benchtests/bench-memmove.c

   1 /* Measure memmove functions.
   2    Copyright (C) 2013 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   memcpy (src, orig_src, len);
  71 #ifdef TEST_BCOPY
  72   CALL (impl, src, dst, len);
  73 #else
  74   char *res;
  75
  76   res = CALL (impl, dst, src, len);
  77   if (res != dst)
  78     {
  79       error (0, 0, "Wrong result in function %s %p %p", impl->name,
  80              res, dst);
  81       ret = 1;
  82       return;
  83     }
  84 #endif
  85
  86   if (memcmp (dst, orig_src, len) != 0)
  87     {
  88       error (0, 0, "Wrong result in function %s dst \"%s\" src \"%s\"",
  89              impl->name, dst, src);
  90       ret = 1;
  91       return;
  92     }
  93
  94   if (HP_TIMING_AVAIL)
  95     {
  96       hp_timing_t start __attribute ((unused));
  97       hp_timing_t stop __attribute ((unused));
  98       hp_timing_t best_time = ~ (hp_timing_t) 0;
  99       size_t i;
 100
 101       for (i = 0; i < 32; ++i)
 102         {
 103           HP_TIMING_NOW (start);
 104 #ifdef TEST_BCOPY
 105           CALL (impl, src, dst, len);
 106 #else
 107           CALL (impl, dst, src, len);
 108 #endif
 109           HP_TIMING_NOW (stop);
 110           HP_TIMING_BEST (best_time, start, stop);
 111         }
 112
 113       printf ("\t%zd", (size_t) best_time);
 114     }
 115 }
 116
 117 static void
 118 do_test (size_t align1, size_t align2, size_t len)
 119 {
 120   size_t i, j;
 121   char *s1, *s2;
 122
 123   align1 &= 63;
 124   if (align1 + len >= page_size)
 125     return;
 126
 127   align2 &= 63;
 128   if (align2 + len >= page_size)
 129     return;
 130
 131   s1 = (char *) (buf1 + align1);
 132   s2 = (char *) (buf2 + align2);
 133
 134   for (i = 0, j = 1; i < len; i++, j += 23)
 135     s1[i] = j;
 136
 137   if (HP_TIMING_AVAIL)
 138     printf ("Length %4zd, alignment %2zd/%2zd:", len, align1, align2);
 139
 140   FOR_EACH_IMPL (impl, 0)
 141     do_one_test (impl, s2, (char *) (buf2 + align1), s1, len);
 142
 143   if (HP_TIMING_AVAIL)
 144     putchar ('\n');
 145 }
 146
 147 int
 148 test_main (void)
 149 {
 150   size_t i;
 151
 152   test_init ();
 153
 154   printf ("%23s", "");
 155   FOR_EACH_IMPL (impl, 0)
 156     printf ("\t%s", impl->name);
 157   putchar ('\n');
 158
 159   for (i = 0; i < 14; ++i)
 160     {
 161       do_test (0, 32, 1 << i);
 162       do_test (32, 0, 1 << i);
 163       do_test (0, i, 1 << i);
 164       do_test (i, 0, 1 << i);
 165     }
 166
 167   for (i = 0; i < 32; ++i)
 168     {
 169       do_test (0, 32, i);
 170       do_test (32, 0, i);
 171       do_test (0, i, i);
 172       do_test (i, 0, i);
 173     }
 174
 175   for (i = 3; i < 32; ++i)
 176     {
 177       if ((i & (i - 1)) == 0)
 178         continue;
 179       do_test (0, 32, 16 * i);
 180       do_test (32, 0, 16 * i);
 181       do_test (0, i, 16 * i);
 182       do_test (i, 0, 16 * i);
 183     }
 184
 185   return ret;
 186 }
 187
 188 #include "../test-skeleton.c"