benchtests/bench-strcat.c

   1 /* Measure strcat functions.
   2    Copyright (C) 2013-2018 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 #ifndef WIDE
  21 # define TEST_NAME "strcat"
  22 #else
  23 # define TEST_NAME "wcscat"
  24 #endif /* WIDE */
  25 #include "bench-string.h"
  26
  27 #define BIG_CHAR MAX_CHAR
  28
  29 #ifndef WIDE
  30 # define sfmt "s"
  31 # define SIMPLE_STRCAT simple_strcat
  32 # define SMALL_CHAR 127
  33 #else
  34 # define sfmt "ls"
  35 # define SIMPLE_STRCAT simple_wcscat
  36 # define SMALL_CHAR 1273
  37 #endif /* WIDE */
  38
  39
  40 typedef CHAR *(*proto_t) (CHAR *, const CHAR *);
  41 CHAR *SIMPLE_STRCAT (CHAR *, const CHAR *);
  42
  43 IMPL (SIMPLE_STRCAT, 0)
  44 IMPL (STRCAT, 1)
  45
  46 CHAR *
  47 SIMPLE_STRCAT (CHAR *dst, const CHAR *src)
  48 {
  49   CHAR *ret = dst;
  50   while (*dst++ != '\0');
  51   --dst;
  52   while ((*dst++ = *src++) != '\0');
  53   return ret;
  54 }
  55
  56 static void
  57 do_one_test (impl_t *impl, CHAR *dst, const CHAR *src)
  58 {
  59   size_t k = STRLEN (dst), i, iters = INNER_LOOP_ITERS;
  60   timing_t start, stop, cur;
  61
  62   if (CALL (impl, dst, src) != dst)
  63     {
  64       error (0, 0, "Wrong result in function %s %p %p", impl->name,
  65              CALL (impl, dst, src), dst);
  66       ret = 1;
  67       return;
  68     }
  69
  70   if (STRCMP (dst + k, src) != 0)
  71     {
  72       error (0, 0, "Wrong result in function %s dst \"%" sfmt "\" src \"%" sfmt "\"",
  73              impl->name, dst, src);
  74       ret = 1;
  75       return;
  76     }
  77
  78   TIMING_NOW (start);
  79   for (i = 0; i < iters; ++i)
  80     {
  81       dst[k] = '\0';
  82       CALL (impl, dst, src);
  83     }
  84   TIMING_NOW (stop);
  85
  86   TIMING_DIFF (cur, start, stop);
  87
  88   TIMING_PRINT_MEAN ((double) cur, (double) iters);
  89 }
  90
  91 static void
  92 do_test (size_t align1, size_t align2, size_t len1, size_t len2, int max_char)
  93 {
  94   size_t i;
  95   CHAR *s1, *s2;
  96
  97   align1 &= 7;
  98   if ((align1 + len1) * sizeof (CHAR) >= page_size)
  99     return;
 100
 101   align2 &= 7;
 102   if ((align2 + len1 + len2) * sizeof (CHAR) >= page_size)
 103     return;
 104
 105   s1 = (CHAR *) (buf1) + align1;
 106   s2 = (CHAR *) (buf2) + align2;
 107
 108   for (i = 0; i < len1; ++i)
 109     s1[i] = 32 + 23 * i % (max_char - 32);
 110   s1[len1] = '\0';
 111
 112   for (i = 0; i < len2; i++)
 113     s2[i] = 32 + 23 * i % (max_char - 32);
 114
 115   printf ("Length %4zd/%4zd, alignment %2zd/%2zd:", len1, len2, align1, align2);
 116
 117   FOR_EACH_IMPL (impl, 0)
 118     {
 119       s2[len2] = '\0';
 120       do_one_test (impl, s2, s1);
 121     }
 122
 123   putchar ('\n');
 124 }
 125
 126 int
 127 test_main (void)
 128 {
 129   size_t i;
 130
 131   test_init ();
 132
 133   printf ("%28s", "");
 134   FOR_EACH_IMPL (impl, 0)
 135     printf ("\t%s", impl->name);
 136   putchar ('\n');
 137
 138   for (i = 0; i < 16; ++i)
 139     {
 140       do_test (0, 0, i, i, SMALL_CHAR);
 141       do_test (0, 0, i, i, BIG_CHAR);
 142       do_test (0, i, i, i, SMALL_CHAR);
 143       do_test (i, 0, i, i, BIG_CHAR);
 144     }
 145
 146   for (i = 1; i < 8; ++i)
 147     {
 148       do_test (0, 0, 8 << i, 8 << i, SMALL_CHAR);
 149       do_test (8 - i, 2 * i, 8 << i, 8 << i, SMALL_CHAR);
 150       do_test (0, 0, 8 << i, 2 << i, SMALL_CHAR);
 151       do_test (8 - i, 2 * i, 8 << i, 2 << i, SMALL_CHAR);
 152     }
 153
 154   for (i = 1; i < 8; ++i)
 155     {
 156       do_test (i, 2 * i, 8 << i, 1, SMALL_CHAR);
 157       do_test (2 * i, i, 8 << i, 1, BIG_CHAR);
 158       do_test (i, i, 8 << i, 10, SMALL_CHAR);
 159       do_test (i, i, 8 << i, 10, BIG_CHAR);
 160     }
 161
 162   return ret;
 163 }
 164
 165 #include <support/test-driver.c>