benchtests/bench-strcat.c

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