benchtests/bench-strcat.c

   1 /* Measure strcat 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 #define TEST_NAME "strcat"
  21 #include "bench-string.h"
  22
  23 typedef char *(*proto_t) (char *, const char *);
  24 char *simple_strcat (char *, const char *);
  25
  26 IMPL (simple_strcat, 0)
  27 IMPL (strcat, 1)
  28
  29 char *
  30 simple_strcat (char *dst, const char *src)
  31 {
  32   char *ret = dst;
  33   while (*dst++ != '\0');
  34   --dst;
  35   while ((*dst++ = *src++) != '\0');
  36   return ret;
  37 }
  38
  39 static void
  40 do_one_test (impl_t *impl, char *dst, const char *src)
  41 {
  42   size_t k = strlen (dst), i, iters = INNER_LOOP_ITERS;
  43   timing_t start, stop, cur;
  44
  45   if (CALL (impl, dst, src) != dst)
  46     {
  47       error (0, 0, "Wrong result in function %s %p %p", impl->name,
  48              CALL (impl, dst, src), dst);
  49       ret = 1;
  50       return;
  51     }
  52
  53   if (strcmp (dst + k, src) != 0)
  54     {
  55       error (0, 0, "Wrong result in function %s dst \"%s\" src \"%s\"",
  56              impl->name, dst, src);
  57       ret = 1;
  58       return;
  59     }
  60
  61   TIMING_NOW (start);
  62   for (i = 0; i < iters; ++i)
  63     {
  64       dst[k] = '\0';
  65       CALL (impl, dst, src);
  66     }
  67   TIMING_NOW (stop);
  68
  69   TIMING_DIFF (cur, start, stop);
  70
  71   TIMING_PRINT_MEAN ((double) cur, (double) iters);
  72 }
  73
  74 static void
  75 do_test (size_t align1, size_t align2, size_t len1, size_t len2, int max_char)
  76 {
  77   size_t i;
  78   char *s1, *s2;
  79
  80   align1 &= 7;
  81   if (align1 + len1 >= page_size)
  82     return;
  83
  84   align2 &= 7;
  85   if (align2 + len1 + len2 >= page_size)
  86     return;
  87
  88   s1 = (char *) (buf1 + align1);
  89   s2 = (char *) (buf2 + align2);
  90
  91   for (i = 0; i < len1; ++i)
  92     s1[i] = 32 + 23 * i % (max_char - 32);
  93   s1[len1] = '\0';
  94
  95   for (i = 0; i < len2; i++)
  96     s2[i] = 32 + 23 * i % (max_char - 32);
  97
  98   printf ("Length %4zd/%4zd, alignment %2zd/%2zd:", len1, len2, align1, align2);
  99
 100   FOR_EACH_IMPL (impl, 0)
 101     {
 102       s2[len2] = '\0';
 103       do_one_test (impl, s2, s1);
 104     }
 105
 106   putchar ('\n');
 107 }
 108
 109 int
 110 test_main (void)
 111 {
 112   size_t i;
 113
 114   test_init ();
 115
 116   printf ("%28s", "");
 117   FOR_EACH_IMPL (impl, 0)
 118     printf ("\t%s", impl->name);
 119   putchar ('\n');
 120
 121   for (i = 0; i < 16; ++i)
 122     {
 123       do_test (0, 0, i, i, 127);
 124       do_test (0, 0, i, i, 255);
 125       do_test (0, i, i, i, 127);
 126       do_test (i, 0, i, i, 255);
 127     }
 128
 129   for (i = 1; i < 8; ++i)
 130     {
 131       do_test (0, 0, 8 << i, 8 << i, 127);
 132       do_test (8 - i, 2 * i, 8 << i, 8 << i, 127);
 133       do_test (0, 0, 8 << i, 2 << i, 127);
 134       do_test (8 - i, 2 * i, 8 << i, 2 << i, 127);
 135     }
 136
 137   for (i = 1; i < 8; ++i)
 138     {
 139       do_test (i, 2 * i, 8 << i, 1, 127);
 140       do_test (2 * i, i, 8 << i, 1, 255);
 141       do_test (i, i, 8 << i, 10, 127);
 142       do_test (i, i, 8 << i, 10, 255);
 143     }
 144
 145   return ret;
 146 }
 147
 148 #include "../test-skeleton.c"