benchtests/bench-memcpy.c

   1 /* Measure memcpy 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 #ifndef MEMCPY_RESULT
  20 # define MEMCPY_RESULT(dst, len) dst
  21 # define MIN_PAGE_SIZE 131072
  22 # define TEST_MAIN
  23 # define TEST_NAME "memcpy"
  24 # include "bench-string.h"
  25
  26 char *simple_memcpy (char *, const char *, size_t);
  27 char *builtin_memcpy (char *, const char *, size_t);
  28
  29 IMPL (simple_memcpy, 0)
  30 IMPL (builtin_memcpy, 0)
  31 IMPL (memcpy, 1)
  32
  33 char *
  34 simple_memcpy (char *dst, const char *src, size_t n)
  35 {
  36   char *ret = dst;
  37   while (n--)
  38     *dst++ = *src++;
  39   return ret;
  40 }
  41
  42 char *
  43 builtin_memcpy (char *dst, const char *src, size_t n)
  44 {
  45   return __builtin_memcpy (dst, src, n);
  46 }
  47 #endif
  48
  49 typedef char *(*proto_t) (char *, const char *, size_t);
  50
  51 static void
  52 do_one_test (impl_t *impl, char *dst, const char *src,
  53              size_t len)
  54 {
  55   if (CALL (impl, dst, src, len) != MEMCPY_RESULT (dst, len))
  56     {
  57       error (0, 0, "Wrong result in function %s %p %p", impl->name,
  58              CALL (impl, dst, src, len), MEMCPY_RESULT (dst, len));
  59       ret = 1;
  60       return;
  61     }
  62
  63   if (memcmp (dst, src, len) != 0)
  64     {
  65       error (0, 0, "Wrong result in function %s dst \"%s\" src \"%s\"",
  66              impl->name, dst, src);
  67       ret = 1;
  68       return;
  69     }
  70
  71   if (HP_TIMING_AVAIL)
  72     {
  73       hp_timing_t start __attribute ((unused));
  74       hp_timing_t stop __attribute ((unused));
  75       hp_timing_t best_time = ~ (hp_timing_t) 0;
  76       size_t i;
  77
  78       for (i = 0; i < 32; ++i)
  79         {
  80           HP_TIMING_NOW (start);
  81           CALL (impl, dst, src, len);
  82           HP_TIMING_NOW (stop);
  83           HP_TIMING_BEST (best_time, start, stop);
  84         }
  85
  86       printf ("\t%zd", (size_t) best_time);
  87     }
  88 }
  89
  90 static void
  91 do_test (size_t align1, size_t align2, size_t len)
  92 {
  93   size_t i, j;
  94   char *s1, *s2;
  95
  96   align1 &= 63;
  97   if (align1 + len >= page_size)
  98     return;
  99
 100   align2 &= 63;
 101   if (align2 + len >= page_size)
 102     return;
 103
 104   s1 = (char *) (buf1 + align1);
 105   s2 = (char *) (buf2 + align2);
 106
 107   for (i = 0, j = 1; i < len; i++, j += 23)
 108     s1[i] = j;
 109
 110   if (HP_TIMING_AVAIL)
 111     printf ("Length %4zd, alignment %2zd/%2zd:", len, align1, align2);
 112
 113   FOR_EACH_IMPL (impl, 0)
 114     do_one_test (impl, s2, s1, len);
 115
 116   if (HP_TIMING_AVAIL)
 117     putchar ('\n');
 118 }
 119
 120 int
 121 test_main (void)
 122 {
 123   size_t i;
 124
 125   test_init ();
 126
 127   printf ("%23s", "");
 128   FOR_EACH_IMPL (impl, 0)
 129     printf ("\t%s", impl->name);
 130   putchar ('\n');
 131
 132   for (i = 0; i < 18; ++i)
 133     {
 134       do_test (0, 0, 1 << i);
 135       do_test (i, 0, 1 << i);
 136       do_test (0, i, 1 << i);
 137       do_test (i, i, 1 << i);
 138     }
 139
 140   for (i = 0; i < 32; ++i)
 141     {
 142       do_test (0, 0, i);
 143       do_test (i, 0, i);
 144       do_test (0, i, i);
 145       do_test (i, i, i);
 146     }
 147
 148   for (i = 3; i < 32; ++i)
 149     {
 150       if ((i & (i - 1)) == 0)
 151         continue;
 152       do_test (0, 0, 16 * i);
 153       do_test (i, 0, 16 * i);
 154       do_test (0, i, 16 * i);
 155       do_test (i, i, 16 * i);
 156     }
 157
 158   do_test (0, 0, getpagesize ());
 159
 160   return ret;
 161 }
 162
 163 #include "../test-skeleton.c"