benchtests/bench-rawmemchr.c

   1 /* Measure memchr 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 #include <assert.h>
  20
  21 #define TEST_MAIN
  22 #define TEST_NAME "rawmemchr"
  23 #include "bench-string.h"
  24
  25 typedef char *(*proto_t) (const char *, int);
  26 char *simple_rawmemchr (const char *, int);
  27
  28 IMPL (simple_rawmemchr, 0)
  29 IMPL (rawmemchr, 1)
  30
  31 char *
  32 simple_rawmemchr (const char *s, int c)
  33 {
  34   while (1)
  35     if (*s++ == (char) c)
  36       return (char *) s - 1;
  37   return NULL;
  38 }
  39
  40 static void
  41 do_one_test (impl_t *impl, const char *s, int c, char *exp_res)
  42 {
  43   char *res = CALL (impl, s, c);
  44   if (res != exp_res)
  45     {
  46       error (0, 0, "Wrong result in function %s %p %p", impl->name,
  47              res, exp_res);
  48       ret = 1;
  49       return;
  50     }
  51
  52   if (HP_TIMING_AVAIL)
  53     {
  54       hp_timing_t start __attribute ((unused));
  55       hp_timing_t stop __attribute ((unused));
  56       hp_timing_t best_time = ~ (hp_timing_t) 0;
  57       size_t i;
  58
  59       for (i = 0; i < 32; ++i)
  60         {
  61           HP_TIMING_NOW (start);
  62           CALL (impl, s, c);
  63           HP_TIMING_NOW (stop);
  64           HP_TIMING_BEST (best_time, start, stop);
  65         }
  66
  67       printf ("\t%zd", (size_t) best_time);
  68     }
  69 }
  70
  71 static void
  72 do_test (size_t align, size_t pos, size_t len, int seek_char)
  73 {
  74   size_t i;
  75   char *result;
  76
  77   align &= 7;
  78   if (align + len >= page_size)
  79     return;
  80
  81   for (i = 0; i < len; ++i)
  82     {
  83       buf1[align + i] = 1 + 23 * i % 127;
  84       if (buf1[align + i] == seek_char)
  85         buf1[align + i] = seek_char + 1;
  86     }
  87   buf1[align + len] = 0;
  88
  89   assert (pos < len);
  90
  91   buf1[align + pos] = seek_char;
  92   buf1[align + len] = -seek_char;
  93   result = (char *) (buf1 + align + pos);
  94
  95   if (HP_TIMING_AVAIL)
  96     printf ("Length %4zd, alignment %2zd:", pos, align);
  97
  98   FOR_EACH_IMPL (impl, 0)
  99     do_one_test (impl, (char *) (buf1 + align), seek_char, result);
 100
 101   if (HP_TIMING_AVAIL)
 102     putchar ('\n');
 103 }
 104
 105 int
 106 test_main (void)
 107 {
 108   size_t i;
 109
 110   test_init ();
 111
 112   printf ("%20s", "");
 113   FOR_EACH_IMPL (impl, 0)
 114     printf ("\t%s", impl->name);
 115   putchar ('\n');
 116
 117   for (i = 1; i < 7; ++i)
 118     {
 119       do_test (0, 16 << i, 2048, 23);
 120       do_test (i, 64, 256, 23);
 121       do_test (0, 16 << i, 2048, 0);
 122       do_test (i, 64, 256, 0);
 123     }
 124   for (i = 1; i < 32; ++i)
 125     {
 126       do_test (0, i, i + 1, 23);
 127       do_test (0, i, i + 1, 0);
 128     }
 129
 130   return ret;
 131 }
 132
 133 #include "../test-skeleton.c"