benchtests/bench-strncat.c

   1 /* Measure strncat 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 #ifndef WIDE
  21 # define TEST_NAME "strncat"
  22 #else
  23 # define TEST_NAME "wcsncat"
  24 #endif /* WIDE */
  25 #include "bench-string.h"
  26
  27 #ifndef WIDE
  28 # define STRNCAT strncat
  29 # define CHAR char
  30 # define SIMPLE_STRNCAT simple_strncat
  31 # define STUPID_STRNCAT stupid_strncat
  32 # define STRLEN strlen
  33 # define MEMCMP memcmp
  34 # define BIG_CHAR CHAR_MAX
  35 # define SMALL_CHAR 127
  36 #else
  37 # include <wchar.h>
  38 # define STRNCAT wcsncat
  39 # define CHAR wchar_t
  40 # define SIMPLE_STRNCAT simple_wcsncat
  41 # define STUPID_STRNCAT stupid_wcsncat
  42 # define STRLEN wcslen
  43 # define MEMCMP wmemcmp
  44 # define BIG_CHAR WCHAR_MAX
  45 # define SMALL_CHAR 1273
  46 #endif /* WIDE */
  47
  48 typedef CHAR *(*proto_t) (CHAR *, const CHAR *, size_t);
  49 CHAR *STUPID_STRNCAT (CHAR *, const CHAR *, size_t);
  50 CHAR *SIMPLE_STRNCAT (CHAR *, const CHAR *, size_t);
  51
  52 IMPL (STUPID_STRNCAT, 0)
  53 IMPL (STRNCAT, 2)
  54
  55 CHAR *
  56 STUPID_STRNCAT (CHAR *dst, const CHAR *src, size_t n)
  57 {
  58   CHAR *ret = dst;
  59   while (*dst++ != '\0');
  60   --dst;
  61   while (n--)
  62     if ((*dst++ = *src++) == '\0')
  63       return ret;
  64   *dst = '\0';
  65   return ret;
  66 }
  67
  68 static void
  69 do_one_test (impl_t *impl, CHAR *dst, const CHAR *src, size_t n)
  70 {
  71   size_t k = STRLEN (dst), i, iters = INNER_LOOP_ITERS;
  72   timing_t start, stop, cur;
  73
  74   if (CALL (impl, dst, src, n) != dst)
  75     {
  76       error (0, 0, "Wrong result in function %s %p != %p", impl->name,
  77              CALL (impl, dst, src, n), dst);
  78       ret = 1;
  79       return;
  80     }
  81
  82   size_t len = STRLEN (src);
  83   if (MEMCMP (dst + k, src, len + 1 > n ? n : len + 1) != 0)
  84     {
  85       error (0, 0, "Incorrect concatenation in function %s",
  86              impl->name);
  87       ret = 1;
  88       return;
  89     }
  90   if (n < len && dst[k + n] != '\0')
  91     {
  92       error (0, 0, "There is no zero in the end of output string in %s",
  93              impl->name);
  94       ret = 1;
  95       return;
  96     }
  97
  98   TIMING_NOW (start);
  99   for (i = 0; i < iters; ++i)
 100     {
 101       dst[k] = '\0';
 102       CALL (impl, dst, src, n);
 103     }
 104   TIMING_NOW (stop);
 105
 106   TIMING_DIFF (cur, start, stop);
 107
 108   TIMING_PRINT_MEAN ((double) cur, (double) iters);
 109 }
 110
 111 static void
 112 do_test (size_t align1, size_t align2, size_t len1, size_t len2,
 113          size_t n, int max_char)
 114 {
 115   size_t i;
 116   CHAR *s1, *s2;
 117
 118   align1 &= 7;
 119   if ((align1 + len1) * sizeof (CHAR) >= page_size)
 120     return;
 121   if ((align1 + n) * sizeof (CHAR) > page_size)
 122     return;
 123   align2 &= 7;
 124   if ((align2 + len1 + len2) * sizeof (CHAR) >= page_size)
 125     return;
 126   if ((align2 + len1 + n) * sizeof (CHAR) > page_size)
 127     return;
 128   s1 = (CHAR *) (buf1) + align1;
 129   s2 = (CHAR *) (buf2) + align2;
 130
 131   for (i = 0; i < len1; ++i)
 132     s1[i] = 32 + 23 * i % (max_char - 32);
 133   s1[len1] = '\0';
 134
 135   for (i = 0; i < len2; i++)
 136     s2[i] = 32 + 23 * i % (max_char - 32);
 137
 138   printf ("Length %4zd/%4zd, alignment %2zd/%2zd, N %4zd:",
 139           len1, len2, align1, align2, n);
 140
 141   FOR_EACH_IMPL (impl, 0)
 142     {
 143       s2[len2] = '\0';
 144       do_one_test (impl, s2, s1, n);
 145     }
 146
 147   putchar ('\n');
 148 }
 149
 150 int
 151 main (void)
 152 {
 153   size_t i, n;
 154
 155   test_init ();
 156
 157   printf ("%28s", "");
 158   FOR_EACH_IMPL (impl, 0)
 159     printf ("\t%s", impl->name);
 160   putchar ('\n');
 161
 162   for (n = 2; n <= 2048; n*=4)
 163     {
 164       do_test (0, 2, 2, 2, n, SMALL_CHAR);
 165       do_test (0, 0, 4, 4, n, SMALL_CHAR);
 166       do_test (4, 0, 4, 4, n, BIG_CHAR);
 167       do_test (0, 0, 8, 8, n, SMALL_CHAR);
 168       do_test (0, 8, 8, 8, n, SMALL_CHAR);
 169
 170       for (i = 1; i < 8; ++i)
 171         {
 172           do_test (0, 0, 8 << i, 8 << i, n, SMALL_CHAR);
 173           do_test (8 - i, 2 * i, 8 << i, 8 << i, n, SMALL_CHAR);
 174           do_test (0, 0, 8 << i, 2 << i, n, SMALL_CHAR);
 175           do_test (8 - i, 2 * i, 8 << i, 2 << i, n, SMALL_CHAR);
 176         }
 177
 178       for (i = 1; i < 8; ++i)
 179         {
 180           do_test (i, 2 * i, 8 << i, 1, n, SMALL_CHAR);
 181           do_test (2 * i, i, 8 << i, 1, n, BIG_CHAR);
 182           do_test (i, i, 8 << i, 10, n, SMALL_CHAR);
 183         }
 184     }
 185
 186   return ret;
 187 }