benchtests/bench-memmove.c

   1 /* Measure memmove 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_BCOPY
  21 # define TEST_NAME "bcopy"
  22 #else
  23 # define TEST_NAME "memmove"
  24 #endif
  25 #include "bench-string.h"
  26
  27 char *simple_memmove (char *, const char *, size_t);
  28
  29 #ifdef TEST_BCOPY
  30 typedef void (*proto_t) (const char *, char *, size_t);
  31 void simple_bcopy (const char *, char *, size_t);
  32
  33 IMPL (simple_bcopy, 0)
  34 IMPL (bcopy, 1)
  35
  36 void
  37 simple_bcopy (const char *src, char *dst, size_t n)
  38 {
  39   simple_memmove (dst, src, n);
  40 }
  41 #else
  42 typedef char *(*proto_t) (char *, const char *, size_t);
  43
  44 IMPL (simple_memmove, 0)
  45 IMPL (memmove, 1)
  46 #endif
  47
  48 char *
  49 inhibit_loop_to_libcall
  50 simple_memmove (char *dst, const char *src, size_t n)
  51 {
  52   char *ret = dst;
  53   if (src < dst)
  54     {
  55       dst += n;
  56       src += n;
  57       while (n--)
  58         *--dst = *--src;
  59     }
  60   else
  61     while (n--)
  62       *dst++ = *src++;
  63   return ret;
  64 }
  65
  66 static void
  67 do_one_test (impl_t *impl, char *dst, char *src, const char *orig_src,
  68              size_t len)
  69 {
  70   size_t i, iters = INNER_LOOP_ITERS;
  71   timing_t start, stop, cur;
  72
  73   /* This also clears the destination buffer set by the previous run.  */
  74   memcpy (src, orig_src, len);
  75 #ifdef TEST_BCOPY
  76   CALL (impl, src, dst, len);
  77 #else
  78   char *res;
  79
  80   res = CALL (impl, dst, src, len);
  81   if (res != dst)
  82     {
  83       error (0, 0, "Wrong result in function %s %p %p", impl->name,
  84              res, dst);
  85       ret = 1;
  86       return;
  87     }
  88 #endif
  89
  90   if (memcmp (dst, orig_src, len) != 0)
  91     {
  92       error (0, 0, "Wrong result in function %s dst \"%s\" src \"%s\"",
  93              impl->name, dst, src);
  94       ret = 1;
  95       return;
  96     }
  97
  98   TIMING_NOW (start);
  99   for (i = 0; i < iters; ++i)
 100     {
 101 #ifdef TEST_BCOPY
 102       CALL (impl, src, dst, len);
 103 #else
 104       CALL (impl, dst, src, len);
 105 #endif
 106     }
 107   TIMING_NOW (stop);
 108
 109   TIMING_DIFF (cur, start, stop);
 110
 111   TIMING_PRINT_MEAN ((double) cur, (double) iters);
 112 }
 113
 114 static void
 115 do_test (size_t align1, size_t align2, size_t len)
 116 {
 117   size_t i, j;
 118   char *s1, *s2;
 119
 120   align1 &= 63;
 121   if (align1 + len >= page_size)
 122     return;
 123
 124   align2 &= 63;
 125   if (align2 + len >= page_size)
 126     return;
 127
 128   s1 = (char *) (buf1 + align1);
 129   s2 = (char *) (buf2 + align2);
 130
 131   for (i = 0, j = 1; i < len; i++, j += 23)
 132     s1[i] = j;
 133
 134   printf ("Length %4zd, alignment %2zd/%2zd:", len, align1, align2);
 135
 136   FOR_EACH_IMPL (impl, 0)
 137     do_one_test (impl, s2, (char *) (buf2 + align1), s1, len);
 138
 139   putchar ('\n');
 140 }
 141
 142 static int
 143 test_main (void)
 144 {
 145   size_t i;
 146
 147   test_init ();
 148
 149   printf ("%23s", "");
 150   FOR_EACH_IMPL (impl, 0)
 151     printf ("\t%s", impl->name);
 152   putchar ('\n');
 153
 154   for (i = 0; i < 14; ++i)
 155     {
 156       do_test (0, 32, 1 << i);
 157       do_test (32, 0, 1 << i);
 158       do_test (0, i, 1 << i);
 159       do_test (i, 0, 1 << i);
 160     }
 161
 162   for (i = 0; i < 32; ++i)
 163     {
 164       do_test (0, 32, i);
 165       do_test (32, 0, i);
 166       do_test (0, i, i);
 167       do_test (i, 0, i);
 168     }
 169
 170   for (i = 3; i < 32; ++i)
 171     {
 172       if ((i & (i - 1)) == 0)
 173         continue;
 174       do_test (0, 32, 16 * i);
 175       do_test (32, 0, 16 * i);
 176       do_test (0, i, 16 * i);
 177       do_test (i, 0, 16 * i);
 178     }
 179
 180   for (i = 32; i < 64; ++i)
 181     {
 182       do_test (0, 0, 32 * i);
 183       do_test (i, 0, 32 * i);
 184       do_test (0, i, 32 * i);
 185       do_test (i, i, 32 * i);
 186     }
 187
 188   return ret;
 189 }
 190
 191 #include <support/test-driver.c>