benchtests/bench-strrchr.c

   1 /* Measure STRCHR functions.
   2    Copyright (C) 2013-2022 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 #ifdef WIDE
  21 # define TEST_NAME "wcsrchr"
  22 #else
  23 # define TEST_NAME "strrchr"
  24 #endif
  25 #include "bench-string.h"
  26 #include "json-lib.h"
  27
  28 #define BIG_CHAR MAX_CHAR
  29
  30 #ifdef WIDE
  31 # define SIMPLE_STRRCHR simple_wcsrchr
  32 # define SMALL_CHAR 1273
  33 #else
  34 # define SIMPLE_STRRCHR simple_strrchr
  35 # define SMALL_CHAR 127
  36 #endif
  37
  38 typedef CHAR *(*proto_t) (const CHAR *, int);
  39 CHAR *SIMPLE_STRRCHR (const CHAR *, int);
  40
  41 IMPL (SIMPLE_STRRCHR, 0)
  42 IMPL (STRRCHR, 1)
  43
  44 CHAR *
  45 SIMPLE_STRRCHR (const CHAR *s, int c)
  46 {
  47   const CHAR *ret = NULL;
  48
  49   for (; *s != '\0'; ++s)
  50     if (*s == (CHAR) c)
  51       ret = s;
  52
  53   return (CHAR *) (c == '\0' ? s : ret);
  54 }
  55
  56 static void
  57 do_one_test (json_ctx_t *json_ctx, impl_t *impl, const CHAR *s, int c,
  58              CHAR *exp_res)
  59 {
  60   CHAR *res = CALL (impl, s, c);
  61   size_t i, iters = INNER_LOOP_ITERS8;
  62   timing_t start, stop, cur;
  63
  64   if (res != exp_res)
  65     {
  66       error (0, 0, "Wrong result in function %s %p %p", impl->name, res,
  67              exp_res);
  68       ret = 1;
  69       return;
  70     }
  71
  72   TIMING_NOW (start);
  73   for (i = 0; i < iters; ++i)
  74     {
  75       CALL (impl, s, c);
  76     }
  77   TIMING_NOW (stop);
  78   TIMING_DIFF (cur, start, stop);
  79
  80   json_element_double (json_ctx, (double) cur / (double) iters);
  81 }
  82
  83 static void
  84 do_test (json_ctx_t *json_ctx, size_t align, size_t pos, size_t len,
  85          int seek_char, int max_char, size_t freq)
  86 /* For wcsrchr: align here means align not in bytes,
  87    but in wchar_ts, in bytes it will equal to align * (sizeof (wchar_t))
  88    len for wcschr here isn't in bytes but it's number of wchar_t symbols.  */
  89 {
  90   size_t i;
  91   size_t pos_chunk_sz = freq ? (pos / freq) : pos;
  92   size_t last_pos = len;
  93   CHAR *result;
  94   CHAR *buf = (CHAR *) buf1;
  95
  96   align &= (getpagesize () - 1);
  97   if ((align + len) * sizeof (CHAR) >= page_size)
  98     return;
  99
 100   for (i = 0; i < len; ++i)
 101     {
 102       buf[align + i] = (random () * random ()) & max_char;
 103       if (!buf[align + i])
 104         buf[align + i] = (random () * random ()) & max_char;
 105       if (!buf[align + i])
 106         buf[align + i] = 1;
 107       if ((i > pos || pos >= len) && buf[align + i] == seek_char)
 108         buf[align + i] = seek_char + 10 + (random () & 15);
 109     }
 110
 111   if (pos_chunk_sz == 0 && pos)
 112     pos_chunk_sz = 1;
 113
 114   for (i = pos_chunk_sz; i < pos && i < len; i += pos_chunk_sz)
 115     {
 116       buf[align + i] = seek_char;
 117       last_pos = i;
 118     }
 119
 120   buf[align + len] = 0;
 121
 122   if (pos < len)
 123     {
 124       buf[align + pos] = seek_char;
 125       result = (CHAR *) (buf + align + pos);
 126     }
 127   else if (last_pos < len)
 128     result = (CHAR *) (buf + align + last_pos);
 129   else if (seek_char == 0)
 130     result = (CHAR *) (buf + align + len);
 131   else
 132     result = NULL;
 133
 134   json_element_object_begin (json_ctx);
 135   json_attr_uint (json_ctx, "len", len);
 136   json_attr_uint (json_ctx, "pos", pos);
 137   json_attr_uint (json_ctx, "align", align);
 138   json_attr_uint (json_ctx, "freq", freq);
 139   json_attr_uint (json_ctx, "seek", seek_char);
 140   json_attr_uint (json_ctx, "max_char", max_char);
 141   json_array_begin (json_ctx, "timings");
 142
 143   FOR_EACH_IMPL (impl, 0)
 144     do_one_test (json_ctx, impl, (CHAR *) (buf + align), seek_char, result);
 145
 146   json_array_end (json_ctx);
 147   json_element_object_end (json_ctx);
 148 }
 149
 150 int
 151 test_main (void)
 152 {
 153   json_ctx_t json_ctx;
 154   size_t i, j;
 155   int seek;
 156
 157   test_init ();
 158   json_init (&json_ctx, 0, stdout);
 159
 160   json_document_begin (&json_ctx);
 161   json_attr_string (&json_ctx, "timing_type", TIMING_TYPE);
 162
 163   json_attr_object_begin (&json_ctx, "functions");
 164   json_attr_object_begin (&json_ctx, TEST_NAME);
 165   json_attr_string (&json_ctx, "bench-variant", "");
 166
 167   json_array_begin (&json_ctx, "ifuncs");
 168   FOR_EACH_IMPL (impl, 0)
 169     json_element_string (&json_ctx, impl->name);
 170   json_array_end (&json_ctx);
 171
 172   json_array_begin (&json_ctx, "results");
 173
 174   for (seek = 0; seek <= 23; seek += 23)
 175     {
 176       for (j = 1; j < 32; j += j)
 177         {
 178           for (i = 1; i < 9; ++i)
 179             {
 180               do_test (&json_ctx, 0, 16 << i, 2048, seek, SMALL_CHAR, j);
 181               do_test (&json_ctx, i, 16 << i, 2048, seek, SMALL_CHAR, j);
 182             }
 183
 184           for (i = 1; i < 8; ++i)
 185             {
 186               do_test (&json_ctx, i, 64, 256, seek, SMALL_CHAR, j);
 187               do_test (&json_ctx, i, 64, 256, seek, BIG_CHAR, j);
 188
 189               do_test (&json_ctx, i * 15, 64, 256, seek, SMALL_CHAR, j);
 190               do_test (&json_ctx, i * 15, 64, 256, seek, BIG_CHAR, j);
 191             }
 192
 193           for (i = 0; i < 32; ++i)
 194             {
 195               do_test (&json_ctx, 0, i, i + 1, seek, SMALL_CHAR, j);
 196               do_test (&json_ctx, 0, i, i + 1, seek, BIG_CHAR, j);
 197               do_test (&json_ctx, getpagesize () - i / 2 - 1, i, i + 1, seek,
 198                        SMALL_CHAR, j);
 199             }
 200           if (seek == 0)
 201             {
 202               break;
 203             }
 204         }
 205     }
 206
 207   json_array_end (&json_ctx);
 208   json_attr_object_end (&json_ctx);
 209   json_attr_object_end (&json_ctx);
 210   json_document_end (&json_ctx);
 211
 212   return ret;
 213 }
 214
 215 #include <support/test-driver.c>