sysdeps/x86/tst-string-rtm.h

   1 /* Test string function in a transactionally executing RTM region.
   2    Copyright (C) 2021-2024 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 #include <string.h>
  20 #include <x86intrin.h>
  21 #include <sys/platform/x86.h>
  22 #include <support/check.h>
  23 #include <support/test-driver.h>
  24
  25 static int
  26 do_test_1 (const char *name, unsigned int loop, int (*prepare) (void),
  27            int (*function) (void))
  28 {
  29   if (!CPU_FEATURE_ACTIVE (RTM))
  30     return EXIT_UNSUPPORTED;
  31
  32   int status = prepare ();
  33   if (status != EXIT_SUCCESS)
  34     return status;
  35
  36   unsigned int i;
  37   unsigned int naborts = 0;
  38   unsigned int failed = 0;
  39   for (i = 0; i < loop; i++)
  40     {
  41       failed |= function ();
  42       if (_xbegin() == _XBEGIN_STARTED)
  43         {
  44           failed |= function ();
  45           _xend();
  46         }
  47       else
  48         {
  49           failed |= function ();
  50           ++naborts;
  51         }
  52     }
  53
  54   if (failed)
  55     FAIL_EXIT1 ("%s() failed", name);
  56
  57   if (naborts)
  58     {
  59       /* NB: Low single digit (<= 5%) noise-level aborts are normal for
  60          TSX.  */
  61       double rate = 100 * ((double) naborts) / ((double) loop);
  62       if (rate > 5)
  63         FAIL_EXIT1 ("TSX abort rate: %.2f%% (%d out of %d)",
  64                     rate, naborts, loop);
  65     }
  66
  67   return EXIT_SUCCESS;
  68 }
  69
  70 static int do_test (void);
  71
  72 #include <support/test-driver.c>