https://svn.boost.org/trac10/ticket/9985 <p> Using Visual Studio 2012 to compile the following C++ code:- </p> <pre class="wiki">double desiredPresentationSpeed = 1.0f; boost::atomic&lt;double&gt; m_configuredPresentationRate; m_configuredPresentationRate = desiredPresentationSpeed; return S_OK; </pre><p> The compiler outputs the following warning for a Release build:- </p> <p> <strong> 76&gt;c:\sdks\boost_1_55_0\boost\atomic\detail\windows.hpp(1598): warning C4731: 'AVDecoders::CVideoDecoderHandler::<a class="missing wiki">ConfigurePresentationSpeed</a>' : frame pointer register 'ebx' modified by inline assembly code </strong> </p> <p> And the program subsequently crashes on the third line above. This is because the ebx register is modified by the boost::atomic code (in this case at 010DE08E in the asm code below) and the program then crashes further down when the 'pop ebx' is executed (at 010DE0AE), because the esp register has been set incorrectly (on the previous line) using the value now in ebx. </p> <pre class="wiki"> m_configuredPresentationRate = desiredPresentationSpeed; 010DE064 mov eax,dword ptr [desiredPresentationSpeed] 010DE067 mov dword ptr [ebp-10h],eax 010DE06A mov eax,dword ptr [ebp-4] 010DE06D mov dword ptr [ebp-0Ch],eax 010DE070 lea eax,[ecx+1B7Ch] 010DE076 mov dword ptr [ebp-4],eax 010DE079 test al,7 010DE07B jne AVDecoders::CVideoDecoderHandler::ConfigurePresentationSpeed+8Bh (010DE08Bh) 010DE07D mov edx,dword ptr [ebp-4] 010DE080 movq xmm4,mmword ptr [ebp-10h] 010DE085 movq mmword ptr [edx],xmm4 010DE089 jmp AVDecoders::CVideoDecoderHandler::ConfigurePresentationSpeed+0A6h (010DE0A6h) 010DE08B mov edi,dword ptr [ebp-4] 010DE08E mov ebx,dword ptr [ebp-10h] 010DE091 mov ecx,dword ptr [ebp-0Ch] 010DE094 mov eax,dword ptr [edi] 010DE096 mov edx,dword ptr [edi+4] 010DE099 lea esp,[esp] 010DE0A0 lock cmpxchg8b qword ptr [edi] 010DE0A4 jne AVDecoders::CVideoDecoderHandler::ConfigurePresentationSpeed+0A0h (010DE0A0h) return S_OK; 010DE0A6 xor eax,eax } 010DE0A8 pop edi 010DE0A9 mov esp,ebp 010DE0AB pop ebp 010DE0AC mov esp,ebx 010DE0AE pop ebx 010DE0AF ret 4 </pre><p> The boost code in question can be found here, under template "platform_store64" :- <a href="http://www.boost.org/doc/libs/1_55_0/boost/atomic/detail/windows.hpp">http://www.boost.org/doc/libs/1_55_0/boost/atomic/detail/windows.hpp</a> </p> <p> This Microsoft page <a class="ext-link" href="http://msdn.microsoft.com/en-us/library/k1a8ss06(v=vs.110).aspx"><span class="icon">​</span>http://msdn.microsoft.com/en-us/library/k1a8ss06(v=vs.110).aspx</a> states "To ensure code runs correctly, do not modify EBX in asm code if the function requires dynamic stack alignment as it could modify the frame pointer. Either move the eight-byte aligned types out of the function, or avoid using EBX." </p> <p> So it looks as though a simple fix would be to add a 'push ebx' and 'pop ebx' in the final _asm code block, to preserve the value of ebx. </p> en-us /htdocs/site/boost.png https://svn.boost.org/trac10/ticket/9985 Trac 1.4.3 Daniel Vernon <daniel.vernon@…> Fri, 02 May 2014 08:52:35 GMT https://svn.boost.org/trac10/ticket/9985#comment:2 https://svn.boost.org/trac10/ticket/9985#comment:2 <ul> <li><strong>cc</strong> <span class="trac-author">Andrey.Semashev@…</span> added </li> <li><strong>status</strong> <span class="trac-field-old">new</span> → <span class="trac-field-new">closed</span> </li> <li><strong>resolution</strong> → <span class="trac-field-new">fixed</span> </li> </ul> <p> Fixed in <a class="ext-link" href="https://github.com/boostorg/atomic/commit/76b78f24915461a23cc56b587d1b4231c19a71ba"><span class="icon">​</span>https://github.com/boostorg/atomic/commit/76b78f24915461a23cc56b587d1b4231c19a71ba</a>. Will be released in 1.56. </p> Ticket