benchtests/bench-strrchr.c

   1 /* Measure STRCHR 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 #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 #ifdef WIDE
  28 # include <wchar.h>
  29 # define SIMPLE_STRRCHR simple_wcsrchr
  30 # define STRRCHR wcsrchr
  31 # define CHAR wchar_t
  32 # define UCHAR wchar_t
  33 # define BIG_CHAR WCHAR_MAX
  34 # define SMALL_CHAR 1273
  35 #else
  36 # define SIMPLE_STRRCHR simple_strrchr
  37 # define STRRCHR strrchr
  38 # define CHAR char
  39 # define UCHAR unsigned char
  40 # define BIG_CHAR CHAR_MAX
  41 # define SMALL_CHAR 127
  42 #endif
  43
  44 typedef CHAR *(*proto_t) (const CHAR *, int);
  45 CHAR *SIMPLE_STRRCHR (const CHAR *, int);
  46
  47 IMPL (SIMPLE_STRRCHR, 0)
  48 IMPL (STRRCHR, 1)
  49
  50 CHAR *
  51 SIMPLE_STRRCHR (const CHAR *s, int c)
  52 {
  53   const CHAR *ret = NULL;
  54
  55   for (; *s != '\0'; ++s)
  56     if (*s == (CHAR) c)
  57       ret = s;
  58
  59   return (CHAR *) (c == '\0' ? s : ret);
  60 }
  61
  62 static void
  63 do_one_test (impl_t *impl, const CHAR *s, int c, CHAR *exp_res)
  64 {
  65   CHAR *res = CALL (impl, s, c);
  66   size_t i, iters = INNER_LOOP_ITERS;
  67   timing_t start, stop, cur;
  68
  69   if (res != exp_res)
  70     {
  71       error (0, 0, "Wrong result in function %s %p %p", impl->name,
  72              res, exp_res);
  73       ret = 1;
  74       return;
  75     }
  76
  77   TIMING_NOW (start);
  78   for (i = 0; i < iters; ++i)
  79     {
  80       CALL (impl, s, c);
  81     }
  82   TIMING_NOW (stop);
  83
  84   TIMING_DIFF (cur, start, stop);
  85
  86   TIMING_PRINT_MEAN ((double) cur, (double) iters);
  87 }
  88
  89 static void
  90 do_test (size_t align, size_t pos, size_t len, int seek_char, int max_char)
  91 /* For wcsrchr: align here means align not in bytes,
  92    but in wchar_ts, in bytes it will equal to align * (sizeof (wchar_t))
  93    len for wcschr here isn't in bytes but it's number of wchar_t symbols.  */
  94 {
  95   size_t i;
  96   CHAR *result;
  97   CHAR *buf = (CHAR *) buf1;
  98
  99   align &= 7;
 100   if ((align + len) * sizeof (CHAR) >= page_size)
 101     return;
 102
 103   for (i = 0; i < len; ++i)
 104     {
 105       buf[align + i] = (random () * random ()) & max_char;
 106       if (!buf[align + i])
 107         buf[align + i] = (random () * random ()) & max_char;
 108       if (!buf[align + i])
 109         buf[align + i] = 1;
 110       if ((i > pos || pos >= len) && buf[align + i] == seek_char)
 111         buf[align + i] = seek_char + 10 + (random () & 15);
 112     }
 113   buf[align + len] = 0;
 114
 115   if (pos < len)
 116     {
 117       buf[align + pos] = seek_char;
 118       result = (CHAR *) (buf + align + pos);
 119     }
 120   else if (seek_char == 0)
 121     result = (CHAR *) (buf + align + len);
 122   else
 123     result = NULL;
 124
 125   printf ("Length %4zd, alignment in bytes %2zd:", len, align * sizeof (CHAR));
 126
 127   FOR_EACH_IMPL (impl, 0)
 128     do_one_test (impl, (CHAR *) (buf + align), seek_char, result);
 129
 130   putchar ('\n');
 131 }
 132
 133 int
 134 test_main (void)
 135 {
 136   size_t i;
 137
 138   test_init ();
 139
 140   printf ("%20s", "");
 141   FOR_EACH_IMPL (impl, 0)
 142     printf ("\t%s", impl->name);
 143   putchar ('\n');
 144
 145   for (i = 1; i < 8; ++i)
 146     {
 147       do_test (0, 16 << i, 2048, 23, SMALL_CHAR);
 148       do_test (i, 16 << i, 2048, 23, SMALL_CHAR);
 149     }
 150
 151   for (i = 1; i < 8; ++i)
 152     {
 153       do_test (i, 64, 256, 23, SMALL_CHAR);
 154       do_test (i, 64, 256, 23, BIG_CHAR);
 155     }
 156
 157   for (i = 0; i < 32; ++i)
 158     {
 159       do_test (0, i, i + 1, 23, SMALL_CHAR);
 160       do_test (0, i, i + 1, 23, BIG_CHAR);
 161     }
 162
 163   for (i = 1; i < 8; ++i)
 164     {
 165       do_test (0, 16 << i, 2048, 0, SMALL_CHAR);
 166       do_test (i, 16 << i, 2048, 0, SMALL_CHAR);
 167     }
 168
 169   for (i = 1; i < 8; ++i)
 170     {
 171       do_test (i, 64, 256, 0, SMALL_CHAR);
 172       do_test (i, 64, 256, 0, BIG_CHAR);
 173     }
 174
 175   for (i = 0; i < 32; ++i)
 176     {
 177       do_test (0, i, i + 1, 0, SMALL_CHAR);
 178       do_test (0, i, i + 1, 0, BIG_CHAR);
 179     }
 180
 181   return ret;
 182 }
 183
 184 #include <support/test-driver.c>