benchtests/bench-memcpy.c

   1 /* Measure memcpy functions.
   2    Copyright (C) 2013-2024 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 / 2;
  42   timing_t start, stop, cur;
  43   for (i = 0; i < iters / 64; ++i)
  44     {
  45       CALL (impl, dst, src, len);
  46     }
  47   TIMING_NOW (start);
  48   for (i = 0; i < iters; ++i)
  49     {
  50       CALL (impl, dst, src, len);
  51     }
  52   TIMING_NOW (stop);
  53
  54   TIMING_DIFF (cur, start, stop);
  55
  56   json_element_double (json_ctx, (double) cur / (double) iters);
  57 }
  58
  59 static void
  60 do_test (json_ctx_t *json_ctx, size_t align1, size_t align2, size_t len,
  61          int both_ways)
  62 {
  63   size_t i, j;
  64   char *s1, *s2;
  65   size_t repeats;
  66   align1 &= (getpagesize () - 1);
  67   if (align1 + len >= page_size)
  68     return;
  69
  70   align2 &= (getpagesize () - 1);
  71   if (align2 + len >= page_size)
  72     return;
  73
  74   s1 = (char *) (buf1 + align1);
  75   s2 = (char *) (buf2 + align2);
  76
  77   for (repeats = both_ways ? 2 : 1; repeats; --repeats)
  78     {
  79       for (i = 0, j = 1; i < len; i++, j += 23)
  80         s1[i] = j;
  81
  82       json_element_object_begin (json_ctx);
  83       json_attr_uint (json_ctx, "length", (double) len);
  84       json_attr_uint (json_ctx, "align1", (double) align1);
  85       json_attr_uint (json_ctx, "align2", (double) align2);
  86       json_attr_uint (json_ctx, "dst > src", (double) (s2 > s1));
  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       s1 = (char *) (buf2 + align1);
  96       s2 = (char *) (buf1 + align2);
  97     }
  98 }
  99
 100 int
 101 test_main (void)
 102 {
 103   json_ctx_t json_ctx;
 104   size_t i;
 105   size_t half_page = getpagesize () / 2;
 106   test_init ();
 107
 108   json_init (&json_ctx, 0, stdout);
 109
 110   json_document_begin (&json_ctx);
 111   json_attr_string (&json_ctx, "timing_type", TIMING_TYPE);
 112
 113   json_attr_object_begin (&json_ctx, "functions");
 114   json_attr_object_begin (&json_ctx, TEST_NAME);
 115   json_attr_string (&json_ctx, "bench-variant", "default");
 116
 117   json_array_begin (&json_ctx, "ifuncs");
 118   FOR_EACH_IMPL (impl, 0)
 119     json_element_string (&json_ctx, impl->name);
 120   json_array_end (&json_ctx);
 121
 122   json_array_begin (&json_ctx, "results");
 123   for (i = 0; i < 18; ++i)
 124     {
 125       do_test (&json_ctx, 0, 0, 1 << i, 1);
 126       do_test (&json_ctx, i, 0, 1 << i, 1);
 127       do_test (&json_ctx, i + 32, 0, 1 << i, 1);
 128       do_test (&json_ctx, 0, i, 1 << i, 1);
 129       do_test (&json_ctx, 0, i + 32, 1 << i, 1);
 130       do_test (&json_ctx, i, i, 1 << i, 1);
 131       do_test (&json_ctx, i + 32, i + 32, 1 << i, 1);
 132       do_test (&json_ctx, half_page, 0, 1 << i, 1);
 133       do_test (&json_ctx, half_page + i, 0, 1 << i, 1);
 134       do_test (&json_ctx, half_page, i, 1 << i, 1);
 135       do_test (&json_ctx, half_page + i, i, 1 << i, 1);
 136     }
 137
 138   for (i = 0; i < 32; ++i)
 139     {
 140       do_test (&json_ctx, 0, 0, i, 0);
 141       do_test (&json_ctx, i, 0, i, 0);
 142       do_test (&json_ctx, 0, i, i, 0);
 143       do_test (&json_ctx, i, i, i, 0);
 144       do_test (&json_ctx, half_page, 0, i, 0);
 145       do_test (&json_ctx, half_page + i, 0, i, 0);
 146       do_test (&json_ctx, half_page, i, i, 0);
 147       do_test (&json_ctx, half_page + i, i, i, 0);
 148       do_test (&json_ctx, getpagesize () - 1, 0, i, 0);
 149       do_test (&json_ctx, 0, getpagesize () - 1, i, 0);
 150     }
 151
 152   for (i = 3; i < 32; ++i)
 153     {
 154       if ((i & (i - 1)) == 0)
 155         continue;
 156       do_test (&json_ctx, 0, 0, 16 * i, 1);
 157       do_test (&json_ctx, i, 0, 16 * i, 1);
 158       do_test (&json_ctx, 0, i, 16 * i, 1);
 159       do_test (&json_ctx, i, i, 16 * i, 1);
 160       do_test (&json_ctx, half_page, 0, 16 * i, 1);
 161       do_test (&json_ctx, half_page + i, 0, 16 * i, 1);
 162       do_test (&json_ctx, half_page, i, 16 * i, 1);
 163       do_test (&json_ctx, half_page + i, i, 16 * i, 1);
 164     }
 165
 166   for (i = 32; i < 64; ++i)
 167     {
 168       do_test (&json_ctx, 0, 0, 32 * i, 1);
 169       do_test (&json_ctx, i, 0, 32 * i, 1);
 170       do_test (&json_ctx, 0, i, 32 * i, 1);
 171       do_test (&json_ctx, i, i, 32 * i, 1);
 172       do_test (&json_ctx, half_page, 0, 32 * i, 1);
 173       do_test (&json_ctx, half_page + i, 0, 32 * i, 1);
 174       do_test (&json_ctx, half_page, i, 32 * i, 1);
 175       do_test (&json_ctx, half_page + i, i, 32 * i, 1);
 176     }
 177
 178   do_test (&json_ctx, 0, 0, getpagesize (), 1);
 179
 180   for (i = 0; i <= 48; ++i)
 181     {
 182       do_test (&json_ctx, 0, 0, 2048 + 64 * i, 1);
 183       do_test (&json_ctx, i, 0, 2048 + 64 * i, 1);
 184       do_test (&json_ctx, i + 32, 0, 2048 + 64 * i, 1);
 185       do_test (&json_ctx, 0, i, 2048 + 64 * i, 1);
 186       do_test (&json_ctx, 0, i + 32, 2048 + 64 * i, 1);
 187       do_test (&json_ctx, i, i, 2048 + 64 * i, 1);
 188       do_test (&json_ctx, i + 32, i + 32, 2048 + 64 * i, 1);
 189       do_test (&json_ctx, half_page, 0, 2048 + 64 * i, 1);
 190       do_test (&json_ctx, half_page + i, 0, 2048 + 64 * i, 1);
 191       do_test (&json_ctx, half_page, i, 2048 + 64 * i, 1);
 192       do_test (&json_ctx, half_page + i, i, 2048 + 64 * i, 1);
 193       do_test (&json_ctx, i, 1, 2048 + 64 * i, 1);
 194       do_test (&json_ctx, 1, i, 2048 + 64 * i, 1);
 195       do_test (&json_ctx, i + 32, 1, 2048 + 64 * i, 1);
 196       do_test (&json_ctx, 1, i + 32, 2048 + 64 * i, 1);
 197       do_test (&json_ctx, half_page + i, 1, 2048 + 64 * i, 1);
 198       do_test (&json_ctx, half_page + 1, i, 2048 + 64 * i, 1);
 199     }
 200
 201   json_array_end (&json_ctx);
 202   json_attr_object_end (&json_ctx);
 203   json_attr_object_end (&json_ctx);
 204   json_document_end (&json_ctx);
 205
 206   return ret;
 207 }
 208
 209 #include <support/test-driver.c>
 210
 211 #define libc_hidden_builtin_def(X)
 212 #undef MEMCPY
 213 #define MEMCPY generic_memcpy
 214 #include <string/memcpy.c>
 215 #include <string/wordcopy.c>