benchtests/bench-strcpy.c

   1 /* Measure strcpy functions.
   2    Copyright (C) 2013-2020 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 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 #  define generic_strcpy generic_wcscpy
  37 # endif
  38 #include "bench-string.h"
  39
  40 CHAR *
  41 generic_strcpy (CHAR *dst, const CHAR *src)
  42 {
  43   return MEMCPY (dst, src, STRLEN (src) + 1);
  44 }
  45
  46 IMPL (STRCPY, 1)
  47 IMPL (generic_strcpy, 0)
  48
  49 #endif
  50
  51 typedef CHAR *(*proto_t) (CHAR *, const CHAR *);
  52
  53 static void
  54 do_one_test (impl_t *impl, CHAR *dst, const CHAR *src,
  55              size_t len __attribute__((unused)))
  56 {
  57   size_t i, iters = INNER_LOOP_ITERS;
  58   timing_t start, stop, cur;
  59
  60   if (CALL (impl, dst, src) != STRCPY_RESULT (dst, len))
  61     {
  62       error (0, 0, "Wrong result in function %s %p %p", impl->name,
  63              CALL (impl, dst, src), STRCPY_RESULT (dst, len));
  64       ret = 1;
  65       return;
  66     }
  67
  68   if (STRCMP (dst, src) != 0)
  69     {
  70       error (0, 0,
  71              "Wrong result in function %s dst \"%" sfmt "\" src \"%" sfmt "\"",
  72              impl->name, dst, src);
  73       ret = 1;
  74       return;
  75     }
  76
  77   TIMING_NOW (start);
  78   for (i = 0; i < iters; ++i)
  79     {
  80           CALL (impl, dst, src);
  81     }
  82   TIMING_NOW (stop);
  83
  84   TIMING_DIFF (cur, start, stop);
  85
  86   TIMING_PRINT_MEAN ((double) cur, (double) iters);
  87 }
  88
  89 static void
  90 do_test (size_t align1, size_t align2, size_t len, int max_char)
  91 {
  92   size_t i;
  93   CHAR *s1, *s2;
  94 /* For wcscpy: align1 and align2 here mean alignment not in bytes,
  95    but in wchar_ts, in bytes it will equal to align * (sizeof (wchar_t))
  96    len for wcschr here isn't in bytes but it's number of wchar_t symbols.  */
  97   align1 &= 7;
  98   if ((align1 + len) * sizeof (CHAR) >= page_size)
  99     return;
 100
 101   align2 &= 7;
 102   if ((align2 + len) * sizeof (CHAR) >= page_size)
 103     return;
 104
 105   s1 = (CHAR *) (buf1) + align1;
 106   s2 = (CHAR *) (buf2) + align2;
 107
 108   for (i = 0; i < len; i++)
 109     s1[i] = 32 + 23 * i % (max_char - 32);
 110   s1[len] = 0;
 111
 112   printf ("Length %4zd, alignments in bytes %2zd/%2zd:", len,
 113           align1 * sizeof (CHAR), align2 * sizeof (CHAR));
 114
 115   FOR_EACH_IMPL (impl, 0)
 116     do_one_test (impl, s2, s1, len);
 117
 118   putchar ('\n');
 119 }
 120
 121 int
 122 test_main (void)
 123 {
 124   size_t i;
 125
 126   test_init ();
 127
 128   printf ("%23s", "");
 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, SMALL_CHAR);
 136       do_test (0, 0, i, BIG_CHAR);
 137       do_test (0, i, i, SMALL_CHAR);
 138       do_test (i, 0, i, BIG_CHAR);
 139     }
 140
 141   for (i = 1; i < 8; ++i)
 142     {
 143       do_test (0, 0, 8 << i, SMALL_CHAR);
 144       do_test (8 - i, 2 * i, 8 << i, SMALL_CHAR);
 145     }
 146
 147   for (i = 1; i < 8; ++i)
 148     {
 149       do_test (i, 2 * i, 8 << i, SMALL_CHAR);
 150       do_test (2 * i, i, 8 << i, BIG_CHAR);
 151       do_test (i, i, 8 << i, SMALL_CHAR);
 152       do_test (i, i, 8 << i, BIG_CHAR);
 153     }
 154
 155   for (i = 16; i <= 512; i+=4)
 156     {
 157       do_test (0, 4, i, SMALL_CHAR);
 158       do_test (4, 0, i, BIG_CHAR);
 159       do_test (4, 4, i, SMALL_CHAR);
 160       do_test (2, 2, i, BIG_CHAR);
 161       do_test (2, 6, i, SMALL_CHAR);
 162       do_test (6, 2, i, BIG_CHAR);
 163       do_test (1, 7, i, SMALL_CHAR);
 164       do_test (7, 1, i, BIG_CHAR);
 165       do_test (3, 4, i, SMALL_CHAR);
 166       do_test (4, 3, i, BIG_CHAR);
 167       do_test (5, 7, i, SMALL_CHAR);
 168       do_test (7, 5, i, SMALL_CHAR);
 169     }
 170
 171   return ret;
 172 }
 173
 174 #include <support/test-driver.c>