benchtests/bench-memset.c

   1 /* Measure memset functions.
   2    Copyright (C) 2013-2019 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 "memset"
  22 #else
  23 # define TEST_NAME "wmemset"
  24 #endif /* WIDE */
  25 #define MIN_PAGE_SIZE 131072
  26 #include "bench-string.h"
  27
  28 #include "json-lib.h"
  29
  30 CHAR *SIMPLE_MEMSET (CHAR *, int, size_t);
  31
  32 typedef CHAR *(*proto_t) (CHAR *, int, size_t);
  33
  34 IMPL (MEMSET, 1)
  35 IMPL (SIMPLE_MEMSET, 0)
  36
  37 CHAR *
  38 inhibit_loop_to_libcall
  39 SIMPLE_MEMSET (CHAR *s, int c, size_t n)
  40 {
  41   CHAR *r = s, *end = s + n;
  42   while (r < end)
  43     *r++ = c;
  44   return s;
  45 }
  46
  47 static void
  48 do_one_test (json_ctx_t *json_ctx, impl_t *impl, CHAR *s,
  49              int c __attribute ((unused)), size_t n)
  50 {
  51   size_t i, iters = INNER_LOOP_ITERS;
  52   timing_t start, stop, cur;
  53
  54   TIMING_NOW (start);
  55   for (i = 0; i < iters; ++i)
  56     {
  57       CALL (impl, s, c, n);
  58     }
  59   TIMING_NOW (stop);
  60
  61   TIMING_DIFF (cur, start, stop);
  62
  63   json_element_double (json_ctx, (double) cur / (double) iters);
  64 }
  65
  66 static void
  67 do_test (json_ctx_t *json_ctx, size_t align, int c, size_t len)
  68 {
  69   align &= 63;
  70   if ((align + len) * sizeof (CHAR) > page_size)
  71     return;
  72
  73   json_element_object_begin (json_ctx);
  74   json_attr_uint (json_ctx, "length", len);
  75   json_attr_uint (json_ctx, "alignment", align);
  76   json_attr_int (json_ctx, "char", c);
  77   json_array_begin (json_ctx, "timings");
  78
  79   FOR_EACH_IMPL (impl, 0)
  80     {
  81       do_one_test (json_ctx, impl, (CHAR *) (buf1) + align, c, len);
  82       alloc_bufs ();
  83     }
  84
  85   json_array_end (json_ctx);
  86   json_element_object_end (json_ctx);
  87 }
  88
  89 int
  90 test_main (void)
  91 {
  92   json_ctx_t json_ctx;
  93   size_t i;
  94   int c = 0;
  95
  96   test_init ();
  97
  98   json_init (&json_ctx, 0, stdout);
  99
 100   json_document_begin (&json_ctx);
 101   json_attr_string (&json_ctx, "timing_type", TIMING_TYPE);
 102
 103   json_attr_object_begin (&json_ctx, "functions");
 104   json_attr_object_begin (&json_ctx, TEST_NAME);
 105   json_attr_string (&json_ctx, "bench-variant", "");
 106
 107   json_array_begin (&json_ctx, "ifuncs");
 108   FOR_EACH_IMPL (impl, 0)
 109     json_element_string (&json_ctx, impl->name);
 110   json_array_end (&json_ctx);
 111
 112   json_array_begin (&json_ctx, "results");
 113
 114   for (c = -65; c <= 130; c += 65)
 115     {
 116       for (i = 0; i < 18; ++i)
 117         do_test (&json_ctx, 0, c, 1 << i);
 118       for (i = 1; i < 32; ++i)
 119         {
 120           do_test (&json_ctx, i, c, i);
 121           if (i & (i - 1))
 122             do_test (&json_ctx, 0, c, i);
 123         }
 124       for (i = 32; i < 512; i+=32)
 125         {
 126           do_test (&json_ctx, 0, c, i);
 127           do_test (&json_ctx, i, c, i);
 128         }
 129       do_test (&json_ctx, 1, c, 14);
 130       do_test (&json_ctx, 3, c, 1024);
 131       do_test (&json_ctx, 4, c, 64);
 132       do_test (&json_ctx, 2, c, 25);
 133     }
 134   for (i = 33; i <= 256; i += 4)
 135     {
 136       do_test (&json_ctx, 0, c, 32 * i);
 137       do_test (&json_ctx, i, c, 32 * i);
 138     }
 139
 140   json_array_end (&json_ctx);
 141   json_attr_object_end (&json_ctx);
 142   json_attr_object_end (&json_ctx);
 143   json_document_end (&json_ctx);
 144
 145   return ret;
 146 }
 147
 148 #include <support/test-driver.c>