benchtests/bench-memset.c

   1 /* Measure memset functions.
   2    Copyright (C) 2013 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #define TEST_MAIN
  20 #ifdef TEST_BZERO
  21 # define TEST_NAME "bzero"
  22 #else
  23 # define TEST_NAME "memset"
  24 #endif
  25 #define MIN_PAGE_SIZE 131072
  26 #include "bench-string.h"
  27
  28 char *simple_memset (char *, int, size_t);
  29
  30 #ifdef TEST_BZERO
  31 typedef void (*proto_t) (char *, size_t);
  32 void simple_bzero (char *, size_t);
  33 void builtin_bzero (char *, size_t);
  34
  35 IMPL (simple_bzero, 0)
  36 IMPL (builtin_bzero, 0)
  37 IMPL (bzero, 1)
  38
  39 void
  40 simple_bzero (char *s, size_t n)
  41 {
  42   simple_memset (s, 0, n);
  43 }
  44
  45 void
  46 builtin_bzero (char *s, size_t n)
  47 {
  48   __builtin_bzero (s, n);
  49 }
  50 #else
  51 typedef char *(*proto_t) (char *, int, size_t);
  52 char *builtin_memset (char *, int, size_t);
  53
  54 IMPL (simple_memset, 0)
  55 IMPL (builtin_memset, 0)
  56 IMPL (memset, 1)
  57
  58 char *
  59 builtin_memset (char *s, int c, size_t n)
  60 {
  61   return __builtin_memset (s, c, n);
  62 }
  63 #endif
  64
  65 char *
  66 inhibit_loop_to_libcall
  67 simple_memset (char *s, int c, size_t n)
  68 {
  69   char *r = s, *end = s + n;
  70   while (r < end)
  71     *r++ = c;
  72   return s;
  73 }
  74
  75 static void
  76 do_one_test (impl_t *impl, char *s, int c __attribute ((unused)), size_t n)
  77 {
  78   char tstbuf[n];
  79 #ifdef TEST_BZERO
  80   simple_bzero (tstbuf, n);
  81   CALL (impl, s, n);
  82   if (memcmp (s, tstbuf, n) != 0)
  83 #else
  84   char *res = CALL (impl, s, c, n);
  85   if (res != s
  86       || simple_memset (tstbuf, c, n) != tstbuf
  87       || memcmp (s, tstbuf, n) != 0)
  88 #endif
  89     {
  90       error (0, 0, "Wrong result in function %s", impl->name);
  91       ret = 1;
  92       return;
  93     }
  94
  95   if (HP_TIMING_AVAIL)
  96     {
  97       hp_timing_t start __attribute ((unused));
  98       hp_timing_t stop __attribute ((unused));
  99       hp_timing_t best_time = ~ (hp_timing_t) 0;
 100       size_t i;
 101
 102       for (i = 0; i < 32; ++i)
 103         {
 104           HP_TIMING_NOW (start);
 105 #ifdef TEST_BZERO
 106           CALL (impl, s, n);
 107 #else
 108           CALL (impl, s, c, n);
 109 #endif
 110
 111           HP_TIMING_NOW (stop);
 112           HP_TIMING_BEST (best_time, start, stop);
 113         }
 114
 115       printf ("\t%zd", (size_t) best_time);
 116     }
 117 }
 118
 119 static void
 120 do_test (size_t align, int c, size_t len)
 121 {
 122   align &= 7;
 123   if (align + len > page_size)
 124     return;
 125
 126   if (HP_TIMING_AVAIL)
 127     printf ("Length %4zd, alignment %2zd, c %2d:", len, align, c);
 128
 129   FOR_EACH_IMPL (impl, 0)
 130     do_one_test (impl, (char *) buf1 + align, c, len);
 131
 132   if (HP_TIMING_AVAIL)
 133     putchar ('\n');
 134 }
 135
 136 int
 137 test_main (void)
 138 {
 139   size_t i;
 140   int c = 0;
 141
 142   test_init ();
 143
 144   printf ("%24s", "");
 145   FOR_EACH_IMPL (impl, 0)
 146     printf ("\t%s", impl->name);
 147   putchar ('\n');
 148
 149 #ifndef TEST_BZERO
 150   for (c = -65; c <= 130; c += 65)
 151 #endif
 152     {
 153       for (i = 0; i < 18; ++i)
 154         do_test (0, c, 1 << i);
 155       for (i = 1; i < 32; ++i)
 156         {
 157           do_test (i, c, i);
 158           if (i & (i - 1))
 159             do_test (0, c, i);
 160         }
 161       do_test (1, c, 14);
 162       do_test (3, c, 1024);
 163       do_test (4, c, 64);
 164       do_test (2, c, 25);
 165     }
 166
 167   return ret;
 168 }
 169
 170 #include "../test-skeleton.c"