benchtests/bench-strcasecmp.c

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