benchtests/bench-rawmemchr.c

   1 /* Measure memchr 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 #include <assert.h>
  20 #include <stdint.h>
  21
  22 #define TEST_MAIN
  23 #define TEST_NAME "rawmemchr"
  24 #include "bench-string.h"
  25
  26 #include "json-lib.h"
  27
  28 typedef char *(*proto_t) (const char *, int);
  29
  30 char *
  31 generic_rawmemchr (const char *s, int c)
  32 {
  33   if ((unsigned char) c != 0)
  34     return memchr (s, c, PTRDIFF_MAX);
  35   return (char *)s + strlen (s);
  36 }
  37
  38 IMPL (rawmemchr, 1)
  39 IMPL (generic_rawmemchr, 0)
  40
  41 static void
  42 do_one_test (json_ctx_t *json_ctx, impl_t *impl, const char *s, int c, char *exp_res)
  43 {
  44   size_t i, iters = INNER_LOOP_ITERS_LARGE * 4;
  45   timing_t start, stop, cur;
  46   char *res = CALL (impl, s, c);
  47   if (res != exp_res)
  48     {
  49       error (0, 0, "Wrong result in function %s %p %p", impl->name,
  50              res, exp_res);
  51       ret = 1;
  52       return;
  53     }
  54
  55   TIMING_NOW (start);
  56   for (i = 0; i < iters; ++i)
  57     {
  58       CALL (impl, s, c);
  59     }
  60   TIMING_NOW (stop);
  61
  62   TIMING_DIFF (cur, start, stop);
  63
  64   json_element_double (json_ctx, (double) cur / (double) iters);
  65 }
  66
  67 static void
  68 do_test (json_ctx_t *json_ctx, size_t align, size_t pos, size_t len, int seek_char)
  69 {
  70   size_t i;
  71   char *result;
  72
  73   align &= getpagesize () - 1;
  74   if (align + len >= page_size)
  75     return;
  76
  77   for (i = 0; i < len; ++i)
  78     {
  79       buf1[align + i] = 1 + 23 * i % 127;
  80       if (buf1[align + i] == seek_char)
  81         buf1[align + i] = seek_char + 1;
  82     }
  83   buf1[align + len] = 0;
  84
  85   assert (pos < len);
  86
  87   buf1[align + pos] = seek_char;
  88   buf1[align + len] = -seek_char;
  89   result = (char *) (buf1 + align + pos);
  90
  91   json_element_object_begin (json_ctx);
  92   json_attr_uint (json_ctx, "length", pos);
  93   json_attr_uint (json_ctx, "alignment", align);
  94   json_attr_uint (json_ctx, "char", seek_char);
  95   json_array_begin (json_ctx, "timings");
  96
  97   FOR_EACH_IMPL (impl, 0)
  98     do_one_test (json_ctx, impl, (char *) (buf1 + align), seek_char, result);
  99
 100   json_array_end (json_ctx);
 101   json_element_object_end (json_ctx);
 102 }
 103
 104 int
 105 test_main (void)
 106 {
 107   json_ctx_t json_ctx;
 108   size_t i;
 109   test_init ();
 110
 111   json_init (&json_ctx, 0, stdout);
 112
 113   json_document_begin (&json_ctx);
 114   json_attr_string (&json_ctx, "timing_type", TIMING_TYPE);
 115
 116   json_attr_object_begin (&json_ctx, "functions");
 117   json_attr_object_begin (&json_ctx, TEST_NAME);
 118   json_attr_string (&json_ctx, "bench-variant", "");
 119
 120   json_array_begin (&json_ctx, "ifuncs");
 121   FOR_EACH_IMPL (impl, 0)
 122     json_element_string (&json_ctx, impl->name);
 123   json_array_end (&json_ctx);
 124
 125   json_array_begin (&json_ctx, "results");
 126
 127   for (i = 1; i < 7; ++i)
 128     {
 129       do_test (&json_ctx, 0, 16 << i, 2048, 23);
 130       do_test (&json_ctx, i, 64, 256, 23);
 131       do_test (&json_ctx, 0, 16 << i, 2048, 0);
 132       do_test (&json_ctx, i, 64, 256, 0);
 133     }
 134   for (i = 1; i < 32; ++i)
 135     {
 136       do_test (&json_ctx, 0, i, i + 1, 23);
 137       do_test (&json_ctx, 0, i, i + 1, 0);
 138     }
 139   for (; i < 256; i += 32)
 140     {
 141       do_test (&json_ctx, 0, i, i + 1, 23);
 142       do_test (&json_ctx, 0, i - 1, i, 23);
 143     }
 144   for (; i < 512; i += 64)
 145     {
 146       do_test (&json_ctx, 0, i, i + 1, 23);
 147       do_test (&json_ctx, 0, i - 1, i, 23);
 148     }
 149   for (; i < 1024; i += 128)
 150     {
 151       do_test (&json_ctx, 0, i, i + 1, 23);
 152       do_test (&json_ctx, 0, i - 1, i, 23);
 153     }
 154   for (; i < 2048; i += 256)
 155     {
 156       do_test (&json_ctx, 0, i, i + 1, 23);
 157       do_test (&json_ctx, 0, i - 1, i, 23);
 158     }
 159   for (; i < 4096; i += 512)
 160     {
 161       do_test (&json_ctx, 0, i, i + 1, 23);
 162       do_test (&json_ctx, 0, i - 1, i, 23);
 163     }
 164
 165   json_array_end (&json_ctx);
 166   json_attr_object_end (&json_ctx);
 167   json_attr_object_end (&json_ctx);
 168   json_document_end (&json_ctx);
 169
 170   return ret;
 171 }
 172
 173 #include <support/test-driver.c>