benchtests/bench-memcmp.c

   1 /* Measure memcmp 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 #ifdef TEST_MEMCMPEQ
  21 # define TEST_NAME "__memcmpeq"
  22 #elif defined WIDE
  23 # define TEST_NAME "wmemcmp"
  24 #else
  25 # define TEST_NAME "memcmp"
  26 #endif
  27 #include "bench-string.h"
  28 #include "json-lib.h"
  29
  30 typedef int (*proto_t) (const CHAR *, const CHAR *, size_t);
  31
  32 IMPL (MEMCMP, 1)
  33
  34 static void
  35 do_one_test (json_ctx_t *json_ctx, impl_t *impl, const CHAR *s1,
  36              const CHAR *s2, size_t len)
  37 {
  38   size_t i, iters = INNER_LOOP_ITERS_LARGE;
  39   timing_t start, stop, cur;
  40
  41   TIMING_NOW (start);
  42   for (i = 0; i < iters; ++i)
  43     {
  44       CALL (impl, s1, s2, len);
  45     }
  46   TIMING_NOW (stop);
  47
  48   TIMING_DIFF (cur, start, stop);
  49
  50   json_element_double (json_ctx, (double) cur / (double) iters);
  51 }
  52
  53 static void
  54 do_test (json_ctx_t *json_ctx, size_t align1, size_t align2, size_t len,
  55          int exp_result)
  56 {
  57   size_t i;
  58   CHAR *s1, *s2;
  59
  60   align1 &= (4096 - CHARBYTES);
  61   if (align1 + (len + 1) * CHARBYTES >= page_size)
  62     return;
  63
  64   align2 &= (4096 - CHARBYTES);
  65   if (align2 + (len + 1) * CHARBYTES >= page_size)
  66     return;
  67
  68   json_element_object_begin (json_ctx);
  69   json_attr_uint (json_ctx, "length", (double) len);
  70   json_attr_uint (json_ctx, "align1", (double) align1);
  71   json_attr_uint (json_ctx, "align2", (double) align2);
  72   json_attr_uint (json_ctx, "result", (double) exp_result);
  73   json_array_begin (json_ctx, "timings");
  74
  75   s1 = (CHAR *)(buf1 + align1);
  76   s2 = (CHAR *)(buf2 + align2);
  77
  78   for (i = 0; i < len; i++)
  79     s1[i] = s2[i] = 1 + (23 << ((CHARBYTES - 1) * 8)) * i % MAX_CHAR;
  80
  81   if (len)
  82     {
  83       s1[len] = align1;
  84       s2[len] = align2;
  85       s2[len - 1] -= exp_result;
  86     }
  87
  88   FOR_EACH_IMPL (impl, 0)
  89     {
  90       do_one_test (json_ctx, impl, s1, s2, len);
  91     }
  92
  93   json_array_end (json_ctx);
  94   json_element_object_end (json_ctx);
  95 }
  96
  97 int
  98 test_main (void)
  99 {
 100   json_ctx_t json_ctx;
 101   size_t i;
 102
 103   test_init ();
 104
 105   json_init (&json_ctx, 0, stdout);
 106
 107   json_document_begin (&json_ctx);
 108   json_attr_string (&json_ctx, "timing_type", TIMING_TYPE);
 109
 110   json_attr_object_begin (&json_ctx, "functions");
 111   json_attr_object_begin (&json_ctx, TEST_NAME);
 112   json_attr_string (&json_ctx, "bench-variant", "default");
 113
 114   json_array_begin (&json_ctx, "ifuncs");
 115   FOR_EACH_IMPL (impl, 0)
 116     json_element_string (&json_ctx, impl->name);
 117   json_array_end (&json_ctx);
 118
 119   json_array_begin (&json_ctx, "results");
 120   for (i = 0; i < 32; ++i)
 121     {
 122       do_test (&json_ctx, i * CHARBYTES, i * CHARBYTES, i, 0);
 123       do_test (&json_ctx, i * CHARBYTES, i * CHARBYTES, i, 1);
 124       do_test (&json_ctx, i * CHARBYTES, i * CHARBYTES, i, -1);
 125     }
 126
 127   for (i = 0; i < 32; ++i)
 128     {
 129       do_test (&json_ctx, 0, 0, i, 0);
 130       do_test (&json_ctx, 0, 0, i, 1);
 131       do_test (&json_ctx, 0, 0, i, -1);
 132       do_test (&json_ctx, 4096 - i, 0, i, 0);
 133       do_test (&json_ctx, 4096 - i, 0, i, 1);
 134       do_test (&json_ctx, 4096 - i, 0, i, -1);
 135     }
 136
 137   for (i = 33; i < 385; i += 32)
 138     {
 139       do_test (&json_ctx, 0, 0, i, 0);
 140       do_test (&json_ctx, 0, 0, i, 1);
 141       do_test (&json_ctx, 0, 0, i, -1);
 142       do_test (&json_ctx, i, 0, i, 0);
 143       do_test (&json_ctx, 0, i, i, 1);
 144       do_test (&json_ctx, i, i, i, -1);
 145     }
 146
 147   for (i = 1; i < 10; ++i)
 148     {
 149       do_test (&json_ctx, 0, 0, 2 << i, 0);
 150       do_test (&json_ctx, 0, 0, 2 << i, 1);
 151       do_test (&json_ctx, 0, 0, 2 << i, -1);
 152       do_test (&json_ctx, (8 - i) * CHARBYTES, (2 * i) * CHARBYTES, 16 << i, 0);
 153       do_test (&json_ctx, 0, 0, 16 << i, 0);
 154       do_test (&json_ctx, 0, 0, 16 << i, 1);
 155       do_test (&json_ctx, 0, 0, 16 << i, -1);
 156       do_test (&json_ctx, i, 0, 2 << i, 0);
 157       do_test (&json_ctx, 0, i, 2 << i, 1);
 158       do_test (&json_ctx, i, i, 2 << i, -1);
 159       do_test (&json_ctx, i, 0, 16 << i, 0);
 160       do_test (&json_ctx, 0, i, 16 << i, 1);
 161       do_test (&json_ctx, i, i, 16 << i, -1);
 162     }
 163
 164   for (i = 1; i < 10; ++i)
 165     {
 166       do_test (&json_ctx, i * CHARBYTES, 2 * (i * CHARBYTES), 8 << i, 0);
 167       do_test (&json_ctx, i * CHARBYTES, 2 * (i * CHARBYTES), 8 << i, 1);
 168       do_test (&json_ctx, i * CHARBYTES, 2 * (i * CHARBYTES), 8 << i, -1);
 169     }
 170
 171   json_array_end (&json_ctx);
 172   json_attr_object_end (&json_ctx);
 173   json_attr_object_end (&json_ctx);
 174   json_document_end (&json_ctx);
 175
 176   return ret;
 177 }
 178
 179 #include <support/test-driver.c>