benchtests/bench-strlen.c

   1 /* Measure STRLEN functions.
   2    Copyright (C) 2013-2018 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    <http://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 #endif
  25 #include "bench-string.h"
  26
  27 #ifndef WIDE
  28 # define STRLEN strlen
  29 # define CHAR char
  30 # define MAX_CHAR CHAR_MAX
  31 #else
  32 # include <wchar.h>
  33 # define STRLEN wcslen
  34 # define CHAR wchar_t
  35 # define MAX_CHAR WCHAR_MAX
  36 #endif
  37
  38 #include "json-lib.h"
  39
  40 typedef size_t (*proto_t) (const CHAR *);
  41
  42 size_t
  43 simple_STRLEN (const CHAR *s)
  44 {
  45   const CHAR *p;
  46
  47   for (p = s; *p; ++p);
  48   return p - s;
  49 }
  50
  51 #ifndef WIDE
  52 size_t
  53 builtin_strlen (const CHAR *p)
  54 {
  55   return __builtin_strlen (p);
  56 }
  57 IMPL (builtin_strlen, 0)
  58 #endif
  59
  60 IMPL (simple_STRLEN, 0)
  61 IMPL (STRLEN, 1)
  62
  63
  64 static void
  65 do_one_test (json_ctx_t *json_ctx, impl_t *impl, const CHAR *s, size_t exp_len)
  66 {
  67   size_t len = CALL (impl, s), i, iters = INNER_LOOP_ITERS;
  68   timing_t start, stop, cur;
  69
  70   if (len != exp_len)
  71     {
  72       error (0, 0, "Wrong result in function %s %zd %zd", impl->name,
  73              len, exp_len);
  74       ret = 1;
  75       return;
  76     }
  77
  78   TIMING_NOW (start);
  79   for (i = 0; i < iters; ++i)
  80     {
  81       CALL (impl, s);
  82     }
  83   TIMING_NOW (stop);
  84
  85   TIMING_DIFF (cur, start, stop);
  86
  87   json_element_double (json_ctx, (double) cur / (double) iters);
  88 }
  89
  90 static void
  91 do_test (json_ctx_t *json_ctx, size_t align, size_t len)
  92 {
  93   size_t i;
  94
  95   align &= 63;
  96   if (align + sizeof(CHAR) * len >= page_size)
  97     return;
  98
  99   json_element_object_begin (json_ctx);
 100   json_attr_uint (json_ctx, "length", len);
 101   json_attr_uint (json_ctx, "alignment", align);
 102   json_array_begin (json_ctx, "timings");
 103
 104
 105   FOR_EACH_IMPL (impl, 0)
 106     {
 107       CHAR *buf = (CHAR *) (buf1);
 108
 109       for (i = 0; i < len; ++i)
 110         buf[align + i] = 1 + 11111 * i % MAX_CHAR;
 111       buf[align + len] = 0;
 112
 113       do_one_test (json_ctx, impl, (CHAR *) (buf + align), len);
 114       alloc_bufs ();
 115     }
 116
 117   json_array_end (json_ctx);
 118   json_element_object_end (json_ctx);
 119 }
 120
 121 int
 122 test_main (void)
 123 {
 124   json_ctx_t json_ctx;
 125   size_t i;
 126
 127   test_init ();
 128
 129   json_init (&json_ctx, 0, stdout);
 130
 131   json_document_begin (&json_ctx);
 132   json_attr_string (&json_ctx, "timing_type", TIMING_TYPE);
 133
 134   json_attr_object_begin (&json_ctx, "functions");
 135   json_attr_object_begin (&json_ctx, TEST_NAME);
 136   json_attr_string (&json_ctx, "bench-variant", "");
 137
 138   json_array_begin (&json_ctx, "ifuncs");
 139   FOR_EACH_IMPL (impl, 0)
 140     json_element_string (&json_ctx, impl->name);
 141   json_array_end (&json_ctx);
 142
 143   json_array_begin (&json_ctx, "results");
 144   /* Checking with only 4 * N alignments for wcslen, other alignments are wrong for wchar_t type arrays*/
 145
 146   for (i = 1; i < 8; ++i)
 147   {
 148     do_test (&json_ctx, sizeof(CHAR) * i, i);
 149     do_test (&json_ctx, 0, i);
 150   }
 151
 152   for (i = 2; i <= 12; ++i)
 153     {
 154       do_test (&json_ctx, 0, 1 << i);
 155       do_test (&json_ctx, sizeof(CHAR) * 7, 1 << i);
 156       do_test (&json_ctx, sizeof(CHAR) * i, 1 << i);
 157       do_test (&json_ctx, sizeof(CHAR) * i, (size_t)((1 << i) / 1.5));
 158     }
 159
 160   json_array_end (&json_ctx);
 161   json_attr_object_end (&json_ctx);
 162   json_attr_object_end (&json_ctx);
 163   json_document_end (&json_ctx);
 164
 165   return ret;
 166 }
 167
 168 #include <support/test-driver.c>