ceph/src/boost/libs/uuid/test/test_msvc_simd_bug981648_main.cpp

   1 /*
   2 * Copyright 2014 Andrey Semashev
   3 *
   4 * Distributed under the Boost Software License, Version 1.0.
   5 * See accompanying file LICENSE_1_0.txt or copy at
   6 * http://www.boost.org/LICENSE_1_0.txt
   7 */
   8 /*
   9 * This is a part of the test for a workaround for MSVC 12 (VS2013) optimizer bug
  10 * which causes incorrect SIMD code generation for operator==. See:
  11 *
  12 * https://svn.boost.org/trac/boost/ticket/8509#comment:3
  13 * https://connect.microsoft.com/VisualStudio/feedbackdetail/view/981648#tabs
  14 *
  15 * This file contains the main entry point.
  16 */
  17 #include <cstdio>
  18 #include "test_msvc_simd_bug981648.hpp"
  19 extern void mp_grid_update_marker_parameters(headerProperty* header_prop, my_obj &current_marker);
  20 static my_obj g_my_obj;
  21 int main(void)
  22 {
  23 my_obj *p = &g_my_obj;
  24 p->m_uuid = uuid();
  25 uuid one, two;
  26 one.data[0] = 0; two.data[0] = 1;
  27 //*****************************************
  28 // This != statement generates two movdqu statements or pcmpeqd with a memory operand which crashes
  29 if (one != two) {
  30 std::printf("The first != operator works okay if it reaches this printf.\n");
  31 }
  32 my_obj a;
  33 a.m_uuid.data[0] = 1;
  34 std::printf("There should be a another printf coming next.\n");
  35 //*****************************************
  36 // The != statement in this function generates a movups and a movdqu statement.
  37 // It also crashes because the optimizer also creates a pcmpeqd for a non-aligned memory location.
  38 mp_grid_update_marker_parameters(p, a);
  39 return 0;
  40 }