benchtests/bench-strnlen.c

   1 /* Measure strlen 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 #ifndef WIDE
  21 # define TEST_NAME "strnlen"
  22 #else
  23 # define TEST_NAME "wcsnlen"
  24 #endif /* WIDE */
  25 #include "bench-string.h"
  26
  27 #ifndef WIDE
  28 # define STRNLEN strnlen
  29 # define CHAR char
  30 # define BIG_CHAR CHAR_MAX
  31 # define MIDDLE_CHAR 127
  32 # define SIMPLE_STRNLEN simple_strnlen
  33 #else
  34 # include <wchar.h>
  35 # define STRNLEN wcsnlen
  36 # define CHAR wchar_t
  37 # define BIG_CHAR WCHAR_MAX
  38 # define MIDDLE_CHAR 1121
  39 # define SIMPLE_STRNLEN simple_wcsnlen
  40 #endif /* WIDE */
  41
  42 typedef size_t (*proto_t) (const CHAR *, size_t);
  43 size_t SIMPLE_STRNLEN (const CHAR *, size_t);
  44
  45 IMPL (SIMPLE_STRNLEN, 0)
  46 IMPL (STRNLEN, 1)
  47
  48 size_t
  49 SIMPLE_STRNLEN (const CHAR *s, size_t maxlen)
  50 {
  51   size_t i;
  52
  53   for (i = 0; i < maxlen && s[i]; ++i);
  54   return i;
  55 }
  56
  57 static void
  58 do_one_test (impl_t *impl, const CHAR *s, size_t maxlen, size_t exp_len)
  59 {
  60   size_t len = CALL (impl, s, maxlen), i, iters = INNER_LOOP_ITERS;
  61   timing_t start, stop, cur;
  62
  63   if (len != exp_len)
  64     {
  65       error (0, 0, "Wrong result in function %s %zd %zd", impl->name,
  66              len, exp_len);
  67       ret = 1;
  68       return;
  69     }
  70
  71   TIMING_NOW (start);
  72   for (i = 0; i < iters; ++i)
  73     {
  74       CALL (impl, s, maxlen);
  75     }
  76   TIMING_NOW (stop);
  77
  78   TIMING_DIFF (cur, start, stop);
  79
  80   TIMING_PRINT_MEAN ((double) cur, (double) iters);
  81 }
  82
  83 static void
  84 do_test (size_t align, size_t len, size_t maxlen, int max_char)
  85 {
  86   size_t i;
  87
  88   align &= 63;
  89   if ((align + len) * sizeof (CHAR) >= page_size)
  90     return;
  91
  92   CHAR *buf = (CHAR *) (buf1);
  93
  94   for (i = 0; i < len; ++i)
  95     buf[align + i] = 1 + 7 * i % max_char;
  96   buf[align + len] = 0;
  97
  98   printf ("Length %4zd, alignment %2zd:", len, align);
  99
 100   FOR_EACH_IMPL (impl, 0)
 101     do_one_test (impl, (CHAR *) (buf + align), maxlen, MIN (len, maxlen));
 102
 103   putchar ('\n');
 104 }
 105
 106 int
 107 test_main (void)
 108 {
 109   size_t i;
 110
 111   test_init ();
 112
 113   printf ("%20s", "");
 114   FOR_EACH_IMPL (impl, 0)
 115     printf ("\t%s", impl->name);
 116   putchar ('\n');
 117
 118   for (i = 1; i < 8; ++i)
 119     {
 120       do_test (0, i, i - 1, MIDDLE_CHAR);
 121       do_test (0, i, i, MIDDLE_CHAR);
 122       do_test (0, i, i + 1, MIDDLE_CHAR);
 123     }
 124
 125   for (i = 1; i < 8; ++i)
 126     {
 127       do_test (i, i, i - 1, MIDDLE_CHAR);
 128       do_test (i, i, i, MIDDLE_CHAR);
 129       do_test (i, i, i + 1, MIDDLE_CHAR);
 130     }
 131
 132   for (i = 2; i <= 10; ++i)
 133     {
 134       do_test (0, 1 << i, 5000, MIDDLE_CHAR);
 135       do_test (1, 1 << i, 5000, MIDDLE_CHAR);
 136     }
 137
 138   for (i = 1; i < 8; ++i)
 139     do_test (0, i, 5000, BIG_CHAR);
 140
 141   for (i = 1; i < 8; ++i)
 142     do_test (i, i, 5000, BIG_CHAR);
 143
 144   for (i = 2; i <= 10; ++i)
 145     {
 146       do_test (0, 1 << i, 5000, BIG_CHAR);
 147       do_test (1, 1 << i, 5000, BIG_CHAR);
 148     }
 149
 150   return ret;
 151 }
 152
 153 #include <support/test-driver.c>