benchtests/bench-bzero.c

   1 /* Measure bzero functions.
   2    Copyright (C) 2022-2024 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 #ifdef DO_MEMSET
  21 # define TEST_NAME "memset"
  22 #else
  23 # define TEST_NAME "bzero"
  24 #endif
  25 #define MIN_PAGE_SIZE 131072
  26 #include "bench-string.h"
  27
  28 #include "json-lib.h"
  29
  30 #ifdef DO_MEMSET
  31 void *generic_memset (void *, int, size_t);
  32
  33 typedef void *(*proto_t) (void *, int, size_t);
  34
  35 IMPL (memset, 1)
  36 IMPL (generic_memset, 0)
  37
  38 #else
  39 static void
  40 memset_zero (void * s, size_t len)
  41 {
  42   memset (s, '\0', len);
  43 }
  44
  45 typedef void (*proto_t) (void *, size_t);
  46
  47 IMPL (bzero, 1)
  48 IMPL (memset_zero, 0)
  49 #endif
  50
  51 static void
  52 do_one_test (json_ctx_t *json_ctx, impl_t *impl, CHAR *s, size_t n)
  53 {
  54   size_t i, iters = INNER_LOOP_ITERS8;
  55   timing_t start, stop, cur;
  56
  57   TIMING_NOW (start);
  58   for (i = 0; i < iters; ++i)
  59     {
  60 #ifdef DO_MEMSET
  61       CALL (impl, s, 0, n);
  62 #else
  63       CALL (impl, s, n);
  64 #endif
  65     }
  66   TIMING_NOW (stop);
  67
  68   TIMING_DIFF (cur, start, stop);
  69
  70   json_element_double (json_ctx, (double) cur / (double) iters);
  71 }
  72
  73 static void
  74 do_test (json_ctx_t *json_ctx, size_t align, size_t len)
  75 {
  76   align &= 4095;
  77   if ((align + len) * sizeof (CHAR) > page_size)
  78     return;
  79
  80   json_element_object_begin (json_ctx);
  81   json_attr_uint (json_ctx, "length", len);
  82   json_attr_uint (json_ctx, "alignment", align);
  83   json_array_begin (json_ctx, "timings");
  84
  85   FOR_EACH_IMPL (impl, 0)
  86     {
  87       do_one_test (json_ctx, impl, (CHAR *) (buf1) + align, len);
  88     }
  89
  90   json_array_end (json_ctx);
  91   json_element_object_end (json_ctx);
  92 }
  93
  94 int
  95 test_main (void)
  96 {
  97   json_ctx_t json_ctx;
  98   size_t i;
  99
 100   test_init ();
 101   alloc_bufs ();
 102   json_init (&json_ctx, 0, stdout);
 103
 104   json_document_begin (&json_ctx);
 105   json_attr_string (&json_ctx, "timing_type", TIMING_TYPE);
 106
 107   json_attr_object_begin (&json_ctx, "functions");
 108   json_attr_object_begin (&json_ctx, TEST_NAME);
 109   json_attr_string (&json_ctx, "bench-variant", "default");
 110
 111   json_array_begin (&json_ctx, "ifuncs");
 112   FOR_EACH_IMPL (impl, 0)
 113     json_element_string (&json_ctx, impl->name);
 114   json_array_end (&json_ctx);
 115
 116   json_array_begin (&json_ctx, "results");
 117
 118   for (i = 0; i < 18; ++i)
 119     do_test (&json_ctx, 0, 1 << i);
 120   for (i = 0; i < 64; ++i)
 121     {
 122       do_test (&json_ctx, i, i);
 123       do_test (&json_ctx, 4096 - i, i);
 124       do_test (&json_ctx, 4095, i);
 125       if (i & (i - 1))
 126         do_test (&json_ctx, 0, i);
 127     }
 128   for (i = 32; i < 1024; i+=32)
 129     {
 130       do_test (&json_ctx, 0, i);
 131       do_test (&json_ctx, i, i);
 132     }
 133   do_test (&json_ctx, 1, 14);
 134   do_test (&json_ctx, 3, 1024);
 135   do_test (&json_ctx, 4, 64);
 136   do_test (&json_ctx, 2, 25);
 137
 138   for (i = 33; i <= 256; i += 4)
 139     {
 140       do_test (&json_ctx, 0, 32 * i);
 141       do_test (&json_ctx, i, 32 * i);
 142     }
 143
 144   json_array_end (&json_ctx);
 145   json_attr_object_end (&json_ctx);
 146   json_attr_object_end (&json_ctx);
 147   json_document_end (&json_ctx);
 148
 149   return ret;
 150 }
 151
 152 #include <support/test-driver.c>
 153
 154 #ifdef DO_MEMSET
 155 # define libc_hidden_builtin_def(X)
 156 # define libc_hidden_def(X)
 157 # define libc_hidden_weak(X)
 158 # define weak_alias(X,Y)
 159 # undef MEMSET
 160 # define MEMSET generic_memset
 161 # include <string/memset.c>
 162 #endif