benchtests/bench-strspn.c

   1 /* Measure strspn 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 "strspn"
  22 #else
  23 # define TEST_NAME "wcsspn"
  24 #endif /* WIDE */
  25 #include "bench-string.h"
  26
  27 #define BIG_CHAR MAX_CHAR
  28
  29 #ifndef WIDE
  30 # define SIMPLE_STRSPN simple_strspn
  31 # define SMALL_CHAR 127
  32 #else
  33 # define SIMPLE_STRSPN simple_wcsspn
  34 # define SMALL_CHAR 1273
  35 #endif /* WIDE */
  36
  37 typedef size_t (*proto_t) (const CHAR *, const CHAR *);
  38 size_t SIMPLE_STRSPN (const CHAR *, const CHAR *);
  39
  40 IMPL (SIMPLE_STRSPN, 0)
  41 IMPL (STRSPN, 1)
  42
  43 size_t
  44 SIMPLE_STRSPN (const CHAR *s, const CHAR *acc)
  45 {
  46   const CHAR *r, *str = s;
  47   CHAR c;
  48
  49   while ((c = *s++) != '\0')
  50     {
  51       for (r = acc; *r != '\0'; ++r)
  52         if (*r == c)
  53           break;
  54       if (*r == '\0')
  55         return s - str - 1;
  56     }
  57   return s - str - 1;
  58 }
  59
  60 static void
  61 do_one_test (impl_t *impl, const CHAR *s, const CHAR *acc, size_t exp_res)
  62 {
  63   size_t res = CALL (impl, s, acc), i, iters = INNER_LOOP_ITERS_MEDIUM;
  64   timing_t start, stop, cur;
  65
  66   if (res != exp_res)
  67     {
  68       error (0, 0, "Wrong result in function %s %p %p", impl->name,
  69              (void *) res, (void *) exp_res);
  70       ret = 1;
  71       return;
  72     }
  73
  74   TIMING_NOW (start);
  75   for (i = 0; i < iters; ++i)
  76     {
  77       CALL (impl, s, acc);
  78     }
  79   TIMING_NOW (stop);
  80
  81   TIMING_DIFF (cur, start, stop);
  82
  83   TIMING_PRINT_MEAN ((double) cur, (double) iters);
  84 }
  85
  86 static void
  87 do_test (size_t align, size_t pos, size_t len)
  88 {
  89   size_t i;
  90   CHAR *acc, *s;
  91
  92   align &= 7;
  93   if ((align + pos + 10) * sizeof (CHAR) >= page_size || len > 240 || ! len)
  94     return;
  95
  96   acc = (CHAR *) (buf2) + (random () & 255);
  97   s = (CHAR *) (buf1) + align;
  98
  99   for (i = 0; i < len; ++i)
 100     {
 101       acc[i] = random () & BIG_CHAR;
 102       if (!acc[i])
 103         acc[i] = random () & BIG_CHAR;
 104       if (!acc[i])
 105         acc[i] = 1 + (random () & SMALL_CHAR);
 106     }
 107   acc[len] = '\0';
 108
 109   for (i = 0; i < pos; ++i)
 110     s[i] = acc[random () % len];
 111   s[pos] = random () & BIG_CHAR;
 112   if (STRCHR (acc, s[pos]))
 113     s[pos] = '\0';
 114   else
 115     {
 116       for (i = pos + 1; i < pos + 10; ++i)
 117         s[i] = random () & BIG_CHAR;
 118       s[i] = '\0';
 119     }
 120
 121   printf ("Length %4zd, alignment %2zd, acc len %2zd:", pos, align, len);
 122
 123   FOR_EACH_IMPL (impl, 0)
 124     do_one_test (impl, s, acc, pos);
 125
 126   putchar ('\n');
 127 }
 128
 129 int
 130 test_main (void)
 131 {
 132   size_t i;
 133
 134   test_init ();
 135
 136   printf ("%32s", "");
 137   FOR_EACH_IMPL (impl, 0)
 138     printf ("\t%s", impl->name);
 139   putchar ('\n');
 140
 141   for (i = 0; i < 32; ++i)
 142     {
 143       do_test (0, 512, i);
 144       do_test (i, 512, i);
 145     }
 146
 147   for (i = 1; i < 8; ++i)
 148     {
 149       do_test (0, 16 << i, 4);
 150       do_test (i, 16 << i, 4);
 151     }
 152
 153   for (i = 1; i < 8; ++i)
 154     do_test (i, 64, 10);
 155
 156   for (i = 0; i < 64; ++i)
 157     do_test (0, i, 6);
 158
 159   return ret;
 160 }
 161
 162 #include <support/test-driver.c>