benchtests/bench-strncat.c

   1 /* Measure strncat functions.
   2    Copyright (C) 2013-2023 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 #ifndef WIDE
  21 # define TEST_NAME "strncat"
  22 #else
  23 # define TEST_NAME "wcsncat"
  24 # define generic_strncat generic_wcsncat
  25 #endif /* WIDE */
  26 #include "bench-string.h"
  27
  28 #define BIG_CHAR MAX_CHAR
  29
  30 #ifndef WIDE
  31 # define SMALL_CHAR 127
  32 #else
  33 # define SMALL_CHAR 1273
  34 #endif /* WIDE */
  35
  36 #include "json-lib.h"
  37
  38 typedef CHAR *(*proto_t) (CHAR *, const CHAR *, size_t);
  39
  40 CHAR *
  41 generic_strncat (CHAR *dst, const CHAR *src, size_t n)
  42 {
  43   CHAR *end = dst + STRLEN (dst);
  44   n = STRNLEN (src, n);
  45   end[n] = 0;
  46   MEMCPY (end, src, n);
  47   return dst;
  48 }
  49
  50 IMPL (STRNCAT, 2)
  51 IMPL (generic_strncat, 0)
  52
  53 static void
  54 do_one_test (json_ctx_t *json_ctx, impl_t *impl, CHAR *dst, const CHAR *src,
  55              size_t n)
  56 {
  57   size_t k = STRLEN (dst), i, iters = INNER_LOOP_ITERS8;
  58   timing_t start, stop, cur;
  59
  60   if (CALL (impl, dst, src, n) != dst)
  61     {
  62       error (0, 0, "Wrong result in function %s %p != %p", impl->name,
  63              CALL (impl, dst, src, n), dst);
  64       ret = 1;
  65       return;
  66     }
  67
  68   size_t len = STRLEN (src);
  69   if (MEMCMP (dst + k, src, len + 1 > n ? n : len + 1) != 0)
  70     {
  71       error (0, 0, "Incorrect concatenation in function %s", impl->name);
  72       ret = 1;
  73       return;
  74     }
  75   if (n < len && dst[k + n] != '\0')
  76     {
  77       error (0, 0, "There is no zero in the end of output string in %s",
  78              impl->name);
  79       ret = 1;
  80       return;
  81     }
  82
  83   TIMING_NOW (start);
  84   for (i = 0; i < iters; ++i)
  85     {
  86       dst[k] = '\0';
  87       CALL (impl, dst, src, n);
  88     }
  89   TIMING_NOW (stop);
  90
  91   TIMING_DIFF (cur, start, stop);
  92
  93   json_element_double (json_ctx, (double) cur / (double) iters);
  94 }
  95
  96 static void
  97 do_test (json_ctx_t *json_ctx, size_t align1, size_t align2, size_t len1,
  98          size_t len2, size_t n, int max_char)
  99 {
 100   size_t i;
 101   CHAR *s1, *s2;
 102
 103   align1 &= 7;
 104   if ((align1 + len1) * sizeof (CHAR) >= page_size)
 105     return;
 106   if ((align1 + n) * sizeof (CHAR) > page_size)
 107     return;
 108   align2 &= 7;
 109   if ((align2 + len1 + len2) * sizeof (CHAR) >= page_size)
 110     return;
 111   if ((align2 + len1 + n) * sizeof (CHAR) > page_size)
 112     return;
 113   s1 = (CHAR *) (buf1) + align1;
 114   s2 = (CHAR *) (buf2) + align2;
 115
 116   for (i = 0; i < len1; ++i)
 117     s1[i] = 32 + 23 * i % (max_char - 32);
 118   s1[len1] = '\0';
 119
 120   for (i = 0; i < len2; i++)
 121     s2[i] = 32 + 23 * i % (max_char - 32);
 122
 123   json_element_object_begin (json_ctx);
 124   json_attr_uint (json_ctx, "align1", align1);
 125   json_attr_uint (json_ctx, "align2", align2);
 126   json_attr_uint (json_ctx, "len1", len1);
 127   json_attr_uint (json_ctx, "len2", len2);
 128   json_attr_uint (json_ctx, "n", n);
 129   json_attr_uint (json_ctx, "max_char", max_char);
 130
 131   json_array_begin (json_ctx, "timings");
 132
 133   FOR_EACH_IMPL (impl, 0)
 134     {
 135       s2[len2] = '\0';
 136       do_one_test (json_ctx, impl, s2, s1, n);
 137     }
 138
 139   json_array_end (json_ctx);
 140   json_element_object_end (json_ctx);
 141 }
 142
 143 int
 144 main (void)
 145 {
 146   json_ctx_t json_ctx;
 147   size_t i, n;
 148
 149   test_init ();
 150
 151   json_init (&json_ctx, 0, stdout);
 152
 153   json_document_begin (&json_ctx);
 154   json_attr_string (&json_ctx, "timing_type", TIMING_TYPE);
 155
 156   json_attr_object_begin (&json_ctx, "functions");
 157   json_attr_object_begin (&json_ctx, TEST_NAME);
 158   json_attr_string (&json_ctx, "bench-variant", "");
 159
 160   json_array_begin (&json_ctx, "ifuncs");
 161   FOR_EACH_IMPL (impl, 0)
 162     json_element_string (&json_ctx, impl->name);
 163   json_array_end (&json_ctx);
 164
 165   json_array_begin (&json_ctx, "results");
 166
 167   for (n = 2; n <= 2048; n *= 4)
 168     {
 169       do_test (&json_ctx, 0, 2, 2, 2, n, SMALL_CHAR);
 170       do_test (&json_ctx, 0, 0, 4, 4, n, SMALL_CHAR);
 171       do_test (&json_ctx, 4, 0, 4, 4, n, BIG_CHAR);
 172       do_test (&json_ctx, 0, 0, 8, 8, n, SMALL_CHAR);
 173       do_test (&json_ctx, 0, 8, 8, 8, n, SMALL_CHAR);
 174
 175       for (i = 1; i < 8; ++i)
 176         {
 177           do_test (&json_ctx, 0, 0, 8 << i, 8 << i, n, SMALL_CHAR);
 178           do_test (&json_ctx, 8 - i, 2 * i, 8 << i, 8 << i, n, SMALL_CHAR);
 179           do_test (&json_ctx, 0, 0, 8 << i, 2 << i, n, SMALL_CHAR);
 180           do_test (&json_ctx, 8 - i, 2 * i, 8 << i, 2 << i, n, SMALL_CHAR);
 181         }
 182
 183       for (i = 1; i < 8; ++i)
 184         {
 185           do_test (&json_ctx, i, 2 * i, 8 << i, 1, n, SMALL_CHAR);
 186           do_test (&json_ctx, 2 * i, i, 8 << i, 1, n, BIG_CHAR);
 187           do_test (&json_ctx, i, i, 8 << i, 10, n, SMALL_CHAR);
 188         }
 189     }
 190
 191   for (i = 128; i < 2048; i += i)
 192     {
 193       for (n = i - 64; n <= i + 64; n += 32)
 194         {
 195           do_test (&json_ctx, 1, 0, i, i, n, SMALL_CHAR);
 196           do_test (&json_ctx, 0, i, i, i, n, SMALL_CHAR);
 197           do_test (&json_ctx, 0, 0, i, i, n, SMALL_CHAR);
 198           do_test (&json_ctx, i, i, i, i, n, SMALL_CHAR);
 199           do_test (&json_ctx, 1, 0, i, n, i, SMALL_CHAR);
 200           do_test (&json_ctx, 0, i, i, n, i, SMALL_CHAR);
 201           do_test (&json_ctx, 0, 0, i, n, i, SMALL_CHAR);
 202           do_test (&json_ctx, i, i, i, n, i, SMALL_CHAR);
 203         }
 204     }
 205
 206   json_array_end (&json_ctx);
 207   json_attr_object_end (&json_ctx);
 208   json_attr_object_end (&json_ctx);
 209   json_document_end (&json_ctx);
 210
 211   return ret;
 212 }