benchtests/bench-strsep.c

   1 /* Measure strsep 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 TEST_MAIN
  20 #define TEST_NAME "strsep"
  21 #include "bench-string.h"
  22
  23 typedef char *(*proto_t) (const char **, const char *);
  24
  25 IMPL (strsep, 1)
  26
  27 static void
  28 do_one_test (impl_t * impl, const char *s1, const char *s2)
  29 {
  30   size_t i, iters = INNER_LOOP_ITERS;
  31   timing_t start, stop, cur;
  32
  33   TIMING_NOW (start);
  34   for (i = 0; i < iters; ++i)
  35     {
  36       const char *s1a = s1;
  37       CALL (impl, &s1a, s2);
  38       if (s1a != NULL)
  39         ((char*)s1a)[-1] = '1';
  40     }
  41   TIMING_NOW (stop);
  42
  43   TIMING_DIFF (cur, start, stop);
  44
  45   TIMING_PRINT_MEAN ((double) cur, (double) iters);
  46 }
  47
  48 static void
  49 do_test (size_t align1, size_t align2, size_t len1, size_t len2, int fail)
  50 {
  51   char *s2 = (char *) (buf2 + align2);
  52
  53   /* Search for a delimiter in a string containing mostly '0', so don't
  54      use '0' as a delimiter.  */
  55   static const char d[] = "123456789abcdefg";
  56 #define dl (sizeof (d) - 1)
  57   char *ss2 = s2;
  58   for (size_t l = len2; l > 0; l = l > dl ? l - dl : 0)
  59     {
  60       size_t t = l > dl ? dl : l;
  61       ss2 = mempcpy (ss2, d, t);
  62     }
  63   s2[len2] = '\0';
  64
  65   printf ("Length %4zd/%zd, alignment %2zd/%2zd, %s:",
  66           len1, len2, align1, align2, fail ? "fail" : "found");
  67
  68   FOR_EACH_IMPL (impl, 0)
  69   {
  70     char *s1 = (char *) (buf1 + align1);
  71     memset (s1, '0', len1);
  72     if (!fail)
  73       s1[len1 / 2] = '1';
  74     s1[len1] = '\0';
  75     do_one_test (impl, s1, s2);
  76   }
  77   putchar ('\n');
  78 }
  79
  80 static int
  81 test_main (void)
  82 {
  83   test_init ();
  84
  85   printf ("%23s", "");
  86   FOR_EACH_IMPL (impl, 0)
  87     printf ("\t%s", impl->name);
  88   putchar ('\n');
  89
  90   for (size_t klen = 2; klen < 32; ++klen)
  91     for (size_t hlen = 4 * klen; hlen < 8 * klen; hlen += klen)
  92       {
  93         do_test (0, 0, hlen, klen, 0);
  94         do_test (0, 0, hlen, klen, 1);
  95         do_test (0, 3, hlen, klen, 0);
  96         do_test (0, 3, hlen, klen, 1);
  97         do_test (0, 9, hlen, klen, 0);
  98         do_test (0, 9, hlen, klen, 1);
  99         do_test (0, 15, hlen, klen, 0);
 100         do_test (0, 15, hlen, klen, 1);
 101
 102         do_test (3, 0, hlen, klen, 0);
 103         do_test (3, 0, hlen, klen, 1);
 104         do_test (3, 3, hlen, klen, 0);
 105         do_test (3, 3, hlen, klen, 1);
 106         do_test (3, 9, hlen, klen, 0);
 107         do_test (3, 9, hlen, klen, 1);
 108         do_test (3, 15, hlen, klen, 0);
 109         do_test (3, 15, hlen, klen, 1);
 110
 111         do_test (9, 0, hlen, klen, 0);
 112         do_test (9, 0, hlen, klen, 1);
 113         do_test (9, 3, hlen, klen, 0);
 114         do_test (9, 3, hlen, klen, 1);
 115         do_test (9, 9, hlen, klen, 0);
 116         do_test (9, 9, hlen, klen, 1);
 117         do_test (9, 15, hlen, klen, 0);
 118         do_test (9, 15, hlen, klen, 1);
 119
 120         do_test (15, 0, hlen, klen, 0);
 121         do_test (15, 0, hlen, klen, 1);
 122         do_test (15, 3, hlen, klen, 0);
 123         do_test (15, 3, hlen, klen, 1);
 124         do_test (15, 9, hlen, klen, 0);
 125         do_test (15, 9, hlen, klen, 1);
 126         do_test (15, 15, hlen, klen, 0);
 127         do_test (15, 15, hlen, klen, 1);
 128       }
 129   do_test (0, 0, page_size - 1, 16, 0);
 130   do_test (0, 0, page_size - 1, 16, 1);
 131
 132   return ret;
 133 }
 134
 135 #include <support/test-driver.c>