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
 102   TIMING_NOW (start);
 103   for (i = 0; i < iters; ++i)
 104     {
 105 #ifdef TEST_BZERO
 106       CALL (impl, s, n);
 107 #else
 108       CALL (impl, s, c, n);
 109 #endif /* !TEST_BZERO */
 110     }
 111   TIMING_NOW (stop);
 112
 113   TIMING_DIFF (cur, start, stop);
 114
 115   TIMING_PRINT_MEAN ((double) cur, (double) iters);
 116 }
 117
 118 static void
 119 do_test (size_t align, int c, size_t len)
 120 {
 121   align &= 63;
 122   if ((align + len) * sizeof (CHAR) > page_size)
 123     return;
 124
 125   printf ("Length %4zd, alignment %2zd, c %2d:", len, align, c);
 126
 127   FOR_EACH_IMPL (impl, 0)
 128     do_one_test (impl, (CHAR *) (buf1) + align, c, len);
 129
 130   putchar ('\n');
 131 }
 132
 133 int
 134 test_main (void)
 135 {
 136   size_t i;
 137   int c = 0;
 138
 139   test_init ();
 140
 141   printf ("%24s", "");
 142   FOR_EACH_IMPL (impl, 0)
 143     printf ("\t%s", impl->name);
 144   putchar ('\n');
 145
 146 #ifndef TEST_BZERO
 147   for (c = -65; c <= 130; c += 65)
 148 #endif
 149     {
 150       for (i = 0; i < 18; ++i)
 151         do_test (0, c, 1 << i);
 152       for (i = 1; i < 32; ++i)
 153         {
 154           do_test (i, c, i);
 155           if (i & (i - 1))
 156             do_test (0, c, i);
 157         }
 158       for (i = 32; i < 512; i+=32)
 159         {
 160           do_test (0, c, i);
 161           do_test (i, c, i);
 162         }
 163       do_test (1, c, 14);
 164       do_test (3, c, 1024);
 165       do_test (4, c, 64);
 166       do_test (2, c, 25);
 167     }
 168   for (i = 33; i <= 256; i += 4)
 169     {
 170       do_test (0, c, 32 * i);
 171       do_test (i, c, 32 * i);
 172     }
 173
 174   return ret;
 175 }
 176
 177 #include <support/test-driver.c>