benchtests/bench-memset.c

   1 /* Measure memset 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 #define TEST_MAIN
  20 #ifdef TEST_BZERO
  21 # define TEST_NAME "bzero"
  22 #else
  23 # ifndef WIDE
  24 #  define TEST_NAME "memset"
  25 # else
  26 #  define TEST_NAME "wmemset"
  27 # endif /* WIDE */
  28 #endif /* !TEST_BZERO */
  29 #define MIN_PAGE_SIZE 131072
  30 #include "bench-string.h"
  31
  32 #ifndef WIDE
  33 # define MEMSET memset
  34 # define CHAR char
  35 # define SIMPLE_MEMSET simple_memset
  36 # define MEMCMP memcmp
  37 #else
  38 # include <wchar.h>
  39 # define MEMSET wmemset
  40 # define CHAR wchar_t
  41 # define SIMPLE_MEMSET simple_wmemset
  42 # define MEMCMP wmemcmp
  43 #endif /* WIDE */
  44
  45 CHAR *SIMPLE_MEMSET (CHAR *, int, size_t);
  46
  47 #ifdef TEST_BZERO
  48 typedef void (*proto_t) (char *, size_t);
  49 void simple_bzero (char *, size_t);
  50 void builtin_bzero (char *, size_t);
  51
  52 IMPL (simple_bzero, 0)
  53 IMPL (builtin_bzero, 0)
  54 IMPL (bzero, 1)
  55
  56 void
  57 simple_bzero (char *s, size_t n)
  58 {
  59   SIMPLE_MEMSET (s, 0, n);
  60 }
  61
  62 void
  63 builtin_bzero (char *s, size_t n)
  64 {
  65   __builtin_bzero (s, n);
  66 }
  67 #else
  68 typedef CHAR *(*proto_t) (CHAR *, int, size_t);
  69
  70 IMPL (SIMPLE_MEMSET, 0)
  71 # ifndef WIDE
  72 char *builtin_memset (char *, int, size_t);
  73 IMPL (builtin_memset, 0)
  74 # endif /* !WIDE */
  75 IMPL (MEMSET, 1)
  76
  77 # ifndef WIDE
  78 char *
  79 builtin_memset (char *s, int c, size_t n)
  80 {
  81   return __builtin_memset (s, c, n);
  82 }
  83 # endif /* !WIDE */
  84 #endif /* !TEST_BZERO */
  85
  86 CHAR *
  87 inhibit_loop_to_libcall
  88 SIMPLE_MEMSET (CHAR *s, int c, size_t n)
  89 {
  90   CHAR *r = s, *end = s + n;
  91   while (r < end)
  92     *r++ = c;
  93   return s;
  94 }
  95
  96 static void
  97 do_one_test (impl_t *impl, CHAR *s, int c __attribute ((unused)), size_t n)
  98 {
  99   size_t i, iters = INNER_LOOP_ITERS;
 100   timing_t start, stop, cur;
 101   CHAR tstbuf[n];
 102 #ifdef TEST_BZERO
 103   simple_bzero (tstbuf, n);
 104   CALL (impl, s, n);
 105   if (memcmp (s, tstbuf, n) != 0)
 106 #else
 107   CHAR *res = CALL (impl, s, c, n);
 108   if (res != s
 109       || SIMPLE_MEMSET (tstbuf, c, n) != tstbuf
 110       || MEMCMP (s, tstbuf, n) != 0)
 111 #endif /* !TEST_BZERO */
 112     {
 113       error (0, 0, "Wrong result in function %s", impl->name);
 114       ret = 1;
 115       return;
 116     }
 117
 118   TIMING_NOW (start);
 119   for (i = 0; i < iters; ++i)
 120     {
 121 #ifdef TEST_BZERO
 122       CALL (impl, s, n);
 123 #else
 124       CALL (impl, s, c, n);
 125 #endif /* !TEST_BZERO */
 126     }
 127   TIMING_NOW (stop);
 128
 129   TIMING_DIFF (cur, start, stop);
 130
 131   TIMING_PRINT_MEAN ((double) cur, (double) iters);
 132 }
 133
 134 static void
 135 do_test (size_t align, int c, size_t len)
 136 {
 137   align &= 63;
 138   if ((align + len) * sizeof (CHAR) > page_size)
 139     return;
 140
 141   printf ("Length %4zd, alignment %2zd, c %2d:", len, align, c);
 142
 143   FOR_EACH_IMPL (impl, 0)
 144     do_one_test (impl, (CHAR *) (buf1) + align, c, len);
 145
 146   putchar ('\n');
 147 }
 148
 149 int
 150 test_main (void)
 151 {
 152   size_t i;
 153   int c = 0;
 154
 155   test_init ();
 156
 157   printf ("%24s", "");
 158   FOR_EACH_IMPL (impl, 0)
 159     printf ("\t%s", impl->name);
 160   putchar ('\n');
 161
 162 #ifndef TEST_BZERO
 163   for (c = -65; c <= 130; c += 65)
 164 #endif
 165     {
 166       for (i = 0; i < 18; ++i)
 167         do_test (0, c, 1 << i);
 168       for (i = 1; i < 32; ++i)
 169         {
 170           do_test (i, c, i);
 171           if (i & (i - 1))
 172             do_test (0, c, i);
 173         }
 174       for (i = 32; i < 512; i+=32)
 175         {
 176           do_test (0, c, i);
 177           do_test (i, c, i);
 178         }
 179       do_test (1, c, 14);
 180       do_test (3, c, 1024);
 181       do_test (4, c, 64);
 182       do_test (2, c, 25);
 183     }
 184   for (i = 33; i <= 256; i += 4)
 185     {
 186       do_test (0, c, 32 * i);
 187       do_test (i, c, 32 * i);
 188     }
 189
 190   return ret;
 191 }
 192
 193 #include <support/test-driver.c>