benchtests/bench-memset.c

   1 /* Measure memset 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 #define TEST_MAIN
  20 #ifdef TEST_BZERO
  21 # define TEST_NAME "bzero"
  22 #else
  23 # ifndef WIDE
  24 #  define TEST_NAME "memset"
  25 # else
  26 #  define TEST_NAME "wmemset"
  27 # endif /* WIDE */
  28 #endif /* !TEST_BZERO */
  29 #define MIN_PAGE_SIZE 131072
  30 #include "bench-string.h"
  31
  32 #ifndef WIDE
  33 # define MEMSET memset
  34 # define CHAR char
  35 # define SIMPLE_MEMSET simple_memset
  36 # define MEMCMP memcmp
  37 #else
  38 # include <wchar.h>
  39 # define MEMSET wmemset
  40 # define CHAR wchar_t
  41 # define SIMPLE_MEMSET simple_wmemset
  42 # define MEMCMP wmemcmp
  43 #endif /* WIDE */
  44
  45 #include "json-lib.h"
  46
  47 CHAR *SIMPLE_MEMSET (CHAR *, int, size_t);
  48
  49 #ifdef TEST_BZERO
  50 typedef void (*proto_t) (char *, size_t);
  51 void simple_bzero (char *, size_t);
  52 void builtin_bzero (char *, size_t);
  53
  54 IMPL (simple_bzero, 0)
  55 IMPL (builtin_bzero, 0)
  56 IMPL (bzero, 1)
  57
  58 void
  59 simple_bzero (char *s, size_t n)
  60 {
  61   SIMPLE_MEMSET (s, 0, n);
  62 }
  63
  64 void
  65 builtin_bzero (char *s, size_t n)
  66 {
  67   __builtin_bzero (s, n);
  68 }
  69 #else
  70 typedef CHAR *(*proto_t) (CHAR *, int, size_t);
  71
  72 IMPL (SIMPLE_MEMSET, 0)
  73 # ifndef WIDE
  74 char *builtin_memset (char *, int, size_t);
  75 IMPL (builtin_memset, 0)
  76 # endif /* !WIDE */
  77 IMPL (MEMSET, 1)
  78
  79 # ifndef WIDE
  80 char *
  81 builtin_memset (char *s, int c, size_t n)
  82 {
  83   return __builtin_memset (s, c, n);
  84 }
  85 # endif /* !WIDE */
  86 #endif /* !TEST_BZERO */
  87
  88 CHAR *
  89 inhibit_loop_to_libcall
  90 SIMPLE_MEMSET (CHAR *s, int c, size_t n)
  91 {
  92   CHAR *r = s, *end = s + n;
  93   while (r < end)
  94     *r++ = c;
  95   return s;
  96 }
  97
  98 static void
  99 do_one_test (json_ctx_t *json_ctx, impl_t *impl, CHAR *s,
 100              int c __attribute ((unused)), size_t n)
 101 {
 102   size_t i, iters = INNER_LOOP_ITERS;
 103   timing_t start, stop, cur;
 104
 105   TIMING_NOW (start);
 106   for (i = 0; i < iters; ++i)
 107     {
 108 #ifdef TEST_BZERO
 109       CALL (impl, s, n);
 110 #else
 111       CALL (impl, s, c, n);
 112 #endif /* !TEST_BZERO */
 113     }
 114   TIMING_NOW (stop);
 115
 116   TIMING_DIFF (cur, start, stop);
 117
 118   json_element_double (json_ctx, (double) cur / (double) iters);
 119 }
 120
 121 static void
 122 do_test (json_ctx_t *json_ctx, size_t align, int c, size_t len)
 123 {
 124   align &= 63;
 125   if ((align + len) * sizeof (CHAR) > page_size)
 126     return;
 127
 128   json_element_object_begin (json_ctx);
 129   json_attr_uint (json_ctx, "length", len);
 130   json_attr_uint (json_ctx, "alignment", align);
 131   json_attr_int (json_ctx, "char", c);
 132   json_array_begin (json_ctx, "timings");
 133
 134   FOR_EACH_IMPL (impl, 0)
 135     {
 136       do_one_test (json_ctx, impl, (CHAR *) (buf1) + align, c, len);
 137       realloc_bufs ();
 138     }
 139
 140   json_array_end (json_ctx);
 141   json_element_object_end (json_ctx);
 142 }
 143
 144 int
 145 test_main (void)
 146 {
 147   json_ctx_t json_ctx;
 148   size_t i;
 149   int c = 0;
 150
 151   test_init ();
 152
 153   json_init (&json_ctx, 0, stdout);
 154
 155   json_document_begin (&json_ctx);
 156   json_attr_string (&json_ctx, "timing_type", TIMING_TYPE);
 157
 158   json_attr_object_begin (&json_ctx, "functions");
 159   json_attr_object_begin (&json_ctx, TEST_NAME);
 160   json_attr_string (&json_ctx, "bench-variant", "");
 161
 162   json_array_begin (&json_ctx, "ifuncs");
 163   FOR_EACH_IMPL (impl, 0)
 164     json_element_string (&json_ctx, impl->name);
 165   json_array_end (&json_ctx);
 166
 167   json_array_begin (&json_ctx, "results");
 168
 169 #ifndef TEST_BZERO
 170   for (c = -65; c <= 130; c += 65)
 171 #endif
 172     {
 173       for (i = 0; i < 18; ++i)
 174         do_test (&json_ctx, 0, c, 1 << i);
 175       for (i = 1; i < 32; ++i)
 176         {
 177           do_test (&json_ctx, i, c, i);
 178           if (i & (i - 1))
 179             do_test (&json_ctx, 0, c, i);
 180         }
 181       for (i = 32; i < 512; i+=32)
 182         {
 183           do_test (&json_ctx, 0, c, i);
 184           do_test (&json_ctx, i, c, i);
 185         }
 186       do_test (&json_ctx, 1, c, 14);
 187       do_test (&json_ctx, 3, c, 1024);
 188       do_test (&json_ctx, 4, c, 64);
 189       do_test (&json_ctx, 2, c, 25);
 190     }
 191   for (i = 33; i <= 256; i += 4)
 192     {
 193       do_test (&json_ctx, 0, c, 32 * i);
 194       do_test (&json_ctx, i, c, 32 * i);
 195     }
 196
 197   json_array_end (&json_ctx);
 198   json_attr_object_end (&json_ctx);
 199   json_attr_object_end (&json_ctx);
 200   json_document_end (&json_ctx);
 201
 202   return ret;
 203 }
 204
 205 #include <support/test-driver.c>