benchtests/bench-strcat.c

   1 /* Measure strcat 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 #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);
  43   if (CALL (impl, dst, src) != dst)
  44     {
  45       error (0, 0, "Wrong result in function %s %p %p", impl->name,
  46              CALL (impl, dst, src), dst);
  47       ret = 1;
  48       return;
  49     }
  50
  51   if (strcmp (dst + k, src) != 0)
  52     {
  53       error (0, 0, "Wrong result in function %s dst \"%s\" src \"%s\"",
  54              impl->name, dst, src);
  55       ret = 1;
  56       return;
  57     }
  58
  59   if (HP_TIMING_AVAIL)
  60     {
  61       hp_timing_t start __attribute ((unused));
  62       hp_timing_t stop __attribute ((unused));
  63       hp_timing_t best_time = ~ (hp_timing_t) 0;
  64       size_t i;
  65
  66       for (i = 0; i < 32; ++i)
  67         {
  68           dst[k] = '\0';
  69           HP_TIMING_NOW (start);
  70           CALL (impl, dst, src);
  71           HP_TIMING_NOW (stop);
  72           HP_TIMING_BEST (best_time, start, stop);
  73         }
  74
  75       printf ("\t%zd", (size_t) best_time);
  76     }
  77 }
  78
  79 static void
  80 do_test (size_t align1, size_t align2, size_t len1, size_t len2, int max_char)
  81 {
  82   size_t i;
  83   char *s1, *s2;
  84
  85   align1 &= 7;
  86   if (align1 + len1 >= page_size)
  87     return;
  88
  89   align2 &= 7;
  90   if (align2 + len1 + len2 >= page_size)
  91     return;
  92
  93   s1 = (char *) (buf1 + align1);
  94   s2 = (char *) (buf2 + align2);
  95
  96   for (i = 0; i < len1; ++i)
  97     s1[i] = 32 + 23 * i % (max_char - 32);
  98   s1[len1] = '\0';
  99
 100   for (i = 0; i < len2; i++)
 101     s2[i] = 32 + 23 * i % (max_char - 32);
 102
 103   if (HP_TIMING_AVAIL)
 104     printf ("Length %4zd/%4zd, alignment %2zd/%2zd:", len1, len2, align1, align2);
 105
 106   FOR_EACH_IMPL (impl, 0)
 107     {
 108       s2[len2] = '\0';
 109       do_one_test (impl, s2, s1);
 110     }
 111
 112   if (HP_TIMING_AVAIL)
 113     putchar ('\n');
 114 }
 115
 116 int
 117 test_main (void)
 118 {
 119   size_t i;
 120
 121   test_init ();
 122
 123   printf ("%28s", "");
 124   FOR_EACH_IMPL (impl, 0)
 125     printf ("\t%s", impl->name);
 126   putchar ('\n');
 127
 128   for (i = 0; i < 16; ++i)
 129     {
 130       do_test (0, 0, i, i, 127);
 131       do_test (0, 0, i, i, 255);
 132       do_test (0, i, i, i, 127);
 133       do_test (i, 0, i, i, 255);
 134     }
 135
 136   for (i = 1; i < 8; ++i)
 137     {
 138       do_test (0, 0, 8 << i, 8 << i, 127);
 139       do_test (8 - i, 2 * i, 8 << i, 8 << i, 127);
 140       do_test (0, 0, 8 << i, 2 << i, 127);
 141       do_test (8 - i, 2 * i, 8 << i, 2 << i, 127);
 142     }
 143
 144   for (i = 1; i < 8; ++i)
 145     {
 146       do_test (i, 2 * i, 8 << i, 1, 127);
 147       do_test (2 * i, i, 8 << i, 1, 255);
 148       do_test (i, i, 8 << i, 10, 127);
 149       do_test (i, i, 8 << i, 10, 255);
 150     }
 151
 152   return ret;
 153 }
 154
 155 #include "../test-skeleton.c"