elapsed.tv_nsec += 1000000000;
     93 		elapsed.tv_sec--;
     94 	}
     95 	printf("benchmarked %s:\t%ld.%09lds\n",
     96 	       s, elapsed.tv_sec, elapsed.tv_nsec);
     97 }
     98 
     99 int main(void)
    100 {
    101 	benchmark("noop", noop_conversion);
    102 	benchmark("magic", magic_conversion);
    103 	benchmark("div", div_conversion);
    104 	benchmark("mul", mul_conversion);
    105 
    106 	return 0;
    107 }
    108