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   TIMING_NOW (start);
  61   for (i = 0; i < iters; ++i)
  62     {
  63       CALL (impl, dst, src, len);
  64     }
  65   TIMING_NOW (stop);
  66
  67   TIMING_DIFF (cur, start, stop);
  68
  69   json_element_double (json_ctx, (double) cur / (double) iters);
  70 }
  71
  72 static void
  73 do_test (json_ctx_t *json_ctx, size_t align1, size_t align2, size_t len)
  74 {
  75   size_t i, j;
  76   char *s1, *s2;
  77
  78   align1 &= 63;
  79   if (align1 + len >= page_size)
  80     return;
  81
  82   align2 &= 63;
  83   if (align2 + len >= page_size)
  84     return;
  85
  86   s1 = (char *) (buf1 + align1);
  87   s2 = (char *) (buf2 + align2);
  88
  89   for (i = 0, j = 1; i < len; i++, j += 23)
  90     s1[i] = j;
  91
  92   json_element_object_begin (json_ctx);
  93   json_attr_uint (json_ctx, "length", (double) len);
  94   json_attr_uint (json_ctx, "align1", (double) align1);
  95   json_attr_uint (json_ctx, "align2", (double) align2);
  96   json_array_begin (json_ctx, "timings");
  97
  98   FOR_EACH_IMPL (impl, 0)
  99     do_one_test (json_ctx, impl, s2, s1, len);
 100
 101   json_array_end (json_ctx);
 102   json_element_object_end (json_ctx);
 103 }
 104
 105 int
 106 test_main (void)
 107 {
 108   json_ctx_t json_ctx;
 109   size_t i;
 110
 111   test_init ();
 112
 113   json_init (&json_ctx, 0, stdout);
 114
 115   json_document_begin (&json_ctx);
 116   json_attr_string (&json_ctx, "timing_type", TIMING_TYPE);
 117
 118   json_attr_object_begin (&json_ctx, "functions");
 119   json_attr_object_begin (&json_ctx, TEST_NAME);
 120   json_attr_string (&json_ctx, "bench-variant", "default");
 121
 122   json_array_begin (&json_ctx, "ifuncs");
 123   FOR_EACH_IMPL (impl, 0)
 124     json_element_string (&json_ctx, impl->name);
 125   json_array_end (&json_ctx);
 126
 127   json_array_begin (&json_ctx, "results");
 128   for (i = 0; i < 18; ++i)
 129     {
 130       do_test (&json_ctx, 0, 0, 1 << i);
 131       do_test (&json_ctx, i, 0, 1 << i);
 132       do_test (&json_ctx, 0, i, 1 << i);
 133       do_test (&json_ctx, i, i, 1 << i);
 134     }
 135
 136   for (i = 0; i < 32; ++i)
 137     {
 138       do_test (&json_ctx, 0, 0, i);
 139       do_test (&json_ctx, i, 0, i);
 140       do_test (&json_ctx, 0, i, i);
 141       do_test (&json_ctx, i, i, i);
 142     }
 143
 144   for (i = 3; i < 32; ++i)
 145     {
 146       if ((i & (i - 1)) == 0)
 147         continue;
 148       do_test (&json_ctx, 0, 0, 16 * i);
 149       do_test (&json_ctx, i, 0, 16 * i);
 150       do_test (&json_ctx, 0, i, 16 * i);
 151       do_test (&json_ctx, i, i, 16 * i);
 152     }
 153
 154   for (i = 32; i < 64; ++i)
 155     {
 156       do_test (&json_ctx, 0, 0, 32 * i);
 157       do_test (&json_ctx, i, 0, 32 * i);
 158       do_test (&json_ctx, 0, i, 32 * i);
 159       do_test (&json_ctx, i, i, 32 * i);
 160     }
 161
 162   do_test (&json_ctx, 0, 0, getpagesize ());
 163
 164   json_array_end (&json_ctx);
 165   json_attr_object_end (&json_ctx);
 166   json_attr_object_end (&json_ctx);
 167   json_document_end (&json_ctx);
 168
 169   return ret;
 170 }
 171
 172 #include <support/test-driver.c>