benchtests/bench-strrchr.c

   1 /* Measure STRCHR 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 #define TEST_MAIN
  20 #ifdef WIDE
  21 # define TEST_NAME "wcsrchr"
  22 #else
  23 # define TEST_NAME "strrchr"
  24 #endif
  25 #include "bench-string.h"
  26
  27 #define BIG_CHAR MAX_CHAR
  28
  29 #ifdef WIDE
  30 # define SIMPLE_STRRCHR simple_wcsrchr
  31 # define SMALL_CHAR 1273
  32 #else
  33 # define SIMPLE_STRRCHR simple_strrchr
  34 # define SMALL_CHAR 127
  35 #endif
  36
  37 typedef CHAR *(*proto_t) (const CHAR *, int);
  38 CHAR *SIMPLE_STRRCHR (const CHAR *, int);
  39
  40 IMPL (SIMPLE_STRRCHR, 0)
  41 IMPL (STRRCHR, 1)
  42
  43 CHAR *
  44 SIMPLE_STRRCHR (const CHAR *s, int c)
  45 {
  46   const CHAR *ret = NULL;
  47
  48   for (; *s != '\0'; ++s)
  49     if (*s == (CHAR) c)
  50       ret = s;
  51
  52   return (CHAR *) (c == '\0' ? s : ret);
  53 }
  54
  55 static void
  56 do_one_test (impl_t *impl, const CHAR *s, int c, CHAR *exp_res)
  57 {
  58   CHAR *res = CALL (impl, s, c);
  59   size_t i, iters = INNER_LOOP_ITERS8;
  60   timing_t start, stop, cur;
  61
  62   if (res != exp_res)
  63     {
  64       error (0, 0, "Wrong result in function %s %p %p", impl->name,
  65              res, exp_res);
  66       ret = 1;
  67       return;
  68     }
  69
  70   TIMING_NOW (start);
  71   for (i = 0; i < iters; ++i)
  72     {
  73       CALL (impl, s, c);
  74     }
  75   TIMING_NOW (stop);
  76
  77   TIMING_DIFF (cur, start, stop);
  78
  79   TIMING_PRINT_MEAN ((double) cur, (double) iters);
  80 }
  81
  82 static void
  83 do_test (size_t align, size_t pos, size_t len, int seek_char, int max_char)
  84 /* For wcsrchr: align here means align not in bytes,
  85    but in wchar_ts, in bytes it will equal to align * (sizeof (wchar_t))
  86    len for wcschr here isn't in bytes but it's number of wchar_t symbols.  */
  87 {
  88   size_t i;
  89   CHAR *result;
  90   CHAR *buf = (CHAR *) buf1;
  91
  92   align &= 7;
  93   if ((align + len) * sizeof (CHAR) >= page_size)
  94     return;
  95
  96   for (i = 0; i < len; ++i)
  97     {
  98       buf[align + i] = (random () * random ()) & max_char;
  99       if (!buf[align + i])
 100         buf[align + i] = (random () * random ()) & max_char;
 101       if (!buf[align + i])
 102         buf[align + i] = 1;
 103       if ((i > pos || pos >= len) && buf[align + i] == seek_char)
 104         buf[align + i] = seek_char + 10 + (random () & 15);
 105     }
 106   buf[align + len] = 0;
 107
 108   if (pos < len)
 109     {
 110       buf[align + pos] = seek_char;
 111       result = (CHAR *) (buf + align + pos);
 112     }
 113   else if (seek_char == 0)
 114     result = (CHAR *) (buf + align + len);
 115   else
 116     result = NULL;
 117
 118   printf ("Length %4zd, alignment in bytes %2zd:", len, align * sizeof (CHAR));
 119
 120   FOR_EACH_IMPL (impl, 0)
 121     do_one_test (impl, (CHAR *) (buf + align), seek_char, result);
 122
 123   putchar ('\n');
 124 }
 125
 126 int
 127 test_main (void)
 128 {
 129   size_t i;
 130
 131   test_init ();
 132
 133   printf ("%20s", "");
 134   FOR_EACH_IMPL (impl, 0)
 135     printf ("\t%s", impl->name);
 136   putchar ('\n');
 137
 138   for (i = 1; i < 8; ++i)
 139     {
 140       do_test (0, 16 << i, 2048, 23, SMALL_CHAR);
 141       do_test (i, 16 << i, 2048, 23, SMALL_CHAR);
 142     }
 143
 144   for (i = 1; i < 8; ++i)
 145     {
 146       do_test (i, 64, 256, 23, SMALL_CHAR);
 147       do_test (i, 64, 256, 23, BIG_CHAR);
 148     }
 149
 150   for (i = 0; i < 32; ++i)
 151     {
 152       do_test (0, i, i + 1, 23, SMALL_CHAR);
 153       do_test (0, i, i + 1, 23, BIG_CHAR);
 154     }
 155
 156   for (i = 1; i < 8; ++i)
 157     {
 158       do_test (0, 16 << i, 2048, 0, SMALL_CHAR);
 159       do_test (i, 16 << i, 2048, 0, SMALL_CHAR);
 160     }
 161
 162   for (i = 1; i < 8; ++i)
 163     {
 164       do_test (i, 64, 256, 0, SMALL_CHAR);
 165       do_test (i, 64, 256, 0, BIG_CHAR);
 166     }
 167
 168   for (i = 0; i < 32; ++i)
 169     {
 170       do_test (0, i, i + 1, 0, SMALL_CHAR);
 171       do_test (0, i, i + 1, 0, BIG_CHAR);
 172     }
 173
 174   return ret;
 175 }
 176
 177 #include <support/test-driver.c>