benchtests/bench-strcpy.c

   1 /* Measure strcpy functions.
   2    Copyright (C) 2013-2017 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 #ifdef WIDE
  20 # include <wchar.h>
  21 # define CHAR wchar_t
  22 # define UCHAR wchar_t
  23 # define sfmt "ls"
  24 # define BIG_CHAR WCHAR_MAX
  25 # define SMALL_CHAR 1273
  26 # define STRCMP wcscmp
  27 # define MEMCMP wmemcmp
  28 # define MEMSET wmemset
  29 #else
  30 # define CHAR char
  31 # define UCHAR unsigned char
  32 # define sfmt "s"
  33 # define BIG_CHAR CHAR_MAX
  34 # define SMALL_CHAR 127
  35 # define STRCMP strcmp
  36 # define MEMCMP memcmp
  37 # define MEMSET memset
  38 #endif
  39
  40 #ifndef STRCPY_RESULT
  41 # define STRCPY_RESULT(dst, len) dst
  42 # define TEST_MAIN
  43 # ifndef WIDE
  44 #  define TEST_NAME "strcpy"
  45 # else
  46 #  define TEST_NAME "wcscpy"
  47 # endif
  48 # include "bench-string.h"
  49 # ifndef WIDE
  50 #  define SIMPLE_STRCPY simple_strcpy
  51 #  define STRCPY strcpy
  52 # else
  53 #  define SIMPLE_STRCPY simple_wcscpy
  54 #  define STRCPY wcscpy
  55 # endif
  56
  57 CHAR *SIMPLE_STRCPY (CHAR *, const CHAR *);
  58
  59 IMPL (SIMPLE_STRCPY, 0)
  60 IMPL (STRCPY, 1)
  61
  62 CHAR *
  63 SIMPLE_STRCPY (CHAR *dst, const CHAR *src)
  64 {
  65   CHAR *ret = dst;
  66   while ((*dst++ = *src++) != '\0');
  67   return ret;
  68 }
  69 #endif
  70
  71 typedef CHAR *(*proto_t) (CHAR *, const CHAR *);
  72
  73 static void
  74 do_one_test (impl_t *impl, CHAR *dst, const CHAR *src,
  75              size_t len __attribute__((unused)))
  76 {
  77   size_t i, iters = INNER_LOOP_ITERS;
  78   timing_t start, stop, cur;
  79
  80   if (CALL (impl, dst, src) != STRCPY_RESULT (dst, len))
  81     {
  82       error (0, 0, "Wrong result in function %s %p %p", impl->name,
  83              CALL (impl, dst, src), STRCPY_RESULT (dst, len));
  84       ret = 1;
  85       return;
  86     }
  87
  88   if (STRCMP (dst, src) != 0)
  89     {
  90       error (0, 0,
  91              "Wrong result in function %s dst \"%" sfmt "\" src \"%" sfmt "\"",
  92              impl->name, dst, src);
  93       ret = 1;
  94       return;
  95     }
  96
  97   TIMING_NOW (start);
  98   for (i = 0; i < iters; ++i)
  99     {
 100           CALL (impl, dst, src);
 101     }
 102   TIMING_NOW (stop);
 103
 104   TIMING_DIFF (cur, start, stop);
 105
 106   TIMING_PRINT_MEAN ((double) cur, (double) iters);
 107 }
 108
 109 static void
 110 do_test (size_t align1, size_t align2, size_t len, int max_char)
 111 {
 112   size_t i;
 113   CHAR *s1, *s2;
 114 /* For wcscpy: align1 and align2 here mean alignment not in bytes,
 115    but in wchar_ts, in bytes it will equal to align * (sizeof (wchar_t))
 116    len for wcschr here isn't in bytes but it's number of wchar_t symbols.  */
 117   align1 &= 7;
 118   if ((align1 + len) * sizeof(CHAR) >= page_size)
 119     return;
 120
 121   align2 &= 7;
 122   if ((align2 + len) * sizeof(CHAR) >= page_size)
 123     return;
 124
 125   s1 = (CHAR *) (buf1) + align1;
 126   s2 = (CHAR *) (buf2) + align2;
 127
 128   for (i = 0; i < len; i++)
 129     s1[i] = 32 + 23 * i % (max_char - 32);
 130   s1[len] = 0;
 131
 132   printf ("Length %4zd, alignments in bytes %2zd/%2zd:", len, align1 * sizeof(CHAR), align2 * sizeof(CHAR));
 133
 134   FOR_EACH_IMPL (impl, 0)
 135     do_one_test (impl, s2, s1, len);
 136
 137   putchar ('\n');
 138 }
 139
 140 int
 141 test_main (void)
 142 {
 143   size_t i;
 144
 145   test_init ();
 146
 147   printf ("%23s", "");
 148   FOR_EACH_IMPL (impl, 0)
 149     printf ("\t%s", impl->name);
 150   putchar ('\n');
 151
 152   for (i = 0; i < 16; ++i)
 153     {
 154       do_test (0, 0, i, SMALL_CHAR);
 155       do_test (0, 0, i, BIG_CHAR);
 156       do_test (0, i, i, SMALL_CHAR);
 157       do_test (i, 0, i, BIG_CHAR);
 158     }
 159
 160   for (i = 1; i < 8; ++i)
 161     {
 162       do_test (0, 0, 8 << i, SMALL_CHAR);
 163       do_test (8 - i, 2 * i, 8 << i, SMALL_CHAR);
 164     }
 165
 166   for (i = 1; i < 8; ++i)
 167     {
 168       do_test (i, 2 * i, 8 << i, SMALL_CHAR);
 169       do_test (2 * i, i, 8 << i, BIG_CHAR);
 170       do_test (i, i, 8 << i, SMALL_CHAR);
 171       do_test (i, i, 8 << i, BIG_CHAR);
 172     }
 173
 174   for (i = 16; i <= 512; i+=4)
 175     {
 176       do_test (0, 4, i, SMALL_CHAR);
 177       do_test (4, 0, i, BIG_CHAR);
 178       do_test (4, 4, i, SMALL_CHAR);
 179       do_test (2, 2, i, BIG_CHAR);
 180       do_test (2, 6, i, SMALL_CHAR);
 181       do_test (6, 2, i, BIG_CHAR);
 182       do_test (1, 7, i, SMALL_CHAR);
 183       do_test (7, 1, i, BIG_CHAR);
 184       do_test (3, 4, i, SMALL_CHAR);
 185       do_test (4, 3, i, BIG_CHAR);
 186       do_test (5, 7, i, SMALL_CHAR);
 187       do_test (7, 5, i, SMALL_CHAR);
 188     }
 189
 190   return ret;
 191 }
 192
 193 #include <support/test-driver.c>