benchtests/bench-memcpy.c

   1 /* Measure memcpy 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 #ifndef MEMCPY_RESULT
  20 # define MEMCPY_RESULT(dst, len) dst
  21 # define MIN_PAGE_SIZE 131072
  22 # define TEST_MAIN
  23 # define TEST_NAME "memcpy"
  24 # include "bench-string.h"
  25
  26 char *simple_memcpy (char *, const char *, size_t);
  27 char *builtin_memcpy (char *, const char *, size_t);
  28
  29 IMPL (simple_memcpy, 0)
  30 IMPL (builtin_memcpy, 0)
  31 IMPL (memcpy, 1)
  32
  33 char *
  34 simple_memcpy (char *dst, const char *src, size_t n)
  35 {
  36   char *ret = dst;
  37   while (n--)
  38     *dst++ = *src++;
  39   return ret;
  40 }
  41
  42 char *
  43 builtin_memcpy (char *dst, const char *src, size_t n)
  44 {
  45   return __builtin_memcpy (dst, src, n);
  46 }
  47 #endif
  48
  49 # include "json-lib.h"
  50
  51 typedef char *(*proto_t) (char *, const char *, size_t);
  52
  53 static void
  54 do_one_test (json_ctx_t *json_ctx, impl_t *impl, char *dst, const char *src,
  55              size_t len)
  56 {
  57   size_t i, iters = INNER_LOOP_ITERS;
  58   timing_t start, stop, cur;
  59
  60   /* Must clear the destination buffer set by the previous run.  */
  61   for (i = 0; i < len; i++)
  62     dst[i] = 0;
  63
  64   if (CALL (impl, dst, src, len) != MEMCPY_RESULT (dst, len))
  65     {
  66       error (0, 0, "Wrong result in function %s %p %p", impl->name,
  67              CALL (impl, dst, src, len), MEMCPY_RESULT (dst, len));
  68       ret = 1;
  69       return;
  70     }
  71
  72   if (memcmp (dst, src, len) != 0)
  73     {
  74       error (0, 0, "Wrong result in function %s dst \"%s\" src \"%s\"",
  75              impl->name, dst, src);
  76       ret = 1;
  77       return;
  78     }
  79
  80   TIMING_NOW (start);
  81   for (i = 0; i < iters; ++i)
  82     {
  83       CALL (impl, dst, src, len);
  84     }
  85   TIMING_NOW (stop);
  86
  87   TIMING_DIFF (cur, start, stop);
  88
  89   json_element_double (json_ctx, (double) cur / (double) iters);
  90 }
  91
  92 static void
  93 do_test (json_ctx_t *json_ctx, size_t align1, size_t align2, size_t len)
  94 {
  95   size_t i, j;
  96   char *s1, *s2;
  97
  98   align1 &= 63;
  99   if (align1 + len >= page_size)
 100     return;
 101
 102   align2 &= 63;
 103   if (align2 + len >= page_size)
 104     return;
 105
 106   s1 = (char *) (buf1 + align1);
 107   s2 = (char *) (buf2 + align2);
 108
 109   for (i = 0, j = 1; i < len; i++, j += 23)
 110     s1[i] = j;
 111
 112   json_element_object_begin (json_ctx);
 113   json_attr_uint (json_ctx, "length", (double) len);
 114   json_attr_uint (json_ctx, "align1", (double) align1);
 115   json_attr_uint (json_ctx, "align2", (double) align2);
 116   json_array_begin (json_ctx, "timings");
 117
 118   FOR_EACH_IMPL (impl, 0)
 119     do_one_test (json_ctx, impl, s2, s1, len);
 120
 121   json_array_end (json_ctx);
 122   json_element_object_end (json_ctx);
 123 }
 124
 125 int
 126 test_main (void)
 127 {
 128   json_ctx_t json_ctx;
 129   size_t i;
 130
 131   test_init ();
 132
 133   json_init (&json_ctx, 0, stdout);
 134
 135   json_document_begin (&json_ctx);
 136   json_attr_string (&json_ctx, "timing_type", TIMING_TYPE);
 137
 138   json_attr_object_begin (&json_ctx, "functions");
 139   json_attr_object_begin (&json_ctx, "memcpy");
 140   json_attr_string (&json_ctx, "bench-variant", "default");
 141
 142   json_array_begin (&json_ctx, "ifuncs");
 143   FOR_EACH_IMPL (impl, 0)
 144     json_element_string (&json_ctx, impl->name);
 145   json_array_end (&json_ctx);
 146
 147   json_array_begin (&json_ctx, "results");
 148   for (i = 0; i < 18; ++i)
 149     {
 150       do_test (&json_ctx, 0, 0, 1 << i);
 151       do_test (&json_ctx, i, 0, 1 << i);
 152       do_test (&json_ctx, 0, i, 1 << i);
 153       do_test (&json_ctx, i, i, 1 << i);
 154     }
 155
 156   for (i = 0; i < 32; ++i)
 157     {
 158       do_test (&json_ctx, 0, 0, i);
 159       do_test (&json_ctx, i, 0, i);
 160       do_test (&json_ctx, 0, i, i);
 161       do_test (&json_ctx, i, i, i);
 162     }
 163
 164   for (i = 3; i < 32; ++i)
 165     {
 166       if ((i & (i - 1)) == 0)
 167         continue;
 168       do_test (&json_ctx, 0, 0, 16 * i);
 169       do_test (&json_ctx, i, 0, 16 * i);
 170       do_test (&json_ctx, 0, i, 16 * i);
 171       do_test (&json_ctx, i, i, 16 * i);
 172     }
 173
 174   for (i = 32; i < 64; ++i)
 175     {
 176       do_test (&json_ctx, 0, 0, 32 * i);
 177       do_test (&json_ctx, i, 0, 32 * i);
 178       do_test (&json_ctx, 0, i, 32 * i);
 179       do_test (&json_ctx, i, i, 32 * i);
 180     }
 181
 182   do_test (&json_ctx, 0, 0, getpagesize ());
 183
 184   json_array_end (&json_ctx);
 185   json_attr_object_end (&json_ctx);
 186   json_attr_object_end (&json_ctx);
 187   json_document_end (&json_ctx);
 188
 189   return ret;
 190 }
 191
 192 #include <support/test-driver.c>