benchtests/bench-strcpy.c

   1 /* Measure strcpy 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 #define BIG_CHAR MAX_CHAR
  20
  21 #ifdef WIDE
  22 # define sfmt "ls"
  23 # define SMALL_CHAR 1273
  24 #else
  25 # define sfmt "s"
  26 # define SMALL_CHAR 127
  27 #endif
  28
  29 #include "json-lib.h"
  30
  31 #ifndef STRCPY_RESULT
  32 # define STRCPY_RESULT(dst, len) dst
  33 # define TEST_MAIN
  34 # ifndef WIDE
  35 #   define TEST_NAME "strcpy"
  36 # else
  37 #   define TEST_NAME "wcscpy"
  38 #   define generic_strcpy generic_wcscpy
  39 # endif
  40 # include "bench-string.h"
  41
  42 CHAR *
  43 generic_strcpy (CHAR *dst, const CHAR *src)
  44 {
  45   return MEMCPY (dst, src, STRLEN (src) + 1);
  46 }
  47
  48 IMPL (STRCPY, 1)
  49 IMPL (generic_strcpy, 0)
  50
  51 #endif
  52
  53 typedef CHAR *(*proto_t) (CHAR *, const CHAR *);
  54
  55 static void
  56 do_one_test (json_ctx_t *json_ctx, impl_t *impl, CHAR *dst, const CHAR *src,
  57              size_t len __attribute__ ((unused)))
  58 {
  59   size_t i, iters = INNER_LOOP_ITERS;
  60   timing_t start, stop, cur;
  61
  62   if (CALL (impl, dst, src) != STRCPY_RESULT (dst, len))
  63     {
  64       error (0, 0, "Wrong result in function %s %p %p", impl->name,
  65              CALL (impl, dst, src), STRCPY_RESULT (dst, len));
  66       ret = 1;
  67       return;
  68     }
  69
  70   if (STRCMP (dst, src) != 0)
  71     {
  72       error (0, 0,
  73              "Wrong result in function %s dst \"%" sfmt "\" src \"%" sfmt "\"",
  74              impl->name, dst, src);
  75       ret = 1;
  76       return;
  77     }
  78
  79   TIMING_NOW (start);
  80   for (i = 0; i < iters; ++i)
  81     {
  82       CALL (impl, dst, src);
  83     }
  84   TIMING_NOW (stop);
  85
  86   TIMING_DIFF (cur, start, stop);
  87
  88   json_element_double (json_ctx, (double) cur / (double) iters);
  89 }
  90
  91 static void
  92 do_test (json_ctx_t *json_ctx, size_t align1, size_t align2, size_t len,
  93          int max_char)
  94 {
  95   size_t i;
  96   CHAR *s1, *s2;
  97   /* For wcscpy: align1 and align2 here mean alignment not in bytes,
  98      but in wchar_ts, in bytes it will equal to align * (sizeof (wchar_t))
  99      len for wcschr here isn't in bytes but it's number of wchar_t symbols.  */
 100   align1 &= 7;
 101   if ((align1 + len) * sizeof (CHAR) >= page_size)
 102     return;
 103
 104   align2 &= 7;
 105   if ((align2 + len) * sizeof (CHAR) >= page_size)
 106     return;
 107
 108   s1 = (CHAR *) (buf1) + align1;
 109   s2 = (CHAR *) (buf2) + align2;
 110
 111   for (i = 0; i < len; i++)
 112     s1[i] = 32 + 23 * i % (max_char - 32);
 113   s1[len] = 0;
 114
 115   json_element_object_begin (json_ctx);
 116   json_attr_uint (json_ctx, "align1", align1);
 117   json_attr_uint (json_ctx, "align2", align2);
 118   json_attr_uint (json_ctx, "len", len);
 119   json_attr_uint (json_ctx, "max_char", max_char);
 120
 121   json_array_begin (json_ctx, "timings");
 122
 123   FOR_EACH_IMPL (impl, 0)
 124     do_one_test (json_ctx, impl, s2, s1, len);
 125
 126   json_array_end (json_ctx);
 127   json_element_object_end (json_ctx);
 128 }
 129
 130 int
 131 test_main (void)
 132 {
 133   json_ctx_t json_ctx;
 134   size_t i;
 135
 136   test_init ();
 137
 138   json_init (&json_ctx, 0, stdout);
 139
 140   json_document_begin (&json_ctx);
 141   json_attr_string (&json_ctx, "timing_type", TIMING_TYPE);
 142
 143   json_attr_object_begin (&json_ctx, "functions");
 144   json_attr_object_begin (&json_ctx, TEST_NAME);
 145   json_attr_string (&json_ctx, "bench-variant", "");
 146
 147   json_array_begin (&json_ctx, "ifuncs");
 148   FOR_EACH_IMPL (impl, 0)
 149     json_element_string (&json_ctx, impl->name);
 150   json_array_end (&json_ctx);
 151
 152   json_array_begin (&json_ctx, "results");
 153
 154   for (i = 0; i < 16; ++i)
 155     {
 156       do_test (&json_ctx, 0, 0, i, SMALL_CHAR);
 157       do_test (&json_ctx, 0, 0, i, BIG_CHAR);
 158       do_test (&json_ctx, 0, i, i, SMALL_CHAR);
 159       do_test (&json_ctx, i, 0, i, BIG_CHAR);
 160     }
 161
 162   for (i = 1; i < 8; ++i)
 163     {
 164       do_test (&json_ctx, 0, 0, 8 << i, SMALL_CHAR);
 165       do_test (&json_ctx, 8 - i, 2 * i, 8 << i, SMALL_CHAR);
 166     }
 167
 168   for (i = 1; i < 8; ++i)
 169     {
 170       do_test (&json_ctx, i, 2 * i, 8 << i, SMALL_CHAR);
 171       do_test (&json_ctx, 2 * i, i, 8 << i, BIG_CHAR);
 172       do_test (&json_ctx, i, i, 8 << i, SMALL_CHAR);
 173       do_test (&json_ctx, i, i, 8 << i, BIG_CHAR);
 174     }
 175
 176   for (i = 16; i <= 512; i += 4)
 177     {
 178       do_test (&json_ctx, 0, 4, i, SMALL_CHAR);
 179       do_test (&json_ctx, 4, 0, i, BIG_CHAR);
 180       do_test (&json_ctx, 4, 4, i, SMALL_CHAR);
 181       do_test (&json_ctx, 2, 2, i, BIG_CHAR);
 182       do_test (&json_ctx, 2, 6, i, SMALL_CHAR);
 183       do_test (&json_ctx, 6, 2, i, BIG_CHAR);
 184       do_test (&json_ctx, 1, 7, i, SMALL_CHAR);
 185       do_test (&json_ctx, 7, 1, i, BIG_CHAR);
 186       do_test (&json_ctx, 3, 4, i, SMALL_CHAR);
 187       do_test (&json_ctx, 4, 3, i, BIG_CHAR);
 188       do_test (&json_ctx, 5, 7, i, SMALL_CHAR);
 189       do_test (&json_ctx, 7, 5, i, SMALL_CHAR);
 190     }
 191
 192   for (i = 1; i < 2048; i += i)
 193     {
 194       do_test (&json_ctx, 1, 0, i, SMALL_CHAR);
 195       do_test (&json_ctx, 0, i, i, SMALL_CHAR);
 196       do_test (&json_ctx, 0, 0, i, SMALL_CHAR);
 197       do_test (&json_ctx, i, i, i, SMALL_CHAR);
 198     }
 199
 200   json_array_end (&json_ctx);
 201   json_attr_object_end (&json_ctx);
 202   json_attr_object_end (&json_ctx);
 203   json_document_end (&json_ctx);
 204
 205   return ret;
 206 }
 207
 208 #include <support/test-driver.c>