benchtests/bench-strlen.c

   1 /* Measure STRLEN functions.
   2    Copyright (C) 2013-2020 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 "strlen"
  22 #else
  23 # define TEST_NAME "wcslen"
  24 # define generic_strlen generic_wcslen
  25 # define memchr_strlen wcschr_wcslen
  26 #endif
  27 #include "bench-string.h"
  28
  29 #include "json-lib.h"
  30
  31 typedef size_t (*proto_t) (const CHAR *);
  32
  33 size_t generic_strlen (const CHAR *);
  34 size_t memchr_strlen (const CHAR *);
  35
  36 IMPL (memchr_strlen, 0)
  37 IMPL (generic_strlen, 0)
  38
  39 size_t
  40 memchr_strlen (const CHAR *p)
  41 {
  42   return (const CHAR *)MEMCHR (p, 0, PTRDIFF_MAX) - p;
  43 }
  44
  45 IMPL (STRLEN, 1)
  46
  47
  48 static void
  49 do_one_test (json_ctx_t *json_ctx, impl_t *impl, const CHAR *s, size_t exp_len)
  50 {
  51   size_t len = CALL (impl, s), i, iters = INNER_LOOP_ITERS_LARGE;
  52   timing_t start, stop, cur;
  53
  54   if (len != exp_len)
  55     {
  56       error (0, 0, "Wrong result in function %s %zd %zd", impl->name,
  57              len, exp_len);
  58       ret = 1;
  59       return;
  60     }
  61
  62   TIMING_NOW (start);
  63   for (i = 0; i < iters; ++i)
  64     {
  65       CALL (impl, s);
  66     }
  67   TIMING_NOW (stop);
  68
  69   TIMING_DIFF (cur, start, stop);
  70
  71   json_element_double (json_ctx, (double) cur / (double) iters);
  72 }
  73
  74 static void
  75 do_test (json_ctx_t *json_ctx, size_t align, size_t len)
  76 {
  77   size_t i;
  78
  79   align &= 63;
  80   if (align + sizeof (CHAR) * len >= page_size)
  81     return;
  82
  83   json_element_object_begin (json_ctx);
  84   json_attr_uint (json_ctx, "length", len);
  85   json_attr_uint (json_ctx, "alignment", align);
  86   json_array_begin (json_ctx, "timings");
  87
  88
  89   FOR_EACH_IMPL (impl, 0)
  90     {
  91       CHAR *buf = (CHAR *) (buf1);
  92
  93       for (i = 0; i < len; ++i)
  94         buf[align + i] = 1 + 11111 * i % MAX_CHAR;
  95       buf[align + len] = 0;
  96
  97       do_one_test (json_ctx, impl, (CHAR *) (buf + align), len);
  98       alloc_bufs ();
  99     }
 100
 101   json_array_end (json_ctx);
 102   json_element_object_end (json_ctx);
 103 }
 104
 105 int
 106 test_main (void)
 107 {
 108   json_ctx_t json_ctx;
 109   size_t i;
 110
 111   test_init ();
 112
 113   json_init (&json_ctx, 0, stdout);
 114
 115   json_document_begin (&json_ctx);
 116   json_attr_string (&json_ctx, "timing_type", TIMING_TYPE);
 117
 118   json_attr_object_begin (&json_ctx, "functions");
 119   json_attr_object_begin (&json_ctx, TEST_NAME);
 120   json_attr_string (&json_ctx, "bench-variant", "");
 121
 122   json_array_begin (&json_ctx, "ifuncs");
 123   FOR_EACH_IMPL (impl, 0)
 124     json_element_string (&json_ctx, impl->name);
 125   json_array_end (&json_ctx);
 126
 127   json_array_begin (&json_ctx, "results");
 128   /* Checking with only 4 * N alignments for wcslen, other alignments are wrong for wchar_t type arrays*/
 129
 130   for (i = 1; i < 8; ++i)
 131   {
 132     do_test (&json_ctx, sizeof (CHAR) * i, i);
 133     do_test (&json_ctx, 0, i);
 134   }
 135
 136   for (i = 2; i <= 12; ++i)
 137     {
 138       do_test (&json_ctx, 0, 1 << i);
 139       do_test (&json_ctx, sizeof (CHAR) * 7, 1 << i);
 140       do_test (&json_ctx, sizeof (CHAR) * i, 1 << i);
 141       do_test (&json_ctx, sizeof (CHAR) * i, (size_t)((1 << i) / 1.5));
 142     }
 143
 144   json_array_end (&json_ctx);
 145   json_attr_object_end (&json_ctx);
 146   json_attr_object_end (&json_ctx);
 147   json_document_end (&json_ctx);
 148
 149   return ret;
 150 }
 151
 152 #include <support/test-driver.c>
 153
 154 #define libc_hidden_builtin_def(X)
 155 #ifndef WIDE
 156 # undef STRLEN
 157 # define STRLEN generic_strlen
 158 # include <string/strlen.c>
 159 #else
 160 # define WCSLEN generic_strlen
 161 # include <wcsmbs/wcslen.c>
 162 #endif