benchtests/bench-memset.c

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