benchtests/bench-memmove.c

   1 /* Measure memmove functions.
   2    Copyright (C) 2013-2018 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 #ifdef TEST_BCOPY
  21 # define TEST_NAME "bcopy"
  22 #else
  23 # define TEST_NAME "memmove"
  24 #endif
  25 #include "bench-string.h"
  26 #include "json-lib.h"
  27
  28 char *simple_memmove (char *, const char *, size_t);
  29
  30 #ifdef TEST_BCOPY
  31 typedef void (*proto_t) (const char *, char *, size_t);
  32 void simple_bcopy (const char *, char *, size_t);
  33
  34 IMPL (simple_bcopy, 0)
  35 IMPL (bcopy, 1)
  36
  37 void
  38 simple_bcopy (const char *src, char *dst, size_t n)
  39 {
  40   simple_memmove (dst, src, n);
  41 }
  42 #else
  43 typedef char *(*proto_t) (char *, const char *, size_t);
  44
  45 IMPL (simple_memmove, 0)
  46 IMPL (memmove, 1)
  47 #endif
  48
  49 char *
  50 inhibit_loop_to_libcall
  51 simple_memmove (char *dst, const char *src, size_t n)
  52 {
  53   char *ret = dst;
  54   if (src < dst)
  55     {
  56       dst += n;
  57       src += n;
  58       while (n--)
  59         *--dst = *--src;
  60     }
  61   else
  62     while (n--)
  63       *dst++ = *src++;
  64   return ret;
  65 }
  66
  67 static void
  68 do_one_test (json_ctx_t *json_ctx, impl_t *impl, char *dst, char *src, const
  69              char *orig_src, size_t len)
  70 {
  71   size_t i, iters = INNER_LOOP_ITERS;
  72   timing_t start, stop, cur;
  73
  74   TIMING_NOW (start);
  75   for (i = 0; i < iters; ++i)
  76     {
  77 #ifdef TEST_BCOPY
  78       CALL (impl, src, dst, len);
  79 #else
  80       CALL (impl, dst, src, len);
  81 #endif
  82     }
  83   TIMING_NOW (stop);
  84
  85   TIMING_DIFF (cur, start, stop);
  86
  87   json_element_double (json_ctx, (double) cur / (double) iters);
  88 }
  89
  90 static void
  91 do_test (json_ctx_t *json_ctx, size_t align1, size_t align2, size_t len)
  92 {
  93   size_t i, j;
  94   char *s1, *s2;
  95
  96   align1 &= 63;
  97   if (align1 + len >= page_size)
  98     return;
  99
 100   align2 &= 63;
 101   if (align2 + len >= page_size)
 102     return;
 103
 104   s1 = (char *) (buf1 + align1);
 105   s2 = (char *) (buf2 + align2);
 106
 107   for (i = 0, j = 1; i < len; i++, j += 23)
 108     s1[i] = j;
 109
 110   json_element_object_begin (json_ctx);
 111   json_attr_uint (json_ctx, "length", (double) len);
 112   json_attr_uint (json_ctx, "align1", (double) align1);
 113   json_attr_uint (json_ctx, "align2", (double) align2);
 114   json_array_begin (json_ctx, "timings");
 115
 116   FOR_EACH_IMPL (impl, 0)
 117     do_one_test (json_ctx, impl, s2, (char *) (buf2 + align1), s1, len);
 118
 119   json_array_end (json_ctx);
 120   json_element_object_end (json_ctx);
 121 }
 122
 123 static int
 124 test_main (void)
 125 {
 126   json_ctx_t json_ctx;
 127   size_t i;
 128
 129   test_init ();
 130
 131   json_init (&json_ctx, 0, stdout);
 132
 133   json_document_begin (&json_ctx);
 134   json_attr_string (&json_ctx, "timing_type", TIMING_TYPE);
 135
 136   json_attr_object_begin (&json_ctx, "functions");
 137   json_attr_object_begin (&json_ctx, "memmove");
 138   json_attr_string (&json_ctx, "bench-variant", "default");
 139
 140   json_array_begin (&json_ctx, "ifuncs");
 141
 142   FOR_EACH_IMPL (impl, 0)
 143     json_element_string (&json_ctx, impl->name);
 144   json_array_end (&json_ctx);
 145
 146   json_array_begin (&json_ctx, "results");
 147   for (i = 0; i < 14; ++i)
 148     {
 149       do_test (&json_ctx, 0, 32, 1 << i);
 150       do_test (&json_ctx, 32, 0, 1 << i);
 151       do_test (&json_ctx, 0, i, 1 << i);
 152       do_test (&json_ctx, i, 0, 1 << i);
 153     }
 154
 155   for (i = 0; i < 32; ++i)
 156     {
 157       do_test (&json_ctx, 0, 32, i);
 158       do_test (&json_ctx, 32, 0, i);
 159       do_test (&json_ctx, 0, i, i);
 160       do_test (&json_ctx, i, 0, i);
 161     }
 162
 163   for (i = 3; i < 32; ++i)
 164     {
 165       if ((i & (i - 1)) == 0)
 166         continue;
 167       do_test (&json_ctx, 0, 32, 16 * i);
 168       do_test (&json_ctx, 32, 0, 16 * i);
 169       do_test (&json_ctx, 0, i, 16 * i);
 170       do_test (&json_ctx, i, 0, 16 * i);
 171     }
 172
 173   for (i = 32; i < 64; ++i)
 174     {
 175       do_test (&json_ctx, 0, 0, 32 * i);
 176       do_test (&json_ctx, i, 0, 32 * i);
 177       do_test (&json_ctx, 0, i, 32 * i);
 178       do_test (&json_ctx, i, i, 32 * i);
 179     }
 180
 181   json_array_end (&json_ctx);
 182   json_attr_object_end (&json_ctx);
 183   json_attr_object_end (&json_ctx);
 184   json_document_end (&json_ctx);
 185
 186   return ret;
 187 }
 188
 189 #include <support/test-driver.c>