benchtests/bench-memchr.c

   1 /* Measure memchr 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 #include "json-lib.h"
  20
  21 #ifndef WIDE
  22 # define SMALL_CHAR 127
  23 #else
  24 # define SMALL_CHAR 1273
  25 #endif /* WIDE */
  26
  27 #ifndef USE_AS_MEMRCHR
  28 # define TEST_MAIN
  29 # ifndef WIDE
  30 #  define TEST_NAME "memchr"
  31 # else
  32 #  define TEST_NAME "wmemchr"
  33 # endif /* WIDE */
  34 # include "bench-string.h"
  35
  36 typedef void *(*proto_t) (const void *, int, size_t);
  37
  38 void *
  39 generic_memchr (const void *, int, size_t);
  40
  41 IMPL (MEMCHR, 1)
  42
  43 # ifndef WIDE
  44 IMPL (generic_memchr, 0)
  45 # endif
  46
  47 #endif /* !USE_AS_MEMRCHR */
  48
  49
  50 static void
  51 do_one_test (json_ctx_t *json_ctx, impl_t *impl, const CHAR *s, int c,
  52              size_t n)
  53 {
  54   size_t i, iters = INNER_LOOP_ITERS8 / 2;
  55   timing_t start, stop, cur;
  56
  57   TIMING_NOW (start);
  58   for (i = 0; i < iters; ++i)
  59     {
  60       CALL (impl, s, c, n);
  61     }
  62   TIMING_NOW (stop);
  63
  64   TIMING_DIFF (cur, start, stop);
  65
  66   json_element_double (json_ctx, (double) cur / (double) iters);
  67 }
  68
  69 static void
  70 do_test (json_ctx_t *json_ctx, size_t align, size_t pos, size_t len,
  71          int seek_char, int invert_pos)
  72 {
  73   size_t i;
  74
  75   align &= getpagesize () - 1;
  76   if ((align + len) * sizeof (CHAR) >= page_size)
  77     return;
  78
  79   CHAR *buf = (CHAR *) (buf1);
  80
  81   for (i = 0; i < len; ++i)
  82     {
  83       buf[align + i] = 1 + 23 * i % SMALL_CHAR;
  84       if (buf[align + i] == seek_char)
  85         buf[align + i] = seek_char + 1;
  86     }
  87   buf[align + len] = 0;
  88
  89   if (pos < len)
  90     {
  91       if (invert_pos)
  92         buf[align + len - pos] = seek_char;
  93       else
  94         buf[align + pos] = seek_char;
  95       buf[align + len] = -seek_char;
  96     }
  97   else
  98     {
  99       buf[align + len] = seek_char;
 100     }
 101
 102   json_element_object_begin (json_ctx);
 103   json_attr_uint (json_ctx, "align", align);
 104   json_attr_uint (json_ctx, "pos", pos);
 105   json_attr_uint (json_ctx, "len", len);
 106   json_attr_uint (json_ctx, "seek_char", seek_char);
 107   json_attr_uint (json_ctx, "invert_pos", invert_pos);
 108
 109   json_array_begin (json_ctx, "timings");
 110
 111   FOR_EACH_IMPL (impl, 0)
 112     do_one_test (json_ctx, impl, (CHAR *) (buf + align), seek_char, len);
 113
 114   json_array_end (json_ctx);
 115   json_element_object_end (json_ctx);
 116 }
 117
 118 int
 119 test_main (void)
 120 {
 121   size_t i, j, al, al_max;
 122   int repeats;
 123   json_ctx_t json_ctx;
 124   test_init ();
 125
 126   json_init (&json_ctx, 0, stdout);
 127
 128   json_document_begin (&json_ctx);
 129   json_attr_string (&json_ctx, "timing_type", TIMING_TYPE);
 130
 131   json_attr_object_begin (&json_ctx, "functions");
 132   json_attr_object_begin (&json_ctx, TEST_NAME);
 133   json_attr_string (&json_ctx, "bench-variant", "");
 134
 135   json_array_begin (&json_ctx, "ifuncs");
 136   FOR_EACH_IMPL (impl, 0)
 137     json_element_string (&json_ctx, impl->name);
 138   json_array_end (&json_ctx);
 139
 140   json_array_begin (&json_ctx, "results");
 141
 142   al_max = 0;
 143 #ifdef USE_AS_MEMRCHR
 144   al_max = getpagesize () / 2;
 145 #endif
 146
 147   for (repeats = 0; repeats < 2; ++repeats)
 148     {
 149       for (al = 0; al <= al_max; al += getpagesize () / 2)
 150         {
 151           for (i = 1; i < 8; ++i)
 152             {
 153               do_test (&json_ctx, al, 16 << i, 2048, 23, repeats);
 154               do_test (&json_ctx, al + i, 64, 256, 23, repeats);
 155               do_test (&json_ctx, al, 16 << i, 2048, 0, repeats);
 156               do_test (&json_ctx, al + i, 64, 256, 0, repeats);
 157
 158               do_test (&json_ctx, al + getpagesize () - 15, 64, 256, 0,
 159                        repeats);
 160 #ifdef USE_AS_MEMRCHR
 161               /* Also test the position close to the beginning for memrchr.  */
 162               do_test (&json_ctx, al, i, 256, 23, repeats);
 163               do_test (&json_ctx, al, i, 256, 0, repeats);
 164               do_test (&json_ctx, al + i, i, 256, 23, repeats);
 165               do_test (&json_ctx, al + i, i, 256, 0, repeats);
 166 #endif
 167             }
 168           for (i = 1; i < 8; ++i)
 169             {
 170               do_test (&json_ctx, al + i, i << 5, 192, 23, repeats);
 171               do_test (&json_ctx, al + i, i << 5, 192, 0, repeats);
 172               do_test (&json_ctx, al + i, i << 5, 256, 23, repeats);
 173               do_test (&json_ctx, al + i, i << 5, 256, 0, repeats);
 174               do_test (&json_ctx, al + i, i << 5, 512, 23, repeats);
 175               do_test (&json_ctx, al + i, i << 5, 512, 0, repeats);
 176
 177               do_test (&json_ctx, al + getpagesize () - 15, i << 5, 256, 23,
 178                        repeats);
 179             }
 180         }
 181
 182       for (i = 1; i < 32; ++i)
 183         {
 184           do_test (&json_ctx, 0, i, i + 1, 23, repeats);
 185           do_test (&json_ctx, 0, i, i + 1, 0, repeats);
 186           do_test (&json_ctx, i, i, i + 1, 23, repeats);
 187           do_test (&json_ctx, i, i, i + 1, 0, repeats);
 188           do_test (&json_ctx, 0, i, i - 1, 23, repeats);
 189           do_test (&json_ctx, 0, i, i - 1, 0, repeats);
 190           do_test (&json_ctx, i, i, i - 1, 23, repeats);
 191           do_test (&json_ctx, i, i, i - 1, 0, repeats);
 192
 193           do_test (&json_ctx, getpagesize () / 2, i, i + 1, 23, repeats);
 194           do_test (&json_ctx, getpagesize () / 2, i, i + 1, 0, repeats);
 195           do_test (&json_ctx, getpagesize () / 2 + i, i, i + 1, 23, repeats);
 196           do_test (&json_ctx, getpagesize () / 2 + i, i, i + 1, 0, repeats);
 197           do_test (&json_ctx, getpagesize () / 2, i, i - 1, 23, repeats);
 198           do_test (&json_ctx, getpagesize () / 2, i, i - 1, 0, repeats);
 199           do_test (&json_ctx, getpagesize () / 2 + i, i, i - 1, 23, repeats);
 200           do_test (&json_ctx, getpagesize () / 2 + i, i, i - 1, 0, repeats);
 201
 202           do_test (&json_ctx, getpagesize () - 15, i, i - 1, 23, repeats);
 203           do_test (&json_ctx, getpagesize () - 15, i, i - 1, 0, repeats);
 204
 205           do_test (&json_ctx, getpagesize () - 15, i, i + 1, 23, repeats);
 206           do_test (&json_ctx, getpagesize () - 15, i, i + 1, 0, repeats);
 207
 208 #ifdef USE_AS_MEMRCHR
 209           do_test (&json_ctx, 0, 1, i + 1, 23, repeats);
 210           do_test (&json_ctx, 0, 2, i + 1, 0, repeats);
 211 #endif
 212         }
 213       for (al = 0; al <= al_max; al += getpagesize () / 2)
 214         {
 215           for (i = (16 / sizeof (CHAR)); i <= (8192 / sizeof (CHAR)); i += i)
 216             {
 217               for (j = 0; j <= (384 / sizeof (CHAR));
 218                    j += (32 / sizeof (CHAR)))
 219                 {
 220                   do_test (&json_ctx, al, i + j, i, 23, repeats);
 221                   do_test (&json_ctx, al, i, i + j, 23, repeats);
 222                   if (j < i)
 223                     {
 224                       do_test (&json_ctx, al, i - j, i, 23, repeats);
 225                       do_test (&json_ctx, al, i, i - j, 23, repeats);
 226                     }
 227                 }
 228             }
 229         }
 230
 231 #ifndef USE_AS_MEMRCHR
 232       break;
 233 #endif
 234     }
 235
 236   json_array_end (&json_ctx);
 237   json_attr_object_end (&json_ctx);
 238   json_attr_object_end (&json_ctx);
 239   json_document_end (&json_ctx);
 240
 241   return ret;
 242 }
 243
 244 #include <support/test-driver.c>
 245
 246 #ifndef WIDE
 247 # ifndef USE_AS_MEMRCHR
 248 #  undef MEMCHR
 249 #  define MEMCHR generic_memchr
 250 #  include <string/memchr.c>
 251 # else
 252 #  undef MEMRCHR
 253 #  define MEMRCHR generic_memrchr
 254 #  include <string/memrchr.c>
 255 # endif
 256 #endif