benchtests/bench-strncat.c

   1 /* Measure strncat functions.
   2    Copyright (C) 2013-2022 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 "strncat"
  22 #else
  23 # define TEST_NAME "wcsncat"
  24 # define generic_strncat generic_wcsncat
  25 #endif /* WIDE */
  26 #include "bench-string.h"
  27
  28 #define BIG_CHAR MAX_CHAR
  29
  30 #ifndef WIDE
  31 # define SMALL_CHAR 127
  32 #else
  33 # define SMALL_CHAR 1273
  34 #endif /* WIDE */
  35
  36 typedef CHAR *(*proto_t) (CHAR *, const CHAR *, size_t);
  37
  38 CHAR *
  39 generic_strncat (CHAR *dst, const CHAR *src, size_t n)
  40 {
  41   CHAR *end = dst + STRLEN (dst);
  42   n = STRNLEN (src, n);
  43   end[n] = 0;
  44   MEMCPY (end, src, n);
  45   return dst;
  46 }
  47
  48 IMPL (STRNCAT, 2)
  49 IMPL (generic_strncat, 0)
  50
  51 static void
  52 do_one_test (impl_t *impl, CHAR *dst, const CHAR *src, size_t n)
  53 {
  54   size_t k = STRLEN (dst), i, iters = INNER_LOOP_ITERS8;
  55   timing_t start, stop, cur;
  56
  57   if (CALL (impl, dst, src, n) != dst)
  58     {
  59       error (0, 0, "Wrong result in function %s %p != %p", impl->name,
  60              CALL (impl, dst, src, n), dst);
  61       ret = 1;
  62       return;
  63     }
  64
  65   size_t len = STRLEN (src);
  66   if (MEMCMP (dst + k, src, len + 1 > n ? n : len + 1) != 0)
  67     {
  68       error (0, 0, "Incorrect concatenation in function %s",
  69              impl->name);
  70       ret = 1;
  71       return;
  72     }
  73   if (n < len && dst[k + n] != '\0')
  74     {
  75       error (0, 0, "There is no zero in the end of output string in %s",
  76              impl->name);
  77       ret = 1;
  78       return;
  79     }
  80
  81   TIMING_NOW (start);
  82   for (i = 0; i < iters; ++i)
  83     {
  84       dst[k] = '\0';
  85       CALL (impl, dst, src, n);
  86     }
  87   TIMING_NOW (stop);
  88
  89   TIMING_DIFF (cur, start, stop);
  90
  91   TIMING_PRINT_MEAN ((double) cur, (double) iters);
  92 }
  93
  94 static void
  95 do_test (size_t align1, size_t align2, size_t len1, size_t len2,
  96          size_t n, int max_char)
  97 {
  98   size_t i;
  99   CHAR *s1, *s2;
 100
 101   align1 &= 7;
 102   if ((align1 + len1) * sizeof (CHAR) >= page_size)
 103     return;
 104   if ((align1 + n) * sizeof (CHAR) > page_size)
 105     return;
 106   align2 &= 7;
 107   if ((align2 + len1 + len2) * sizeof (CHAR) >= page_size)
 108     return;
 109   if ((align2 + len1 + n) * sizeof (CHAR) > page_size)
 110     return;
 111   s1 = (CHAR *) (buf1) + align1;
 112   s2 = (CHAR *) (buf2) + align2;
 113
 114   for (i = 0; i < len1; ++i)
 115     s1[i] = 32 + 23 * i % (max_char - 32);
 116   s1[len1] = '\0';
 117
 118   for (i = 0; i < len2; i++)
 119     s2[i] = 32 + 23 * i % (max_char - 32);
 120
 121   printf ("Length %4zd/%4zd, alignment %2zd/%2zd, N %4zd:",
 122           len1, len2, align1, align2, n);
 123
 124   FOR_EACH_IMPL (impl, 0)
 125     {
 126       s2[len2] = '\0';
 127       do_one_test (impl, s2, s1, n);
 128     }
 129
 130   putchar ('\n');
 131 }
 132
 133 int
 134 main (void)
 135 {
 136   size_t i, n;
 137
 138   test_init ();
 139
 140   printf ("%28s", "");
 141   FOR_EACH_IMPL (impl, 0)
 142     printf ("\t%s", impl->name);
 143   putchar ('\n');
 144
 145   for (n = 2; n <= 2048; n*=4)
 146     {
 147       do_test (0, 2, 2, 2, n, SMALL_CHAR);
 148       do_test (0, 0, 4, 4, n, SMALL_CHAR);
 149       do_test (4, 0, 4, 4, n, BIG_CHAR);
 150       do_test (0, 0, 8, 8, n, SMALL_CHAR);
 151       do_test (0, 8, 8, 8, n, SMALL_CHAR);
 152
 153       for (i = 1; i < 8; ++i)
 154         {
 155           do_test (0, 0, 8 << i, 8 << i, n, SMALL_CHAR);
 156           do_test (8 - i, 2 * i, 8 << i, 8 << i, n, SMALL_CHAR);
 157           do_test (0, 0, 8 << i, 2 << i, n, SMALL_CHAR);
 158           do_test (8 - i, 2 * i, 8 << i, 2 << i, n, SMALL_CHAR);
 159         }
 160
 161       for (i = 1; i < 8; ++i)
 162         {
 163           do_test (i, 2 * i, 8 << i, 1, n, SMALL_CHAR);
 164           do_test (2 * i, i, 8 << i, 1, n, BIG_CHAR);
 165           do_test (i, i, 8 << i, 10, n, SMALL_CHAR);
 166         }
 167     }
 168
 169   return ret;
 170 }