benchtests/bench-strnlen.c

   1 /* Measure strlen functions.
   2    Copyright (C) 2013-2015 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 #define TEST_NAME "strnlen"
  21 #include "bench-string.h"
  22
  23 typedef size_t (*proto_t) (const char *, size_t);
  24 size_t simple_strnlen (const char *, size_t);
  25
  26 IMPL (simple_strnlen, 0)
  27 IMPL (strnlen, 1)
  28
  29 size_t
  30 simple_strnlen (const char *s, size_t maxlen)
  31 {
  32   size_t i;
  33
  34   for (i = 0; i < maxlen && s[i]; ++i);
  35   return i;
  36 }
  37
  38 static void
  39 do_one_test (impl_t *impl, const char *s, size_t maxlen, size_t exp_len)
  40 {
  41   size_t len = CALL (impl, s, maxlen), i, iters = INNER_LOOP_ITERS;
  42   timing_t start, stop, cur;
  43
  44   if (len != exp_len)
  45     {
  46       error (0, 0, "Wrong result in function %s %zd %zd", impl->name,
  47              len, exp_len);
  48       ret = 1;
  49       return;
  50     }
  51
  52   TIMING_NOW (start);
  53   for (i = 0; i < iters; ++i)
  54     {
  55       CALL (impl, s, maxlen);
  56     }
  57   TIMING_NOW (stop);
  58
  59   TIMING_DIFF (cur, start, stop);
  60
  61   TIMING_PRINT_MEAN ((double) cur, (double) iters);
  62 }
  63
  64 static void
  65 do_test (size_t align, size_t len, size_t maxlen, int max_char)
  66 {
  67   size_t i;
  68
  69   align &= 7;
  70   if (align + len >= page_size)
  71     return;
  72
  73   for (i = 0; i < len; ++i)
  74     buf1[align + i] = 1 + 7 * i % max_char;
  75   buf1[align + len] = 0;
  76
  77   printf ("Length %4zd, alignment %2zd:", len, align);
  78
  79   FOR_EACH_IMPL (impl, 0)
  80     do_one_test (impl, (char *) (buf1 + align), maxlen, MIN (len, maxlen));
  81
  82   putchar ('\n');
  83 }
  84
  85 int
  86 test_main (void)
  87 {
  88   size_t i;
  89
  90   test_init ();
  91
  92   printf ("%20s", "");
  93   FOR_EACH_IMPL (impl, 0)
  94     printf ("\t%s", impl->name);
  95   putchar ('\n');
  96
  97   for (i = 1; i < 8; ++i)
  98     {
  99       do_test (0, i, i - 1, 127);
 100       do_test (0, i, i, 127);
 101       do_test (0, i, i + 1, 127);
 102     }
 103
 104   for (i = 1; i < 8; ++i)
 105     {
 106       do_test (i, i, i - 1, 127);
 107       do_test (i, i, i, 127);
 108       do_test (i, i, i + 1, 127);
 109     }
 110
 111   for (i = 2; i <= 10; ++i)
 112     {
 113       do_test (0, 1 << i, 5000, 127);
 114       do_test (1, 1 << i, 5000, 127);
 115     }
 116
 117   for (i = 1; i < 8; ++i)
 118     do_test (0, i, 5000, 255);
 119
 120   for (i = 1; i < 8; ++i)
 121     do_test (i, i, 5000, 255);
 122
 123   for (i = 2; i <= 10; ++i)
 124     {
 125       do_test (0, 1 << i, 5000, 255);
 126       do_test (1, 1 << i, 5000, 255);
 127     }
 128
 129   return ret;
 130 }
 131
 132 #include "../test-skeleton.c"