benchtests/bench-memcpy.c

   1 /* Measure memcpy functions.
   2    Copyright (C) 2013-2019 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 *
  27 simple_memcpy (char *dst, const char *src, size_t n)
  28 {
  29   char *ret = dst;
  30   while (n--)
  31     *dst++ = *src++;
  32   return ret;
  33 }
  34
  35 IMPL (memcpy, 1)
  36 IMPL (simple_memcpy, 0)
  37
  38 #endif
  39
  40 # include "json-lib.h"
  41
  42 typedef char *(*proto_t) (char *, const char *, size_t);
  43
  44 static void
  45 do_one_test (json_ctx_t *json_ctx, impl_t *impl, char *dst, const char *src,
  46              size_t len)
  47 {
  48   size_t i, iters = INNER_LOOP_ITERS;
  49   timing_t start, stop, cur;
  50
  51   TIMING_NOW (start);
  52   for (i = 0; i < iters; ++i)
  53     {
  54       CALL (impl, dst, src, len);
  55     }
  56   TIMING_NOW (stop);
  57
  58   TIMING_DIFF (cur, start, stop);
  59
  60   json_element_double (json_ctx, (double) cur / (double) iters);
  61 }
  62
  63 static void
  64 do_test (json_ctx_t *json_ctx, size_t align1, size_t align2, size_t len)
  65 {
  66   size_t i, j;
  67   char *s1, *s2;
  68
  69   align1 &= 63;
  70   if (align1 + len >= page_size)
  71     return;
  72
  73   align2 &= 63;
  74   if (align2 + len >= page_size)
  75     return;
  76
  77   s1 = (char *) (buf1 + align1);
  78   s2 = (char *) (buf2 + align2);
  79
  80   for (i = 0, j = 1; i < len; i++, j += 23)
  81     s1[i] = j;
  82
  83   json_element_object_begin (json_ctx);
  84   json_attr_uint (json_ctx, "length", (double) len);
  85   json_attr_uint (json_ctx, "align1", (double) align1);
  86   json_attr_uint (json_ctx, "align2", (double) align2);
  87   json_array_begin (json_ctx, "timings");
  88
  89   FOR_EACH_IMPL (impl, 0)
  90     do_one_test (json_ctx, impl, s2, s1, len);
  91
  92   json_array_end (json_ctx);
  93   json_element_object_end (json_ctx);
  94 }
  95
  96 int
  97 test_main (void)
  98 {
  99   json_ctx_t json_ctx;
 100   size_t i;
 101
 102   test_init ();
 103
 104   json_init (&json_ctx, 0, stdout);
 105
 106   json_document_begin (&json_ctx);
 107   json_attr_string (&json_ctx, "timing_type", TIMING_TYPE);
 108
 109   json_attr_object_begin (&json_ctx, "functions");
 110   json_attr_object_begin (&json_ctx, TEST_NAME);
 111   json_attr_string (&json_ctx, "bench-variant", "default");
 112
 113   json_array_begin (&json_ctx, "ifuncs");
 114   FOR_EACH_IMPL (impl, 0)
 115     json_element_string (&json_ctx, impl->name);
 116   json_array_end (&json_ctx);
 117
 118   json_array_begin (&json_ctx, "results");
 119   for (i = 0; i < 18; ++i)
 120     {
 121       do_test (&json_ctx, 0, 0, 1 << i);
 122       do_test (&json_ctx, i, 0, 1 << i);
 123       do_test (&json_ctx, 0, i, 1 << i);
 124       do_test (&json_ctx, i, i, 1 << i);
 125     }
 126
 127   for (i = 0; i < 32; ++i)
 128     {
 129       do_test (&json_ctx, 0, 0, i);
 130       do_test (&json_ctx, i, 0, i);
 131       do_test (&json_ctx, 0, i, i);
 132       do_test (&json_ctx, i, i, i);
 133     }
 134
 135   for (i = 3; i < 32; ++i)
 136     {
 137       if ((i & (i - 1)) == 0)
 138         continue;
 139       do_test (&json_ctx, 0, 0, 16 * i);
 140       do_test (&json_ctx, i, 0, 16 * i);
 141       do_test (&json_ctx, 0, i, 16 * i);
 142       do_test (&json_ctx, i, i, 16 * i);
 143     }
 144
 145   for (i = 32; i < 64; ++i)
 146     {
 147       do_test (&json_ctx, 0, 0, 32 * i);
 148       do_test (&json_ctx, i, 0, 32 * i);
 149       do_test (&json_ctx, 0, i, 32 * i);
 150       do_test (&json_ctx, i, i, 32 * i);
 151     }
 152
 153   do_test (&json_ctx, 0, 0, getpagesize ());
 154
 155   json_array_end (&json_ctx);
 156   json_attr_object_end (&json_ctx);
 157   json_attr_object_end (&json_ctx);
 158   json_document_end (&json_ctx);
 159
 160   return ret;
 161 }
 162
 163 #include <support/test-driver.c>