benchtests/bench-memmove.c

   1 /* Measure memmove functions.
   2    Copyright (C) 2013-2015 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_BCOPY
  21 # define TEST_NAME "bcopy"
  22 #else
  23 # define TEST_NAME "memmove"
  24 #endif
  25 #include "bench-string.h"
  26
  27 char *simple_memmove (char *, const char *, size_t);
  28
  29 #ifdef TEST_BCOPY
  30 typedef void (*proto_t) (const char *, char *, size_t);
  31 void simple_bcopy (const char *, char *, size_t);
  32
  33 IMPL (simple_bcopy, 0)
  34 IMPL (bcopy, 1)
  35
  36 void
  37 simple_bcopy (const char *src, char *dst, size_t n)
  38 {
  39   simple_memmove (dst, src, n);
  40 }
  41 #else
  42 typedef char *(*proto_t) (char *, const char *, size_t);
  43
  44 IMPL (simple_memmove, 0)
  45 IMPL (memmove, 1)
  46 #endif
  47
  48 char *
  49 inhibit_loop_to_libcall
  50 simple_memmove (char *dst, const char *src, size_t n)
  51 {
  52   char *ret = dst;
  53   if (src < dst)
  54     {
  55       dst += n;
  56       src += n;
  57       while (n--)
  58         *--dst = *--src;
  59     }
  60   else
  61     while (n--)
  62       *dst++ = *src++;
  63   return ret;
  64 }
  65
  66 static void
  67 do_one_test (impl_t *impl, char *dst, char *src, const char *orig_src,
  68              size_t len)
  69 {
  70   size_t i, iters = INNER_LOOP_ITERS;
  71   timing_t start, stop, cur;
  72
  73   memcpy (src, orig_src, len);
  74 #ifdef TEST_BCOPY
  75   CALL (impl, src, dst, len);
  76 #else
  77   char *res;
  78
  79   res = CALL (impl, dst, src, len);
  80   if (res != dst)
  81     {
  82       error (0, 0, "Wrong result in function %s %p %p", impl->name,
  83              res, dst);
  84       ret = 1;
  85       return;
  86     }
  87 #endif
  88
  89   if (memcmp (dst, orig_src, len) != 0)
  90     {
  91       error (0, 0, "Wrong result in function %s dst \"%s\" src \"%s\"",
  92              impl->name, dst, src);
  93       ret = 1;
  94       return;
  95     }
  96
  97   TIMING_NOW (start);
  98   for (i = 0; i < iters; ++i)
  99     {
 100 #ifdef TEST_BCOPY
 101       CALL (impl, src, dst, len);
 102 #else
 103       CALL (impl, dst, src, len);
 104 #endif
 105     }
 106   TIMING_NOW (stop);
 107
 108   TIMING_DIFF (cur, start, stop);
 109
 110   TIMING_PRINT_MEAN ((double) cur, (double) iters);
 111 }
 112
 113 static void
 114 do_test (size_t align1, size_t align2, size_t len)
 115 {
 116   size_t i, j;
 117   char *s1, *s2;
 118
 119   align1 &= 63;
 120   if (align1 + len >= page_size)
 121     return;
 122
 123   align2 &= 63;
 124   if (align2 + len >= page_size)
 125     return;
 126
 127   s1 = (char *) (buf1 + align1);
 128   s2 = (char *) (buf2 + align2);
 129
 130   for (i = 0, j = 1; i < len; i++, j += 23)
 131     s1[i] = j;
 132
 133   printf ("Length %4zd, alignment %2zd/%2zd:", len, align1, align2);
 134
 135   FOR_EACH_IMPL (impl, 0)
 136     do_one_test (impl, s2, (char *) (buf2 + align1), s1, len);
 137
 138   putchar ('\n');
 139 }
 140
 141 int
 142 test_main (void)
 143 {
 144   size_t i;
 145
 146   test_init ();
 147
 148   printf ("%23s", "");
 149   FOR_EACH_IMPL (impl, 0)
 150     printf ("\t%s", impl->name);
 151   putchar ('\n');
 152
 153   for (i = 0; i < 14; ++i)
 154     {
 155       do_test (0, 32, 1 << i);
 156       do_test (32, 0, 1 << i);
 157       do_test (0, i, 1 << i);
 158       do_test (i, 0, 1 << i);
 159     }
 160
 161   for (i = 0; i < 32; ++i)
 162     {
 163       do_test (0, 32, i);
 164       do_test (32, 0, i);
 165       do_test (0, i, i);
 166       do_test (i, 0, i);
 167     }
 168
 169   for (i = 3; i < 32; ++i)
 170     {
 171       if ((i & (i - 1)) == 0)
 172         continue;
 173       do_test (0, 32, 16 * i);
 174       do_test (32, 0, 16 * i);
 175       do_test (0, i, 16 * i);
 176       do_test (i, 0, 16 * i);
 177     }
 178
 179   return ret;
 180 }
 181
 182 #include "../test-skeleton.c"