benchtests/bench-strnlen.c

   1 /* Measure strlen functions.
   2    Copyright (C) 2013-2021 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 #ifndef WIDE
  21 # define TEST_NAME "strnlen"
  22 #else
  23 # define TEST_NAME "wcsnlen"
  24 # define generic_strnlen generic_wcsnlen
  25 # define memchr_strnlen wcschr_wcsnlen
  26 #endif /* WIDE */
  27 #include "bench-string.h"
  28
  29 #define BIG_CHAR MAX_CHAR
  30
  31 #ifndef WIDE
  32 # define MIDDLE_CHAR 127
  33 #else
  34 # define MIDDLE_CHAR 1121
  35 #endif /* WIDE */
  36
  37 typedef size_t (*proto_t) (const CHAR *, size_t);
  38 size_t generic_strnlen (const CHAR *, size_t);
  39
  40 size_t
  41 memchr_strnlen (const CHAR *s, size_t maxlen)
  42 {
  43   const CHAR *s1 = MEMCHR (s, 0, maxlen);
  44   return (s1 == NULL) ? maxlen : s1 - s;
  45 }
  46
  47 IMPL (STRNLEN, 1)
  48 IMPL (memchr_strnlen, 0)
  49 IMPL (generic_strnlen, 0)
  50
  51 static void
  52 do_one_test (impl_t *impl, const CHAR *s, size_t maxlen, size_t exp_len)
  53 {
  54   size_t len = CALL (impl, s, maxlen), i, iters = INNER_LOOP_ITERS_LARGE;
  55   timing_t start, stop, cur;
  56
  57   if (len != exp_len)
  58     {
  59       error (0, 0, "Wrong result in function %s %zd %zd", impl->name,
  60              len, exp_len);
  61       ret = 1;
  62       return;
  63     }
  64
  65   TIMING_NOW (start);
  66   for (i = 0; i < iters; ++i)
  67     {
  68       CALL (impl, s, maxlen);
  69     }
  70   TIMING_NOW (stop);
  71
  72   TIMING_DIFF (cur, start, stop);
  73
  74   TIMING_PRINT_MEAN ((double) cur, (double) iters);
  75 }
  76
  77 static void
  78 do_test (size_t align, size_t len, size_t maxlen, int max_char)
  79 {
  80   size_t i;
  81
  82   align &= 63;
  83   if ((align + len) * sizeof (CHAR) >= page_size)
  84     return;
  85
  86   CHAR *buf = (CHAR *) (buf1);
  87
  88   for (i = 0; i < len; ++i)
  89     buf[align + i] = 1 + 7 * i % max_char;
  90   buf[align + len] = 0;
  91
  92   printf ("Length %4zd, alignment %2zd:", len, align);
  93
  94   FOR_EACH_IMPL (impl, 0)
  95     do_one_test (impl, (CHAR *) (buf + align), maxlen, MIN (len, maxlen));
  96
  97   putchar ('\n');
  98 }
  99
 100 int
 101 test_main (void)
 102 {
 103   size_t i;
 104
 105   test_init ();
 106
 107   printf ("%20s", "");
 108   FOR_EACH_IMPL (impl, 0)
 109     printf ("\t%s", impl->name);
 110   putchar ('\n');
 111
 112   for (i = 1; i < 8; ++i)
 113     {
 114       do_test (0, i, i - 1, MIDDLE_CHAR);
 115       do_test (0, i, i, MIDDLE_CHAR);
 116       do_test (0, i, i + 1, MIDDLE_CHAR);
 117     }
 118
 119   for (i = 1; i < 8; ++i)
 120     {
 121       do_test (i, i, i - 1, MIDDLE_CHAR);
 122       do_test (i, i, i, MIDDLE_CHAR);
 123       do_test (i, i, i + 1, MIDDLE_CHAR);
 124     }
 125
 126   for (i = 2; i <= 10; ++i)
 127     {
 128       do_test (0, 1 << i, 5000, MIDDLE_CHAR);
 129       do_test (1, 1 << i, 5000, MIDDLE_CHAR);
 130     }
 131
 132   for (i = 1; i < 8; ++i)
 133     do_test (0, i, 5000, BIG_CHAR);
 134
 135   for (i = 1; i < 8; ++i)
 136     do_test (i, i, 5000, BIG_CHAR);
 137
 138   for (i = 2; i <= 10; ++i)
 139     {
 140       do_test (0, 1 << i, 5000, BIG_CHAR);
 141       do_test (1, 1 << i, 5000, BIG_CHAR);
 142     }
 143
 144   return ret;
 145 }
 146
 147 #include <support/test-driver.c>
 148
 149 #define libc_hidden_def(X)
 150 #ifndef WIDE
 151 # undef STRNLEN
 152 # define STRNLEN generic_strnlen
 153 # include <string/strnlen.c>
 154 #else
 155 # define WCSNLEN generic_strnlen
 156 # include <wcsmbs/wcsnlen.c>
 157 #endif