benchtests/bench-memset-large.c

   1 /* Measure memset functions with large data sizes.
   2    Copyright (C) 2016-2017 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 #ifndef WIDE
  21 # define TEST_NAME "memset"
  22 #else
  23 # define TEST_NAME "wmemset"
  24 #endif /* WIDE */
  25 #define START_SIZE (128 * 1024)
  26 #define MIN_PAGE_SIZE (getpagesize () + 64 * 1024 * 1024)
  27 #define TIMEOUT (20 * 60)
  28 #include "bench-string.h"
  29
  30 #ifndef WIDE
  31 # define MEMSET memset
  32 # define CHAR char
  33 # define SIMPLE_MEMSET simple_memset
  34 # define MEMCMP memcmp
  35 #else
  36 # include <wchar.h>
  37 # define MEMSET wmemset
  38 # define CHAR wchar_t
  39 # define SIMPLE_MEMSET simple_wmemset
  40 # define MEMCMP wmemcmp
  41 #endif /* WIDE */
  42
  43 #include <assert.h>
  44
  45 IMPL (MEMSET, 1)
  46
  47 typedef CHAR *(*proto_t) (CHAR *, int, size_t);
  48
  49 CHAR *
  50 inhibit_loop_to_libcall
  51 SIMPLE_MEMSET (CHAR *s, int c, size_t n)
  52 {
  53   CHAR *r = s, *end = s + n;
  54   while (r < end)
  55     *r++ = c;
  56   return s;
  57 }
  58
  59 static void
  60 do_one_test (impl_t *impl, CHAR *s, int c __attribute ((unused)), size_t n)
  61 {
  62   size_t i, iters = 16;
  63   timing_t start, stop, cur;
  64   CHAR *tstbuf = malloc (n * sizeof (*s));
  65   assert (tstbuf != NULL);
  66
  67   /* Must clear the destination buffer updated by the previous run.  */
  68   for (i = 0; i < n; i++)
  69     s[i] = 0;
  70
  71   CHAR *res = CALL (impl, s, c, n);
  72   if (res != s
  73       || SIMPLE_MEMSET (tstbuf, c, n) != tstbuf
  74       || MEMCMP (s, tstbuf, n) != 0)
  75     {
  76       error (0, 0, "Wrong result in function %s", impl->name);
  77       ret = 1;
  78       free (tstbuf);
  79       return;
  80     }
  81
  82   TIMING_NOW (start);
  83   for (i = 0; i < iters; ++i)
  84     {
  85       CALL (impl, s, c, n);
  86     }
  87   TIMING_NOW (stop);
  88
  89   TIMING_DIFF (cur, start, stop);
  90
  91   TIMING_PRINT_MEAN ((double) cur, (double) iters);
  92
  93   free (tstbuf);
  94 }
  95
  96 static void
  97 do_test (size_t align, int c, size_t len)
  98 {
  99   align &= 63;
 100   if ((align + len) * sizeof (CHAR) > page_size)
 101     return;
 102
 103   printf ("Length %4zd, alignment %2zd, c %2d:", len, align, c);
 104
 105   FOR_EACH_IMPL (impl, 0)
 106     do_one_test (impl, (CHAR *) (buf1) + align, c, len);
 107
 108   putchar ('\n');
 109 }
 110
 111 int
 112 test_main (void)
 113 {
 114   size_t i;
 115   int c;
 116
 117   test_init ();
 118
 119   printf ("%24s", "");
 120   FOR_EACH_IMPL (impl, 0)
 121     printf ("\t%s", impl->name);
 122   putchar ('\n');
 123
 124   c = 65;
 125   for (i = START_SIZE; i <= MIN_PAGE_SIZE; i <<= 1)
 126     {
 127       do_test (0, c, i);
 128       do_test (3, c, i);
 129     }
 130
 131   return ret;
 132 }
 133
 134 #include <support/test-driver.c>