benchtests/bench-strstr.c

   1 /* Measure strstr functions.
   2    Copyright (C) 2013-2018 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 "strstr"
  21 #include "bench-string.h"
  22
  23
  24 #define STRSTR simple_strstr
  25 #define libc_hidden_builtin_def(X)
  26 #define __strnlen strnlen
  27 #include "../string/strstr.c"
  28
  29
  30 static char *
  31 stupid_strstr (const char *s1, const char *s2)
  32 {
  33   ssize_t s1len = strlen (s1);
  34   ssize_t s2len = strlen (s2);
  35
  36   if (s2len > s1len)
  37     return NULL;
  38
  39   for (ssize_t i = 0; i <= s1len - s2len; ++i)
  40     {
  41       size_t j;
  42       for (j = 0; j < s2len; ++j)
  43         if (s1[i + j] != s2[j])
  44           break;
  45       if (j == s2len)
  46         return (char *) s1 + i;
  47     }
  48
  49   return NULL;
  50 }
  51
  52
  53 typedef char *(*proto_t) (const char *, const char *);
  54
  55 IMPL (stupid_strstr, 0)
  56 IMPL (simple_strstr, 0)
  57 IMPL (strstr, 1)
  58
  59
  60 static void
  61 do_one_test (impl_t *impl, const char *s1, const char *s2, char *exp_result)
  62 {
  63   size_t i, iters = INNER_LOOP_ITERS;
  64   timing_t start, stop, cur;
  65
  66   TIMING_NOW (start);
  67   for (i = 0; i < iters; ++i)
  68     {
  69       CALL (impl, s1, s2);
  70     }
  71   TIMING_NOW (stop);
  72
  73   TIMING_DIFF (cur, start, stop);
  74
  75   TIMING_PRINT_MEAN ((double) cur, (double) iters);
  76 }
  77
  78
  79 static void
  80 do_test (size_t align1, size_t align2, size_t len1, size_t len2,
  81          int fail)
  82 {
  83   char *s1 = (char *) (buf1 + align1);
  84   char *s2 = (char *) (buf2 + align2);
  85
  86   static const char d[] = "1234567890abcdef";
  87 #define dl (sizeof (d) - 1)
  88   char *ss2 = s2;
  89   for (size_t l = len2; l > 0; l = l > dl ? l - dl : 0)
  90     {
  91       size_t t = l > dl ? dl : l;
  92       ss2 = mempcpy (ss2, d, t);
  93     }
  94   s2[len2] = '\0';
  95
  96   if (fail)
  97     {
  98       char *ss1 = s1;
  99       for (size_t l = len1; l > 0; l = l > dl ? l - dl : 0)
 100         {
 101           size_t t = l > dl ? dl : l;
 102           memcpy (ss1, d, t);
 103           ++ss1[len2 > 7 ? 7 : len2 - 1];
 104           ss1 += t;
 105         }
 106     }
 107   else
 108     {
 109       memset (s1, '0', len1);
 110       memcpy (s1 + len1 - len2, s2, len2);
 111     }
 112   s1[len1] = '\0';
 113
 114   printf ("Length %4zd/%zd, alignment %2zd/%2zd, %s:",
 115           len1, len2, align1, align2, fail ? "fail" : "found");
 116
 117   FOR_EACH_IMPL (impl, 0)
 118     do_one_test (impl, s1, s2, fail ? NULL : s1 + len1 - len2);
 119
 120   putchar ('\n');
 121 }
 122
 123 static int
 124 test_main (void)
 125 {
 126   test_init ();
 127
 128   printf ("%23s", "");
 129   FOR_EACH_IMPL (impl, 0)
 130     printf ("\t%s", impl->name);
 131   putchar ('\n');
 132
 133   for (size_t klen = 2; klen < 32; ++klen)
 134     for (size_t hlen = 2 * klen; hlen < 16 * klen; hlen += klen)
 135       {
 136         do_test (0, 0, hlen, klen, 0);
 137         do_test (0, 0, hlen, klen, 1);
 138         do_test (0, 3, hlen, klen, 0);
 139         do_test (0, 3, hlen, klen, 1);
 140         do_test (0, 9, hlen, klen, 0);
 141         do_test (0, 9, hlen, klen, 1);
 142         do_test (0, 15, hlen, klen, 0);
 143         do_test (0, 15, hlen, klen, 1);
 144
 145         do_test (3, 0, hlen, klen, 0);
 146         do_test (3, 0, hlen, klen, 1);
 147         do_test (3, 3, hlen, klen, 0);
 148         do_test (3, 3, hlen, klen, 1);
 149         do_test (3, 9, hlen, klen, 0);
 150         do_test (3, 9, hlen, klen, 1);
 151         do_test (3, 15, hlen, klen, 0);
 152         do_test (3, 15, hlen, klen, 1);
 153
 154         do_test (9, 0, hlen, klen, 0);
 155         do_test (9, 0, hlen, klen, 1);
 156         do_test (9, 3, hlen, klen, 0);
 157         do_test (9, 3, hlen, klen, 1);
 158         do_test (9, 9, hlen, klen, 0);
 159         do_test (9, 9, hlen, klen, 1);
 160         do_test (9, 15, hlen, klen, 0);
 161         do_test (9, 15, hlen, klen, 1);
 162
 163         do_test (15, 0, hlen, klen, 0);
 164         do_test (15, 0, hlen, klen, 1);
 165         do_test (15, 3, hlen, klen, 0);
 166         do_test (15, 3, hlen, klen, 1);
 167         do_test (15, 9, hlen, klen, 0);
 168         do_test (15, 9, hlen, klen, 1);
 169         do_test (15, 15, hlen, klen, 0);
 170         do_test (15, 15, hlen, klen, 1);
 171       }
 172
 173   do_test (0, 0, page_size - 1, 16, 0);
 174   do_test (0, 0, page_size - 1, 16, 1);
 175
 176   return ret;
 177 }
 178
 179 #include <support/test-driver.c>