benchtests/bench-strncasecmp.c

   1 /* Measure strncasecmp functions.
   2    Copyright (C) 2013-2017 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 #include <ctype.h>
  20 #define TEST_MAIN
  21 #define TEST_NAME "strncasecmp"
  22 #include "bench-string.h"
  23
  24 typedef int (*proto_t) (const char *, const char *, size_t);
  25 static int simple_strncasecmp (const char *, const char *, size_t);
  26 static int stupid_strncasecmp (const char *, const char *, size_t);
  27
  28 IMPL (stupid_strncasecmp, 0)
  29 IMPL (simple_strncasecmp, 0)
  30 IMPL (strncasecmp, 1)
  31
  32 static int
  33 simple_strncasecmp (const char *s1, const char *s2, size_t n)
  34 {
  35   int ret;
  36
  37   if (n == 0)
  38     return 0;
  39
  40   while ((ret = ((unsigned char) tolower (*s1)
  41                  - (unsigned char) tolower (*s2))) == 0
  42          && *s1++)
  43     {
  44       if (--n == 0)
  45         return 0;
  46       ++s2;
  47     }
  48   return ret;
  49 }
  50
  51 static int
  52 stupid_strncasecmp (const char *s1, const char *s2, size_t max)
  53 {
  54   size_t ns1 = strlen (s1) + 1;
  55   size_t ns2 = strlen (s2) + 1;
  56   size_t n = ns1 < ns2 ? ns1 : ns2;
  57   if (n > max)
  58     n = max;
  59   int ret = 0;
  60
  61   while (n--)
  62     {
  63       if ((ret = ((unsigned char) tolower (*s1)
  64                   - (unsigned char) tolower (*s2))) != 0)
  65         break;
  66       ++s1;
  67       ++s2;
  68     }
  69   return ret;
  70 }
  71
  72 static void
  73 do_one_test (impl_t *impl, const char *s1, const char *s2, size_t n,
  74              int exp_result)
  75 {
  76   size_t i, iters = INNER_LOOP_ITERS;
  77   timing_t start, stop, cur;
  78
  79   TIMING_NOW (start);
  80   for (i = 0; i < iters; ++i)
  81     {
  82       CALL (impl, s1, s2, n);
  83     }
  84   TIMING_NOW (stop);
  85
  86   TIMING_DIFF (cur, start, stop);
  87
  88   TIMING_PRINT_MEAN ((double) cur, (double) iters);
  89 }
  90
  91 static void
  92 do_test (size_t align1, size_t align2, size_t n, size_t len, int max_char,
  93          int exp_result)
  94 {
  95   size_t i;
  96   char *s1, *s2;
  97
  98   if (len == 0)
  99     return;
 100
 101   align1 &= 7;
 102   if (align1 + len + 1 >= page_size)
 103     return;
 104
 105   align2 &= 7;
 106   if (align2 + len + 1 >= page_size)
 107     return;
 108
 109   s1 = (char *) (buf1 + align1);
 110   s2 = (char *) (buf2 + align2);
 111
 112   for (i = 0; i < len; i++)
 113     {
 114       s1[i] = toupper (1 + 23 * i % max_char);
 115       s2[i] = tolower (s1[i]);
 116     }
 117
 118   s1[len] = s2[len] = 0;
 119   s1[len + 1] = 23;
 120   s2[len + 1] = 24 + exp_result;
 121   if ((s2[len - 1] == 'z' && exp_result == -1)
 122       || (s2[len - 1] == 'a' && exp_result == 1))
 123     s1[len - 1] += exp_result;
 124   else
 125     s2[len - 1] -= exp_result;
 126
 127   printf ("Length %4zd, alignment %2zd/%2zd:", len, align1, align2);
 128
 129   FOR_EACH_IMPL (impl, 0)
 130     do_one_test (impl, s1, s2, n, exp_result);
 131
 132   putchar ('\n');
 133 }
 134
 135 int
 136 test_main (void)
 137 {
 138   size_t i;
 139
 140   test_init ();
 141
 142   printf ("%23s", "");
 143   FOR_EACH_IMPL (impl, 0)
 144     printf ("\t%s", impl->name);
 145   putchar ('\n');
 146
 147   for (i = 1; i < 16; ++i)
 148     {
 149       do_test (i, i, i - 1, i, 127, 0);
 150
 151       do_test (i, i, i, i, 127, 0);
 152       do_test (i, i, i, i, 127, 1);
 153       do_test (i, i, i, i, 127, -1);
 154
 155       do_test (i, i, i + 1, i, 127, 0);
 156       do_test (i, i, i + 1, i, 127, 1);
 157       do_test (i, i, i + 1, i, 127, -1);
 158     }
 159
 160   for (i = 1; i < 10; ++i)
 161     {
 162       do_test (0, 0, (2 << i) - 1, 2 << i, 127, 0);
 163       do_test (0, 0, 2 << i, 2 << i, 254, 0);
 164       do_test (0, 0, (2 << i) + 1, 2 << i, 127, 0);
 165
 166       do_test (0, 0, (2 << i) + 1, 2 << i, 254, 0);
 167
 168       do_test (0, 0, 2 << i, 2 << i, 127, 1);
 169       do_test (0, 0, (2 << i) + 10, 2 << i, 127, 1);
 170
 171       do_test (0, 0, 2 << i, 2 << i, 254, 1);
 172       do_test (0, 0, (2 << i) + 10, 2 << i, 254, 1);
 173
 174       do_test (0, 0, 2 << i, 2 << i, 127, -1);
 175       do_test (0, 0, (2 << i) + 10, 2 << i, 127, -1);
 176
 177       do_test (0, 0, 2 << i, 2 << i, 254, -1);
 178       do_test (0, 0, (2 << i) + 10, 2 << i, 254, -1);
 179     }
 180
 181   for (i = 1; i < 8; ++i)
 182     {
 183       do_test (i, 2 * i, (8 << i) - 1, 8 << i, 127, 0);
 184       do_test (i, 2 * i, 8 << i, 8 << i, 127, 0);
 185       do_test (i, 2 * i, (8 << i) + 100, 8 << i, 127, 0);
 186
 187       do_test (2 * i, i, (8 << i) - 1, 8 << i, 254, 0);
 188       do_test (2 * i, i, 8 << i, 8 << i, 254, 0);
 189       do_test (2 * i, i, (8 << i) + 100, 8 << i, 254, 0);
 190
 191       do_test (i, 2 * i, 8 << i, 8 << i, 127, 1);
 192       do_test (i, 2 * i, (8 << i) + 100, 8 << i, 127, 1);
 193
 194       do_test (2 * i, i, 8 << i, 8 << i, 254, 1);
 195       do_test (2 * i, i, (8 << i) + 100, 8 << i, 254, 1);
 196
 197       do_test (i, 2 * i, 8 << i, 8 << i, 127, -1);
 198       do_test (i, 2 * i, (8 << i) + 100, 8 << i, 127, -1);
 199
 200       do_test (2 * i, i, 8 << i, 8 << i, 254, -1);
 201       do_test (2 * i, i, (8 << i) + 100, 8 << i, 254, -1);
 202     }
 203
 204   return ret;
 205 }
 206
 207 #include <support/test-driver.c>