benchtests/bench-memmove.c

   1 /* Measure memmove 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 #define TEST_MAIN
  20 #define TEST_NAME "memmove"
  21 #include "bench-string.h"
  22 #include "json-lib.h"
  23
  24 void *generic_memmove (void *, const void *, size_t);
  25
  26 typedef void *(*proto_t) (void *, const void *, size_t);
  27
  28 IMPL (memmove, 1)
  29 IMPL (generic_memmove, 0)
  30
  31 static void
  32 do_one_test (json_ctx_t *json_ctx, impl_t *impl, char *dst, char *src,
  33              size_t len)
  34 {
  35   size_t i, iters = INNER_LOOP_ITERS;
  36   timing_t start, stop, cur;
  37
  38   TIMING_NOW (start);
  39   for (i = 0; i < iters; ++i)
  40     {
  41       CALL (impl, dst, src, len);
  42     }
  43   TIMING_NOW (stop);
  44
  45   TIMING_DIFF (cur, start, stop);
  46
  47   json_element_double (json_ctx, (double) cur / (double) iters);
  48 }
  49
  50 static void
  51 do_test (json_ctx_t *json_ctx, size_t align1, size_t align2, size_t len)
  52 {
  53   size_t i, j;
  54   char *s1, *s2;
  55
  56   align1 &= 63;
  57   if (align1 + len >= page_size)
  58     return;
  59
  60   align2 &= 63;
  61   if (align2 + len >= page_size)
  62     return;
  63
  64   s1 = (char *) (buf2 + align1);
  65   s2 = (char *) (buf2 + align2);
  66
  67   for (i = 0, j = 1; i < len; i++, j += 23)
  68     s1[i] = j;
  69
  70   json_element_object_begin (json_ctx);
  71   json_attr_uint (json_ctx, "length", (double) len);
  72   json_attr_uint (json_ctx, "align1", (double) align1);
  73   json_attr_uint (json_ctx, "align2", (double) align2);
  74   json_array_begin (json_ctx, "timings");
  75
  76   FOR_EACH_IMPL (impl, 0)
  77     do_one_test (json_ctx, impl, s2, s1, len);
  78
  79   json_array_end (json_ctx);
  80   json_element_object_end (json_ctx);
  81 }
  82
  83 static int
  84 test_main (void)
  85 {
  86   json_ctx_t json_ctx;
  87   size_t i;
  88
  89   test_init ();
  90
  91   json_init (&json_ctx, 0, stdout);
  92
  93   json_document_begin (&json_ctx);
  94   json_attr_string (&json_ctx, "timing_type", TIMING_TYPE);
  95
  96   json_attr_object_begin (&json_ctx, "functions");
  97   json_attr_object_begin (&json_ctx, "memmove");
  98   json_attr_string (&json_ctx, "bench-variant", "default");
  99
 100   json_array_begin (&json_ctx, "ifuncs");
 101
 102   FOR_EACH_IMPL (impl, 0)
 103     json_element_string (&json_ctx, impl->name);
 104   json_array_end (&json_ctx);
 105
 106   json_array_begin (&json_ctx, "results");
 107   for (i = 0; i < 14; ++i)
 108     {
 109       do_test (&json_ctx, 0, 32, 1 << i);
 110       do_test (&json_ctx, 32, 0, 1 << i);
 111       do_test (&json_ctx, 0, i, 1 << i);
 112       do_test (&json_ctx, i, 0, 1 << i);
 113     }
 114
 115   for (i = 0; i < 32; ++i)
 116     {
 117       do_test (&json_ctx, 0, 32, i);
 118       do_test (&json_ctx, 32, 0, i);
 119       do_test (&json_ctx, 0, i, i);
 120       do_test (&json_ctx, i, 0, i);
 121     }
 122
 123   for (i = 3; i < 32; ++i)
 124     {
 125       if ((i & (i - 1)) == 0)
 126         continue;
 127       do_test (&json_ctx, 0, 32, 16 * i);
 128       do_test (&json_ctx, 32, 0, 16 * i);
 129       do_test (&json_ctx, 0, i, 16 * i);
 130       do_test (&json_ctx, i, 0, 16 * i);
 131     }
 132
 133   for (i = 32; i < 64; ++i)
 134     {
 135       do_test (&json_ctx, 0, 0, 32 * i);
 136       do_test (&json_ctx, i, 0, 32 * i);
 137       do_test (&json_ctx, 0, i, 32 * i);
 138       do_test (&json_ctx, i, i, 32 * i);
 139     }
 140
 141   json_array_end (&json_ctx);
 142   json_attr_object_end (&json_ctx);
 143   json_attr_object_end (&json_ctx);
 144   json_document_end (&json_ctx);
 145
 146   return ret;
 147 }
 148
 149 #include <support/test-driver.c>
 150
 151 #define libc_hidden_builtin_def(X)
 152 #undef MEMMOVE
 153 #define MEMMOVE generic_memmove
 154 #include <string/memmove.c>
 155 #include <string/wordcopy.c>