benchtests/bench-strcpy.c

   1 /* Measure strcpy functions.
   2    Copyright (C) 2013-2019 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 BIG_CHAR MAX_CHAR
  20
  21 #ifdef WIDE
  22 # define sfmt "ls"
  23 # define SMALL_CHAR 1273
  24 #else
  25 # define sfmt "s"
  26 # define SMALL_CHAR 127
  27 #endif
  28
  29 #ifndef STRCPY_RESULT
  30 # define STRCPY_RESULT(dst, len) dst
  31 # define TEST_MAIN
  32 # ifndef WIDE
  33 #  define TEST_NAME "strcpy"
  34 # else
  35 #  define TEST_NAME "wcscpy"
  36 # endif
  37 # include "bench-string.h"
  38 # ifndef WIDE
  39 #  define SIMPLE_STRCPY simple_strcpy
  40 # else
  41 #  define SIMPLE_STRCPY simple_wcscpy
  42 # endif
  43
  44 CHAR *SIMPLE_STRCPY (CHAR *, const CHAR *);
  45
  46 IMPL (SIMPLE_STRCPY, 0)
  47 IMPL (STRCPY, 1)
  48
  49 CHAR *
  50 SIMPLE_STRCPY (CHAR *dst, const CHAR *src)
  51 {
  52   CHAR *ret = dst;
  53   while ((*dst++ = *src++) != '\0');
  54   return ret;
  55 }
  56 #endif
  57
  58 typedef CHAR *(*proto_t) (CHAR *, const CHAR *);
  59
  60 static void
  61 do_one_test (impl_t *impl, CHAR *dst, const CHAR *src,
  62              size_t len __attribute__((unused)))
  63 {
  64   size_t i, iters = INNER_LOOP_ITERS;
  65   timing_t start, stop, cur;
  66
  67   if (CALL (impl, dst, src) != STRCPY_RESULT (dst, len))
  68     {
  69       error (0, 0, "Wrong result in function %s %p %p", impl->name,
  70              CALL (impl, dst, src), STRCPY_RESULT (dst, len));
  71       ret = 1;
  72       return;
  73     }
  74
  75   if (STRCMP (dst, src) != 0)
  76     {
  77       error (0, 0,
  78              "Wrong result in function %s dst \"%" sfmt "\" src \"%" sfmt "\"",
  79              impl->name, dst, src);
  80       ret = 1;
  81       return;
  82     }
  83
  84   TIMING_NOW (start);
  85   for (i = 0; i < iters; ++i)
  86     {
  87           CALL (impl, dst, src);
  88     }
  89   TIMING_NOW (stop);
  90
  91   TIMING_DIFF (cur, start, stop);
  92
  93   TIMING_PRINT_MEAN ((double) cur, (double) iters);
  94 }
  95
  96 static void
  97 do_test (size_t align1, size_t align2, size_t len, int max_char)
  98 {
  99   size_t i;
 100   CHAR *s1, *s2;
 101 /* For wcscpy: align1 and align2 here mean alignment not in bytes,
 102    but in wchar_ts, in bytes it will equal to align * (sizeof (wchar_t))
 103    len for wcschr here isn't in bytes but it's number of wchar_t symbols.  */
 104   align1 &= 7;
 105   if ((align1 + len) * sizeof (CHAR) >= page_size)
 106     return;
 107
 108   align2 &= 7;
 109   if ((align2 + len) * sizeof (CHAR) >= page_size)
 110     return;
 111
 112   s1 = (CHAR *) (buf1) + align1;
 113   s2 = (CHAR *) (buf2) + align2;
 114
 115   for (i = 0; i < len; i++)
 116     s1[i] = 32 + 23 * i % (max_char - 32);
 117   s1[len] = 0;
 118
 119   printf ("Length %4zd, alignments in bytes %2zd/%2zd:", len,
 120           align1 * sizeof (CHAR), align2 * sizeof (CHAR));
 121
 122   FOR_EACH_IMPL (impl, 0)
 123     do_one_test (impl, s2, s1, len);
 124
 125   putchar ('\n');
 126 }
 127
 128 int
 129 test_main (void)
 130 {
 131   size_t i;
 132
 133   test_init ();
 134
 135   printf ("%23s", "");
 136   FOR_EACH_IMPL (impl, 0)
 137     printf ("\t%s", impl->name);
 138   putchar ('\n');
 139
 140   for (i = 0; i < 16; ++i)
 141     {
 142       do_test (0, 0, i, SMALL_CHAR);
 143       do_test (0, 0, i, BIG_CHAR);
 144       do_test (0, i, i, SMALL_CHAR);
 145       do_test (i, 0, i, BIG_CHAR);
 146     }
 147
 148   for (i = 1; i < 8; ++i)
 149     {
 150       do_test (0, 0, 8 << i, SMALL_CHAR);
 151       do_test (8 - i, 2 * i, 8 << i, SMALL_CHAR);
 152     }
 153
 154   for (i = 1; i < 8; ++i)
 155     {
 156       do_test (i, 2 * i, 8 << i, SMALL_CHAR);
 157       do_test (2 * i, i, 8 << i, BIG_CHAR);
 158       do_test (i, i, 8 << i, SMALL_CHAR);
 159       do_test (i, i, 8 << i, BIG_CHAR);
 160     }
 161
 162   for (i = 16; i <= 512; i+=4)
 163     {
 164       do_test (0, 4, i, SMALL_CHAR);
 165       do_test (4, 0, i, BIG_CHAR);
 166       do_test (4, 4, i, SMALL_CHAR);
 167       do_test (2, 2, i, BIG_CHAR);
 168       do_test (2, 6, i, SMALL_CHAR);
 169       do_test (6, 2, i, BIG_CHAR);
 170       do_test (1, 7, i, SMALL_CHAR);
 171       do_test (7, 1, i, BIG_CHAR);
 172       do_test (3, 4, i, SMALL_CHAR);
 173       do_test (4, 3, i, BIG_CHAR);
 174       do_test (5, 7, i, SMALL_CHAR);
 175       do_test (7, 5, i, SMALL_CHAR);
 176     }
 177
 178   return ret;
 179 }
 180
 181 #include <support/test-driver.c>