benchtests/bench-memcpy.c

   1 /* Measure memcpy functions.
   2    Copyright (C) 2013-2021 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    <https://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 void *generic_memcpy (void *, const void *, size_t);
  27
  28 IMPL (memcpy, 1)
  29 IMPL (generic_memcpy, 0)
  30
  31 #endif
  32
  33 # include "json-lib.h"
  34
  35 typedef void *(*proto_t) (void *, const void *, size_t);
  36
  37 static void
  38 do_one_test (json_ctx_t *json_ctx, impl_t *impl, char *dst, const char *src,
  39              size_t len)
  40 {
  41   size_t i, iters = INNER_LOOP_ITERS;
  42   timing_t start, stop, cur;
  43
  44   TIMING_NOW (start);
  45   for (i = 0; i < iters; ++i)
  46     {
  47       CALL (impl, dst, src, len);
  48     }
  49   TIMING_NOW (stop);
  50
  51   TIMING_DIFF (cur, start, stop);
  52
  53   json_element_double (json_ctx, (double) cur / (double) iters);
  54 }
  55
  56 static void
  57 do_test (json_ctx_t *json_ctx, size_t align1, size_t align2, size_t len)
  58 {
  59   size_t i, j;
  60   char *s1, *s2;
  61
  62   align1 &= 63;
  63   if (align1 + len >= page_size)
  64     return;
  65
  66   align2 &= 63;
  67   if (align2 + len >= page_size)
  68     return;
  69
  70   s1 = (char *) (buf1 + align1);
  71   s2 = (char *) (buf2 + align2);
  72
  73   for (i = 0, j = 1; i < len; i++, j += 23)
  74     s1[i] = j;
  75
  76   json_element_object_begin (json_ctx);
  77   json_attr_uint (json_ctx, "length", (double) len);
  78   json_attr_uint (json_ctx, "align1", (double) align1);
  79   json_attr_uint (json_ctx, "align2", (double) align2);
  80   json_array_begin (json_ctx, "timings");
  81
  82   FOR_EACH_IMPL (impl, 0)
  83     do_one_test (json_ctx, impl, s2, s1, len);
  84
  85   json_array_end (json_ctx);
  86   json_element_object_end (json_ctx);
  87 }
  88
  89 int
  90 test_main (void)
  91 {
  92   json_ctx_t json_ctx;
  93   size_t i;
  94
  95   test_init ();
  96
  97   json_init (&json_ctx, 0, stdout);
  98
  99   json_document_begin (&json_ctx);
 100   json_attr_string (&json_ctx, "timing_type", TIMING_TYPE);
 101
 102   json_attr_object_begin (&json_ctx, "functions");
 103   json_attr_object_begin (&json_ctx, TEST_NAME);
 104   json_attr_string (&json_ctx, "bench-variant", "default");
 105
 106   json_array_begin (&json_ctx, "ifuncs");
 107   FOR_EACH_IMPL (impl, 0)
 108     json_element_string (&json_ctx, impl->name);
 109   json_array_end (&json_ctx);
 110
 111   json_array_begin (&json_ctx, "results");
 112   for (i = 0; i < 18; ++i)
 113     {
 114       do_test (&json_ctx, 0, 0, 1 << i);
 115       do_test (&json_ctx, i, 0, 1 << i);
 116       do_test (&json_ctx, 0, i, 1 << i);
 117       do_test (&json_ctx, i, i, 1 << i);
 118     }
 119
 120   for (i = 0; i < 32; ++i)
 121     {
 122       do_test (&json_ctx, 0, 0, i);
 123       do_test (&json_ctx, i, 0, i);
 124       do_test (&json_ctx, 0, i, i);
 125       do_test (&json_ctx, i, i, i);
 126     }
 127
 128   for (i = 3; i < 32; ++i)
 129     {
 130       if ((i & (i - 1)) == 0)
 131         continue;
 132       do_test (&json_ctx, 0, 0, 16 * i);
 133       do_test (&json_ctx, i, 0, 16 * i);
 134       do_test (&json_ctx, 0, i, 16 * i);
 135       do_test (&json_ctx, i, i, 16 * i);
 136     }
 137
 138   for (i = 32; i < 64; ++i)
 139     {
 140       do_test (&json_ctx, 0, 0, 32 * i);
 141       do_test (&json_ctx, i, 0, 32 * i);
 142       do_test (&json_ctx, 0, i, 32 * i);
 143       do_test (&json_ctx, i, i, 32 * i);
 144     }
 145
 146   do_test (&json_ctx, 0, 0, getpagesize ());
 147
 148   json_array_end (&json_ctx);
 149   json_attr_object_end (&json_ctx);
 150   json_attr_object_end (&json_ctx);
 151   json_document_end (&json_ctx);
 152
 153   return ret;
 154 }
 155
 156 #include <support/test-driver.c>
 157
 158 #define libc_hidden_builtin_def(X)
 159 #undef MEMCPY
 160 #define MEMCPY generic_memcpy
 161 #include <string/memcpy.c>
 162 #include <string/wordcopy.c>