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