benchtests/bench-strpbrk.c

   1 /* Measure strpbrk 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 #ifndef STRPBRK_RESULT
  20 # define STRPBRK_RESULT(s, pos) ((s)[(pos)] ? (s) + (pos) : NULL)
  21 # define RES_TYPE char *
  22 # define TEST_MAIN
  23 # define TEST_NAME "strpbrk"
  24 # include "bench-string.h"
  25
  26 typedef char *(*proto_t) (const char *, const char *);
  27 char *simple_strpbrk (const char *, const char *);
  28 char *stupid_strpbrk (const char *, const char *);
  29
  30 IMPL (stupid_strpbrk, 0)
  31 IMPL (simple_strpbrk, 0)
  32 IMPL (strpbrk, 1)
  33
  34 char *
  35 simple_strpbrk (const char *s, const char *rej)
  36 {
  37   const char *r;
  38   char c;
  39
  40   while ((c = *s++) != '\0')
  41     for (r = rej; *r != '\0'; ++r)
  42       if (*r == c)
  43         return (char *) s - 1;
  44   return NULL;
  45 }
  46
  47 char *
  48 stupid_strpbrk (const char *s, const char *rej)
  49 {
  50   size_t ns = strlen (s), nrej = strlen (rej);
  51   size_t i, j;
  52
  53   for (i = 0; i < ns; ++i)
  54     for (j = 0; j < nrej; ++j)
  55       if (s[i] == rej[j])
  56         return (char *) s + i;
  57   return NULL;
  58 }
  59 #endif
  60
  61 static void
  62 do_one_test (impl_t *impl, const char *s, const char *rej, RES_TYPE exp_res)
  63 {
  64   RES_TYPE res = CALL (impl, s, rej);
  65   size_t i, iters = INNER_LOOP_ITERS;
  66   timing_t start, stop, cur;
  67
  68   if (res != exp_res)
  69     {
  70       error (0, 0, "Wrong result in function %s %p %p", impl->name,
  71              (void *) res, (void *) exp_res);
  72       ret = 1;
  73       return;
  74     }
  75
  76   TIMING_NOW (start);
  77   for (i = 0; i < iters; ++i)
  78     {
  79       CALL (impl, s, rej);
  80     }
  81   TIMING_NOW (stop);
  82
  83   TIMING_DIFF (cur, start, stop);
  84
  85   TIMING_PRINT_MEAN ((double) cur, (double) iters);
  86 }
  87
  88 static void
  89 do_test (size_t align, size_t pos, size_t len)
  90 {
  91   size_t i;
  92   int c;
  93   RES_TYPE result;
  94   char *rej, *s;
  95
  96   align &= 7;
  97   if (align + pos + 10 >= page_size || len > 240)
  98     return;
  99
 100   rej = (char *) (buf2 + (random () & 255));
 101   s = (char *) (buf1 + align);
 102
 103   for (i = 0; i < len; ++i)
 104     {
 105       rej[i] = random () & 255;
 106       if (!rej[i])
 107         rej[i] = random () & 255;
 108       if (!rej[i])
 109         rej[i] = 1 + (random () & 127);
 110     }
 111   rej[len] = '\0';
 112   for (c = 1; c <= 255; ++c)
 113     if (strchr (rej, c) == NULL)
 114       break;
 115
 116   for (i = 0; i < pos; ++i)
 117     {
 118       s[i] = random () & 255;
 119       if (strchr (rej, s[i]))
 120         {
 121           s[i] = random () & 255;
 122           if (strchr (rej, s[i]))
 123             s[i] = c;
 124         }
 125     }
 126   s[pos] = rej[random () % (len + 1)];
 127   if (s[pos])
 128     {
 129       for (i = pos + 1; i < pos + 10; ++i)
 130         s[i] = random () & 255;
 131       s[i] = '\0';
 132     }
 133   result = STRPBRK_RESULT (s, pos);
 134
 135   printf ("Length %4zd, alignment %2zd, rej len %2zd:", pos, align, len);
 136
 137   FOR_EACH_IMPL (impl, 0)
 138     do_one_test (impl, s, rej, result);
 139
 140   putchar ('\n');
 141 }
 142
 143 int
 144 test_main (void)
 145 {
 146   size_t i;
 147
 148   test_init ();
 149
 150   printf ("%32s", "");
 151   FOR_EACH_IMPL (impl, 0)
 152     printf ("\t%s", impl->name);
 153   putchar ('\n');
 154
 155   for (i = 0; i < 32; ++i)
 156     {
 157       do_test (0, 512, i);
 158       do_test (i, 512, i);
 159     }
 160
 161   for (i = 1; i < 8; ++i)
 162     {
 163       do_test (0, 16 << i, 4);
 164       do_test (i, 16 << i, 4);
 165     }
 166
 167   for (i = 1; i < 8; ++i)
 168     do_test (i, 64, 10);
 169
 170   for (i = 0; i < 64; ++i)
 171     do_test (0, i, 6);
 172
 173   return ret;
 174 }
 175
 176 #include "../test-skeleton.c"