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<base href="http://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - X86FrameLowering::getFrameIndexOffset generates wrong offsets"
href="http://llvm.org/bugs/show_bug.cgi?id=17545">17545</a>
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<th>Summary</th>
<td>X86FrameLowering::getFrameIndexOffset generates wrong offsets
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Backend: X86
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>manjian2006@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=11360" name="attach_11360" title="Source Of The Crash And Patch">attachment 11360</a> <a href="attachment.cgi?id=11360&action=edit" title="Source Of The Crash And Patch">[details]</a></span>
Source Of The Crash And Patch
int X86FrameLowering::getFrameIndexOffset(const MachineFunction &MF, int FI)
const {
const X86RegisterInfo *RegInfo =
static_cast<const X86RegisterInfo*>(MF.getTarget().getRegisterInfo());
const MachineFrameInfo *MFI = MF.getFrameInfo();
- int Offset = MFI->getObjectOffset(FI) - getOffsetOfLocalArea();
+ int Offset = MFI->getObjectOffset(FI);
The Offset have already been considered OffsetOfLocalArea once,in
PEI::calculateFrameObjectOffsets.So subtract it back here make the offset
smaller than expected.
The file uploaded is the ll source cause a crash and a patch fixing this bug.
Crash cause:
The SkMatrix object is in [SP-60],but [SP-64] is what we expecting.This stack
object is align to 16 bytes.
%mat = alloca %class.SkMatrix, align 16
So the vmovaps inst will cause a gp exception when accessing unaligned stack
address.
the compile command is
llc -O2 -o crashx86.s crashx86.ll</pre>
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