benchtests/bench-memset.c

   1 /* Measure memset 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 #define TEST_MAIN
  20 #ifndef WIDE
  21 # define TEST_NAME "memset"
  22 #else
  23 # define TEST_NAME "wmemset"
  24 # define generic_memset generic_wmemset
  25 #endif /* WIDE */
  26 #define MIN_PAGE_SIZE 131072
  27 #include "bench-string.h"
  28
  29 #include "json-lib.h"
  30
  31 #ifdef WIDE
  32 CHAR *generic_wmemset (CHAR *, CHAR, size_t);
  33 #else
  34 void *generic_memset (void *, int, size_t);
  35 #endif
  36
  37 typedef void *(*proto_t) (void *, int, size_t);
  38
  39 IMPL (MEMSET, 1)
  40 IMPL (generic_memset, 0)
  41
  42 static void
  43 do_one_test (json_ctx_t *json_ctx, impl_t *impl, CHAR *s,
  44              int c __attribute ((unused)), size_t n)
  45 {
  46   size_t i, iters = INNER_LOOP_ITERS;
  47   timing_t start, stop, cur;
  48
  49   TIMING_NOW (start);
  50   for (i = 0; i < iters; ++i)
  51     {
  52       CALL (impl, s, c, n);
  53     }
  54   TIMING_NOW (stop);
  55
  56   TIMING_DIFF (cur, start, stop);
  57
  58   json_element_double (json_ctx, (double) cur / (double) iters);
  59 }
  60
  61 static void
  62 do_test (json_ctx_t *json_ctx, size_t align, int c, size_t len)
  63 {
  64   align &= 4095;
  65   if ((align + len) * sizeof (CHAR) > page_size)
  66     return;
  67
  68   json_element_object_begin (json_ctx);
  69   json_attr_uint (json_ctx, "length", len);
  70   json_attr_uint (json_ctx, "alignment", align);
  71   json_attr_int (json_ctx, "char", c);
  72   json_array_begin (json_ctx, "timings");
  73
  74   FOR_EACH_IMPL (impl, 0)
  75     {
  76       do_one_test (json_ctx, impl, (CHAR *) (buf1) + align, c, len);
  77     }
  78
  79   json_array_end (json_ctx);
  80   json_element_object_end (json_ctx);
  81 }
  82
  83 int
  84 test_main (void)
  85 {
  86   json_ctx_t json_ctx;
  87   size_t i;
  88   int c = 0;
  89
  90
  91   test_init ();
  92   alloc_bufs ();
  93   json_init (&json_ctx, 0, stdout);
  94
  95   json_document_begin (&json_ctx);
  96   json_attr_string (&json_ctx, "timing_type", TIMING_TYPE);
  97
  98   json_attr_object_begin (&json_ctx, "functions");
  99   json_attr_object_begin (&json_ctx, TEST_NAME);
 100   json_attr_string (&json_ctx, "bench-variant", "default");
 101
 102   json_array_begin (&json_ctx, "ifuncs");
 103   FOR_EACH_IMPL (impl, 0)
 104     json_element_string (&json_ctx, impl->name);
 105   json_array_end (&json_ctx);
 106
 107   json_array_begin (&json_ctx, "results");
 108
 109   for (c = -65; c <= 130; c += 65)
 110     {
 111       for (i = 0; i < 18; ++i)
 112         do_test (&json_ctx, 0, c, 1 << i);
 113       for (i = 0; i < 64; ++i)
 114         {
 115           do_test (&json_ctx, i, c, i);
 116           do_test (&json_ctx, 4096 - i, c, i);
 117           do_test (&json_ctx, 4095, c, i);
 118           if (i & (i - 1))
 119             do_test (&json_ctx, 0, c, i);
 120         }
 121       for (i = 32; i < 1024; i+=32)
 122         {
 123           do_test (&json_ctx, 0, c, i);
 124           do_test (&json_ctx, i, c, i);
 125         }
 126       do_test (&json_ctx, 1, c, 14);
 127       do_test (&json_ctx, 3, c, 1024);
 128       do_test (&json_ctx, 4, c, 64);
 129       do_test (&json_ctx, 2, c, 25);
 130     }
 131   for (i = 33; i <= 256; i += 4)
 132     {
 133       do_test (&json_ctx, 0, c, 32 * i);
 134       do_test (&json_ctx, i, c, 32 * i);
 135     }
 136
 137   json_array_end (&json_ctx);
 138   json_attr_object_end (&json_ctx);
 139   json_attr_object_end (&json_ctx);
 140   json_document_end (&json_ctx);
 141
 142   return ret;
 143 }
 144
 145 #include <support/test-driver.c>
 146
 147 #define libc_hidden_builtin_def(X)
 148 #define libc_hidden_def(X)
 149 #define libc_hidden_weak(X)
 150 #define weak_alias(X,Y)
 151 #ifndef WIDE
 152 # undef MEMSET
 153 # define MEMSET generic_memset
 154 # include <string/memset.c>
 155 #else
 156 # define WMEMSET generic_wmemset
 157 # include <wcsmbs/wmemset.c>
 158 #endif