benchtests/bench-strcasecmp.c

   1 /* Measure strcasecmp functions.
   2    Copyright (C) 2013-2022 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    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <ctype.h>
  20 #define TEST_MAIN
  21 #define TEST_NAME "strcasecmp"
  22 #include "bench-string.h"
  23
  24 typedef int (*proto_t) (const char *, const char *);
  25 static int simple_strcasecmp (const char *, const char *);
  26
  27 IMPL (simple_strcasecmp, 0)
  28 IMPL (strcasecmp, 1)
  29
  30 static int
  31 simple_strcasecmp (const char *s1, const char *s2)
  32 {
  33   int ret;
  34
  35   while ((ret = ((unsigned char) tolower (*s1)
  36                  - (unsigned char) tolower (*s2))) == 0
  37          && *s1++)
  38     ++s2;
  39   return ret;
  40 }
  41
  42 static void
  43 do_one_test (impl_t *impl, const char *s1, const char *s2, int exp_result)
  44 {
  45   size_t i, iters = INNER_LOOP_ITERS;
  46   timing_t start, stop, cur;
  47   int result = CALL (impl, s1, s2);
  48   if ((exp_result == 0 && result != 0)
  49       || (exp_result < 0 && result >= 0)
  50       || (exp_result > 0 && result <= 0))
  51     {
  52       error (0, 0, "Wrong result in function %s %d %d", impl->name,
  53              result, exp_result);
  54       ret = 1;
  55       return;
  56     }
  57
  58   TIMING_NOW (start);
  59   for (i = 0; i < iters; ++i)
  60     {
  61       CALL (impl, s1, s2);
  62     }
  63   TIMING_NOW (stop);
  64
  65   TIMING_DIFF (cur, start, stop);
  66
  67   TIMING_PRINT_MEAN ((double) cur, (double) iters);
  68 }
  69
  70 static void
  71 do_test (size_t align1, size_t align2, size_t len, int max_char,
  72          int exp_result)
  73 {
  74   size_t i;
  75   char *s1, *s2;
  76
  77   if (len == 0)
  78     return;
  79
  80   align1 &= 7;
  81   if (align1 + len + 1 >= page_size)
  82     return;
  83
  84   align2 &= 7;
  85   if (align2 + len + 1 >= page_size)
  86     return;
  87
  88   s1 = (char *) (buf1 + align1);
  89   s2 = (char *) (buf2 + align2);
  90
  91   for (i = 0; i < len; i++)
  92     {
  93       s1[i] = toupper (1 + 23 * i % max_char);
  94       s2[i] = tolower (s1[i]);
  95     }
  96
  97   s1[len] = s2[len] = 0;
  98   s1[len + 1] = 23;
  99   s2[len + 1] = 24 + exp_result;
 100   if ((s2[len - 1] == 'z' && exp_result == -1)
 101       || (s2[len - 1] == 'a' && exp_result == 1))
 102     s1[len - 1] += exp_result;
 103   else
 104     s2[len - 1] -= exp_result;
 105
 106   printf ("Length %4zd, alignment %2zd/%2zd:", len, align1, align2);
 107
 108   FOR_EACH_IMPL (impl, 0)
 109     do_one_test (impl, s1, s2, exp_result);
 110
 111   putchar ('\n');
 112 }
 113
 114 int
 115 test_main (void)
 116 {
 117   size_t i;
 118
 119   test_init ();
 120
 121   printf ("%23s", "");
 122   FOR_EACH_IMPL (impl, 0)
 123     printf ("\t%s", impl->name);
 124   putchar ('\n');
 125
 126   for (i = 1; i < 16; ++i)
 127     {
 128       do_test (i, i, i, 127, 0);
 129       do_test (i, i, i, 127, 1);
 130       do_test (i, i, i, 127, -1);
 131     }
 132
 133   for (i = 1; i < 10; ++i)
 134     {
 135       do_test (0, 0, 2 << i, 127, 0);
 136       do_test (0, 0, 2 << i, 254, 0);
 137       do_test (0, 0, 2 << i, 127, 1);
 138       do_test (0, 0, 2 << i, 254, 1);
 139       do_test (0, 0, 2 << i, 127, -1);
 140       do_test (0, 0, 2 << i, 254, -1);
 141     }
 142
 143   for (i = 1; i < 8; ++i)
 144     {
 145       do_test (i, 2 * i, 8 << i, 127, 0);
 146       do_test (2 * i, i, 8 << i, 254, 0);
 147       do_test (i, 2 * i, 8 << i, 127, 1);
 148       do_test (2 * i, i, 8 << i, 254, 1);
 149       do_test (i, 2 * i, 8 << i, 127, -1);
 150       do_test (2 * i, i, 8 << i, 254, -1);
 151     }
 152
 153   return ret;
 154 }
 155
 156 #include <support/test-driver.c>