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