benchtests/bench-strncpy.c

   1 /* Measure strncpy functions.
   2    Copyright (C) 2013-2018 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 BIG_CHAR WCHAR_MAX
  24 # define SMALL_CHAR 1273
  25 # define MEMCMP wmemcmp
  26 # define MEMSET wmemset
  27 # define STRNLEN wcsnlen
  28 #else
  29 # define CHAR char
  30 # define UCHAR unsigned char
  31 # define BIG_CHAR CHAR_MAX
  32 # define SMALL_CHAR 127
  33 # define MEMCMP memcmp
  34 # define MEMSET memset
  35 # define STRNLEN strnlen
  36 #endif /* !WIDE */
  37
  38
  39 #ifndef STRNCPY_RESULT
  40 # define STRNCPY_RESULT(dst, len, n) dst
  41 # define TEST_MAIN
  42 # ifndef WIDE
  43 #  define TEST_NAME "strncpy"
  44 # else
  45 #  define TEST_NAME "wcsncpy"
  46 # endif /* WIDE */
  47 # include "bench-string.h"
  48 # ifndef WIDE
  49 #  define SIMPLE_STRNCPY simple_strncpy
  50 #  define STUPID_STRNCPY stupid_strncpy
  51 #  define STRNCPY strncpy
  52 # else
  53 #  define SIMPLE_STRNCPY simple_wcsncpy
  54 #  define STUPID_STRNCPY stupid_wcsncpy
  55 #  define STRNCPY wcsncpy
  56 # endif /* WIDE */
  57
  58 CHAR *SIMPLE_STRNCPY (CHAR *, const CHAR *, size_t);
  59 CHAR *STUPID_STRNCPY (CHAR *, const CHAR *, size_t);
  60
  61 IMPL (STUPID_STRNCPY, 0)
  62 IMPL (SIMPLE_STRNCPY, 0)
  63 IMPL (STRNCPY, 1)
  64
  65 CHAR *
  66 SIMPLE_STRNCPY (CHAR *dst, const CHAR *src, size_t n)
  67 {
  68   CHAR *ret = dst;
  69   while (n--)
  70     if ((*dst++ = *src++) == '\0')
  71       {
  72         while (n--)
  73           *dst++ = '\0';
  74         return ret;
  75       }
  76   return ret;
  77 }
  78
  79 CHAR *
  80 STUPID_STRNCPY (CHAR *dst, const CHAR *src, size_t n)
  81 {
  82   size_t nc = STRNLEN (src, n);
  83   size_t i;
  84
  85   for (i = 0; i < nc; ++i)
  86     dst[i] = src[i];
  87   for (; i < n; ++i)
  88     dst[i] = '\0';
  89   return dst;
  90 }
  91 #endif /* !STRNCPY_RESULT */
  92
  93 typedef CHAR *(*proto_t) (CHAR *, const CHAR *, size_t);
  94
  95 static void
  96 do_one_test (impl_t *impl, CHAR *dst, const CHAR *src, size_t len, size_t n)
  97 {
  98   size_t i, iters = INNER_LOOP_ITERS;
  99   timing_t start, stop, cur;
 100
 101   if (CALL (impl, dst, src, n) != STRNCPY_RESULT (dst, len, n))
 102     {
 103       error (0, 0, "Wrong result in function %s %p %p", impl->name,
 104              CALL (impl, dst, src, n), dst);
 105       ret = 1;
 106       return;
 107     }
 108
 109   if (memcmp (dst, src, (len > n ? n : len) * sizeof (CHAR)) != 0)
 110     {
 111       error (0, 0, "Wrong result in function %s", impl->name);
 112       ret = 1;
 113       return;
 114     }
 115
 116   if (n > len)
 117     {
 118       size_t i;
 119
 120       for (i = len; i < n; ++i)
 121         if (dst [i] != '\0')
 122           {
 123             error (0, 0, "Wrong result in function %s", impl->name);
 124             ret = 1;
 125             return;
 126           }
 127     }
 128
 129   TIMING_NOW (start);
 130   for (i = 0; i < iters; ++i)
 131     {
 132       CALL (impl, dst, src, n);
 133     }
 134   TIMING_NOW (stop);
 135
 136   TIMING_DIFF (cur, start, stop);
 137
 138   TIMING_PRINT_MEAN ((double) cur, (double) iters);
 139 }
 140
 141 static void
 142 do_test (size_t align1, size_t align2, size_t len, size_t n, int max_char)
 143 {
 144   size_t i;
 145   CHAR *s1, *s2;
 146
 147 /* For wcsncpy: align1 and align2 here mean alignment not in bytes,
 148    but in wchar_ts, in bytes it will equal to align * (sizeof (wchar_t)).  */
 149   align1 &= 7;
 150   if ((align1 + len) * sizeof (CHAR) >= page_size)
 151     return;
 152
 153   align2 &= 7;
 154   if ((align2 + len) * sizeof (CHAR) >= page_size)
 155     return;
 156
 157   s1 = (CHAR *) (buf1) + align1;
 158   s2 = (CHAR *) (buf2) + align2;
 159
 160   for (i = 0; i < len; ++i)
 161     s1[i] = 32 + 23 * i % (max_char - 32);
 162   s1[len] = 0;
 163   for (i = len + 1; (i + align1) * sizeof (CHAR) < page_size && i < len + 64;
 164        ++i)
 165     s1[i] = 32 + 32 * i % (max_char - 32);
 166
 167   printf ("Length %4zd, n %4zd, alignment %2zd/%2zd:", len, n, align1, align2);
 168
 169   FOR_EACH_IMPL (impl, 0)
 170     do_one_test (impl, s2, s1, len, n);
 171
 172   putchar ('\n');
 173 }
 174
 175 static int
 176 test_main (void)
 177 {
 178   size_t i;
 179
 180   test_init ();
 181
 182   printf ("%28s", "");
 183   FOR_EACH_IMPL (impl, 0)
 184     printf ("\t%s", impl->name);
 185   putchar ('\n');
 186
 187   for (i = 1; i < 8; ++i)
 188     {
 189       do_test (i, i, 16, 16, SMALL_CHAR);
 190       do_test (i, i, 16, 16, BIG_CHAR);
 191       do_test (i, 2 * i, 16, 16, SMALL_CHAR);
 192       do_test (2 * i, i, 16, 16, BIG_CHAR);
 193       do_test (8 - i, 2 * i, 1 << i, 2 << i, SMALL_CHAR);
 194       do_test (2 * i, 8 - i, 2 << i, 1 << i, SMALL_CHAR);
 195       do_test (8 - i, 2 * i, 1 << i, 2 << i, BIG_CHAR);
 196       do_test (2 * i, 8 - i, 2 << i, 1 << i, BIG_CHAR);
 197     }
 198
 199   for (i = 1; i < 8; ++i)
 200     {
 201       do_test (0, 0, 4 << i, 8 << i, SMALL_CHAR);
 202       do_test (0, 0, 16 << i, 8 << i, SMALL_CHAR);
 203       do_test (8 - i, 2 * i, 4 << i, 8 << i, SMALL_CHAR);
 204       do_test (8 - i, 2 * i, 16 << i, 8 << i, SMALL_CHAR);
 205     }
 206
 207   return ret;
 208 }
 209
 210 #include <support/test-driver.c>