benchtests/bench-strnlen.c

   1 /* Measure strlen functions.
   2    Copyright (C) 2013 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);
  42   if (len != exp_len)
  43     {
  44       error (0, 0, "Wrong result in function %s %zd %zd", impl->name,
  45              len, exp_len);
  46       ret = 1;
  47       return;
  48     }
  49
  50   if (HP_TIMING_AVAIL)
  51     {
  52       hp_timing_t start __attribute ((unused));
  53       hp_timing_t stop __attribute ((unused));
  54       hp_timing_t best_time = ~ (hp_timing_t) 0;
  55       size_t i;
  56
  57       for (i = 0; i < 32; ++i)
  58         {
  59           HP_TIMING_NOW (start);
  60           CALL (impl, s, maxlen);
  61           HP_TIMING_NOW (stop);
  62           HP_TIMING_BEST (best_time, start, stop);
  63         }
  64
  65       printf ("\t%zd", (size_t) best_time);
  66     }
  67 }
  68
  69 static void
  70 do_test (size_t align, size_t len, size_t maxlen, int max_char)
  71 {
  72   size_t i;
  73
  74   align &= 7;
  75   if (align + len >= page_size)
  76     return;
  77
  78   for (i = 0; i < len; ++i)
  79     buf1[align + i] = 1 + 7 * i % max_char;
  80   buf1[align + len] = 0;
  81
  82   if (HP_TIMING_AVAIL)
  83     printf ("Length %4zd, alignment %2zd:", len, align);
  84
  85   FOR_EACH_IMPL (impl, 0)
  86     do_one_test (impl, (char *) (buf1 + align), maxlen, MIN (len, maxlen));
  87
  88   if (HP_TIMING_AVAIL)
  89     putchar ('\n');
  90 }
  91
  92 int
  93 test_main (void)
  94 {
  95   size_t i;
  96
  97   test_init ();
  98
  99   printf ("%20s", "");
 100   FOR_EACH_IMPL (impl, 0)
 101     printf ("\t%s", impl->name);
 102   putchar ('\n');
 103
 104   for (i = 1; i < 8; ++i)
 105     {
 106       do_test (0, i, i - 1, 127);
 107       do_test (0, i, i, 127);
 108       do_test (0, i, i + 1, 127);
 109     }
 110
 111   for (i = 1; i < 8; ++i)
 112     {
 113       do_test (i, i, i - 1, 127);
 114       do_test (i, i, i, 127);
 115       do_test (i, i, i + 1, 127);
 116     }
 117
 118   for (i = 2; i <= 10; ++i)
 119     {
 120       do_test (0, 1 << i, 5000, 127);
 121       do_test (1, 1 << i, 5000, 127);
 122     }
 123
 124   for (i = 1; i < 8; ++i)
 125     do_test (0, i, 5000, 255);
 126
 127   for (i = 1; i < 8; ++i)
 128     do_test (i, i, 5000, 255);
 129
 130   for (i = 2; i <= 10; ++i)
 131     {
 132       do_test (0, 1 << i, 5000, 255);
 133       do_test (1, 1 << i, 5000, 255);
 134     }
 135
 136   return ret;
 137 }
 138
 139 #include "../test-skeleton.c"