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<div style="font-family: Arial, sans-serif; font-size: 13px; ">Thanks, Bob!</div>
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<div style="font-family: Arial, sans-serif; font-size: 13px; ">I guess we should be expecting a 4.2.1 update after clang 3.0 has been released, shouldn't we?</div>
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<div style="font-family: Arial, sans-serif; font-size: 13px; ">Best,</div>
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<div style="font-family: Arial, sans-serif; font-size: 13px; ">Akos</div>
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<span style="font-weight:bold">From: </span>Bob Wilson <<a href="mailto:bob.wilson@apple.com">bob.wilson@apple.com</a>><br>
<span style="font-weight:bold">Date: </span>Thu, 20 Oct 2011 08:46:38 -0700<br>
<span style="font-weight:bold">To: </span>Ákos Somorjai <<a href="mailto:asomorjai@graphisoft.com">asomorjai@graphisoft.com</a>><br>
<span style="font-weight:bold">Cc: </span>"<a href="mailto:llvmdev@cs.uiuc.edu">llvmdev@cs.uiuc.edu</a>" <<a href="mailto:llvmdev@cs.uiuc.edu">llvmdev@cs.uiuc.edu</a>><br>
<span style="font-weight:bold">Subject: </span>Re: [LLVMdev] Crash with optimization for size<br>
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This is <a href="http://llvm.org/pr10514">http://llvm.org/pr10514</a>
<div>Unfortunately the fix did not make it into that version of clang.</div>
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<div>On Oct 20, 2011, at 7:47 AM, Somorjai, Akos wrote:</div>
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<div style="font-size: 13px; ">Here's a code generated with <b>-Os</b> on darwin/x86_64 with clang from the Xcode 4.2 GM toolset on Mac OSX 10.7.2 (Apple clang version 3.0 (tags/Apple/clang-211.10.1) (based on LLVM 3.0svn), Target: x86_64-apple-darwin11.2.0)</div>
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<div>0x000000010277d281 <+2102> lea 0x1d43bd0(%rip),%rax # 0x1044c0e58 <gFloorPlanCutData></div>
<div>0x000000010277d288 <+2109> movaps 0x80(%rax),%xmm0</div>
<div>0x000000010277d28f <+2116> movaps %xmm0,-0x40(%rbp)</div>
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<div style="font-size: 13px; ">The documentation for 'movaps' states: "<span class="Apple-style-span" style="font-size: medium; font-family: Arial; ">When the source or destination operand is a memory location, it must be aligned on a 16-byte boundary.</span>"
The problem is that the address of the global variable loaded into AX is not necessarily aligned; as it isn't in our case, which leads to the crash.</div>
<div style="font-size: 13px; "><br>
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<div style="font-size: 13px; ">Here's is the code; it is loading the address of a global variable into AX, and tries to copy the data member, coming from the following class:</div>
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MD5::FingerPrint<span class="Apple-tab-span" style="white-space:pre"></span>cutDataCheckSum = ::gFloorPlanCutData.GetCutDataCheckSum ();</div>
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memcpy (elemData->cutDataCheckSum, cutDataCheckSum.data, <span style="color: #bb2d9d">
sizeof</span> (elemData->cutDataCheckSum));</div>
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namespace<span style="color: #000000"> MD5 {</span></div>
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<span class="Apple-tab-span" style="white-space:pre"></span><span style="color: #bb2d9d">class</span> GSROOT_DLL_EXPORT FingerPrint {</div>
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<span style="color: #000000"><span class="Apple-tab-span" style="white-space:pre"></span></span>public<span style="color: #000000">:</span></div>
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<span class="Apple-tab-span" style="white-space:pre"></span>FingerPrint ();</div>
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<span class="Apple-tab-span" style="white-space:pre"></span><span style="color: #bb2d9d">virtual</span> ~FingerPrint () {};</div>
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<span class="Apple-tab-span" style="white-space:pre"></span>FingerPrint (<span style="color: #bb2d9d">unsigned</span><span style="color: #bb2d9d">char</span> fp[<span style="color: #2c2ecf">16</span>]);</div>
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<span class="Apple-tab-span" style="white-space:pre"></span><span style="color: #bb2d9d">void</span> Set (<span style="color: #bb2d9d">unsigned</span><span style="color: #bb2d9d">char</span> fp[<span style="color: #2c2ecf">16</span>]);</div>
<div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 11px/normal Menlo; ">
<span class="Apple-tab-span" style="white-space:pre"></span><span style="color: #bb2d9d">virtual</span><span class="Apple-tab-span" style="white-space:pre"></span>GSErrCode<span class="Apple-tab-span" style="white-space:pre">
</span>Write (GS::OChannel& oc) <span style="color: #bb2d9d">const</span>;</div>
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<span class="Apple-tab-span" style="white-space:pre"></span><span style="color: #bb2d9d">virtual</span><span class="Apple-tab-span" style="white-space:pre"></span>GSErrCode<span class="Apple-tab-span" style="white-space:pre">
</span>Read (GS::IChannel& ic);</div>
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<span class="Apple-tab-span" style="white-space:pre"></span><span style="color: #bb2d9d">virtual</span><span class="Apple-tab-span" style="white-space:pre"></span>GSErrCode<span class="Apple-tab-span" style="white-space:pre">
</span>GetAsString (<span style="color: #bb2d9d">char</span>* md5String) <span style="color: #bb2d9d">
const</span>;</div>
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<span class="Apple-tab-span" style="white-space:pre"></span><span style="color: #bb2d9d">bool</span><span class="Apple-tab-span" style="white-space:pre"></span>IsEmpty (<span style="color: #bb2d9d">void</span>)
<span style="color: #bb2d9d">const</span>;</div>
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<span class="Apple-tab-span" style="white-space:pre"></span><span style="color: #bb2d9d">void</span><span class="Apple-tab-span" style="white-space:pre"></span>Clear (<span style="color: #bb2d9d">void</span>);</div>
<div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 11px/normal Menlo; ">
<span class="Apple-tab-span" style="white-space:pre"></span><span style="color: #bb2d9d">bool</span>
<span style="color: #bb2d9d">operator</span> == (<span style="color: #bb2d9d">const</span> FingerPrint&<span class="Apple-tab-span" style="white-space:pre"></span>rhs)
<span style="color: #bb2d9d">const</span>;</div>
<div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 11px/normal Menlo; ">
<span class="Apple-tab-span" style="white-space:pre"></span><span style="color: #bb2d9d">bool</span>
<span style="color: #bb2d9d">operator</span> != (<span style="color: #bb2d9d">const</span> FingerPrint&<span class="Apple-tab-span" style="white-space:pre"></span>rhs)
<span style="color: #bb2d9d">const</span>;</div>
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<span class="Apple-tab-span" style="white-space:pre"></span>FingerPrint&<span class="Apple-tab-span" style="white-space:pre"></span><span style="color: #bb2d9d">operator</span>= (<span style="color: #bb2d9d">const</span> FingerPrint& source);</div>
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<span style="color: #000000"><span class="Apple-tab-span" style="white-space:pre"></span></span>public<span style="color: #000000">:</span></div>
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<span class="Apple-tab-span" style="white-space:pre"></span><span style="color: #bb2d9d">unsigned</span><span style="color: #bb2d9d">char</span> data[<span style="color: #2c2ecf">16</span>];</div>
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<span class="Apple-tab-span" style="white-space:pre"></span>};</div>
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}</div>
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<div>The type of <span class="Apple-style-span" style="font-family: Menlo; "><span class="Apple-style-span" style="font-size: 11px;">gFloorPlanCutData</span><span style="font-family: Arial; "> is</span></span></div>
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<span style="color: #bb2d9d">class</span> FloorPlanCutData: <span style="color: #bb2d9d">
public</span> GS::Object,</div>
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<span class="Apple-tab-span" style="white-space:pre"></span> <span style="color: #bb2d9d">
public</span> GS::StateEventSource {</div>
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<br>
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<span class="Apple-tab-span" style="white-space:pre"></span>DECLARE_CLASS_INFO</div>
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private<span style="color: #000000">:</span></div>
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<span class="Apple-tab-span" style="white-space:pre"></span><span style="color: #bb2d9d">double</span> currCutLevel;</div>
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<span class="Apple-tab-span" style="white-space:pre"></span><span style="color: #bb2d9d">double</span> topCutLevel;</div>
<div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 11px/normal Menlo; ">
<span class="Apple-tab-span" style="white-space:pre"></span><span style="color: #bb2d9d">double</span> bottomCutLevel;</div>
<div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 11px/normal Menlo; ">
<span class="Apple-tab-span" style="white-space:pre"></span><span style="color: #bb2d9d">short</span> topCutBaseStoryRelativeIndex;</div>
<div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 11px/normal Menlo; ">
<span class="Apple-tab-span" style="white-space:pre"></span><span style="color: #bb2d9d">short</span> bottomCutBaseStoryRelativeIndex;</div>
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<span class="Apple-tab-span" style="white-space:pre"></span><span style="color: #bb2d9d">double</span> fixLevel2Absolute0;</div>
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<span class="Apple-tab-span" style="white-space:pre"></span>Int32<span class="Apple-tab-span" style="white-space:pre"></span>lock;</div>
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<br>
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<span style="color: #000000"><span class="Apple-tab-span" style="white-space:pre"></span></span>// temporary data dependent from the current story</div>
<div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 11px/normal Menlo; ">
<span class="Apple-tab-span" style="white-space:pre"></span><span style="color: #bb2d9d">double</span><span class="Apple-tab-span" style="white-space:pre"></span>currCutLevelCalculated;</div>
<div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 11px/normal Menlo; ">
<span class="Apple-tab-span" style="white-space:pre"></span><span style="color: #bb2d9d">double</span><span class="Apple-tab-span" style="white-space:pre"></span>topCutLevelCalculated;</div>
<div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 11px/normal Menlo; ">
<span class="Apple-tab-span" style="white-space:pre"></span><span style="color: #bb2d9d">double</span> currentStoryLevel;</div>
<div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 11px/normal Menlo; ">
<span class="Apple-tab-span" style="white-space:pre"></span><span style="color: #bb2d9d">double</span> topBase2Current;</div>
<div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 11px/normal Menlo; ">
<span class="Apple-tab-span" style="white-space:pre"></span><span style="color: #bb2d9d">double</span> bottomBase2Current;</div>
<div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 11px/normal Menlo; ">
<span class="Apple-tab-span" style="white-space:pre"></span><span style="color: #bb2d9d">short</span> currentFloorIndex;</div>
<div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 11px/normal Menlo; ">
<span class="Apple-tab-span" style="white-space:pre"></span><span style="color: #bb2d9d">bool</span><span class="Apple-tab-span" style="white-space:pre"></span>relativeCalculated;</div>
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<span class="Apple-tab-span" style="white-space:pre"></span>MD5::FingerPrint<span class="Apple-tab-span" style="white-space:pre"></span>cutDataCheckSum;</div>
<div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 11px/normal Menlo; ">
<br>
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<span class="Apple-tab-span" style="white-space:pre"></span>...</div>
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}</div>
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<div style="font-size: 13px; "><br>
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<div style="font-size: 13px; ">The optimization kicks in because 'data' is 16-bytes; but there's no alignment check…</div>
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<div style="font-size: 13px; ">This seems to be a code generation error, but I couldn't reproduce it in a small application. Is this a known bug, or shall I adjust my build settings?</div>
<div style="font-size: 13px; "><br>
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<div style="font-size: 13px; ">Thanks,</div>
<div style="font-size: 13px; "><br>
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<div style="font-size: 13px; "><span class="Apple-style-span" style="font-family: Times; font-size: medium; "><strong style="font-family: Arial, sans-serif; font-size: 12pt; color: black; ">Ákos Somorjai</strong></span></div>
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<p style="font-family: Times; font-size: medium; "><font style="font-family: Arial, sans-serif; font-size: 9pt; color: black; ">Developer Support Manager</font><br>
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