1  /* Measure bzero functions.
       2     Copyright (C) 2022-2023 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  #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