benchtests/bench-memmove-large.c

   1 /* Measure memmove 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 BASE_PAGE_SIZE (1024 * 1024)
  20 #define START_SIZE (4 * 1024)
  21 #define MIN_PAGE_SIZE (getpagesize () + 16 * 1024 * 1024)
  22 #define TEST_MAIN
  23 #define TEST_NAME "memmove"
  24 #define TIMEOUT (20 * 60)
  25 #include "bench-string.h"
  26
  27 IMPL (memmove, 1)
  28
  29 typedef char *(*proto_t) (char *, const char *, size_t);
  30
  31 static void
  32 do_one_test (impl_t *impl, char *dst, char *src, const char *orig_src,
  33              size_t len)
  34 {
  35   size_t i, iters = 16;
  36   timing_t start, stop, cur;
  37
  38   /* This also clears the destination buffer updated by the previous
  39      run.  */
  40   memcpy (src, orig_src, len);
  41
  42   char *res = CALL (impl, dst, src, len);
  43   if (res != dst)
  44     {
  45       error (0, 0, "Wrong result in function %s %p %p", impl->name,
  46              res, dst);
  47       ret = 1;
  48       return;
  49     }
  50
  51   if (memcmp (dst, orig_src, len) != 0)
  52     {
  53       error (0, 0, "Wrong result in function %s dst \"%s\" src \"%s\"",
  54              impl->name, dst, src);
  55       ret = 1;
  56       return;
  57     }
  58
  59   TIMING_NOW (start);
  60   for (i = 0; i < iters; ++i)
  61     {
  62       CALL (impl, dst, src, len);
  63     }
  64   TIMING_NOW (stop);
  65
  66   TIMING_DIFF (cur, start, stop);
  67
  68   TIMING_PRINT_MEAN ((double) cur, (double) iters);
  69 }
  70
  71 static void
  72 do_test (size_t align1, size_t align2, size_t len)
  73 {
  74   size_t i, j;
  75   char *s1, *s2;
  76
  77   align1 &= 127;
  78   if (align1 + len >= page_size)
  79     return;
  80
  81   align2 &= 127;
  82   if (align2 + len >= page_size)
  83     return;
  84
  85   s1 = (char *) (buf1 + align1);
  86   s2 = (char *) (buf2 + align2);
  87
  88   for (i = 0, j = 1; i < len; i++, j += 23)
  89     s1[i] = j;
  90
  91   printf ("Length %4zd, alignment %2zd/%2zd:", len, align1, align2);
  92
  93   FOR_EACH_IMPL (impl, 0)
  94     do_one_test (impl, s2, (char *) (buf2 + align1), s1, len);
  95
  96   putchar ('\n');
  97 }
  98
  99 int
 100 test_main (void)
 101 {
 102   size_t i;
 103
 104   test_init ();
 105
 106   printf ("%23s", "");
 107   FOR_EACH_IMPL (impl, 0)
 108     printf ("\t%s", impl->name);
 109   putchar ('\n');
 110
 111   for (i = START_SIZE; i <= MIN_PAGE_SIZE; i <<= 1)
 112     {
 113       do_test (0, 64, i + 7);
 114       do_test (0, 3, i + 15);
 115       do_test (3, 0, i + 31);
 116       do_test (3, 7, i + 63);
 117       do_test (9, 5, i + 127);
 118     }
 119
 120   return ret;
 121 }
 122
 123 #include <support/test-driver.c>