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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 --- - X86InstrInfo.cpp:3791: valgrind problems"
href="http://llvm.org/bugs/show_bug.cgi?id=19932">19932</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>X86InstrInfo.cpp:3791: valgrind problems
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>new bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>dcb314@hotmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=12597" name="attach_12597" title="C source code">attachment 12597</a> <a href="attachment.cgi?id=12597&action=edit" title="C source code">[details]</a></span>
C source code
Attached source code, when compiled with flag -O2 by trunk dated 20140602,
running under valgrind, says
==20797== Conditional jump or move depends on uninitialised value(s)
==20797== at 0x1CC7A9A:
llvm::X86InstrInfo::optimizeCompareInstr(llvm::Machin
eInstr*, unsigned int, unsigned int, int, int, llvm::MachineRegisterInfo
const*)
const (X86InstrInfo.cpp:3791)
==20797== by 0x1FBDD31: (anonymous
namespace)::PeepholeOptimizer::runOnMachin
eFunction(llvm::MachineFunction&) (PeepholeOptimizer.cpp:322)
==20797== by 0x2562BA8: llvm::FPPassManager::runOnFunction(llvm::Function&)
(
LegacyPassManager.cpp:1545)
==20797== by 0x256334A: llvm::legacy::PassManagerImpl::run(llvm::Module&)
(Le
gacyPassManager.cpp:1565)
X86InstrInfo.cpp:3791 is
if ((ShouldUpdateCC || IsSwapped) && NewCC != OldCC) {
I checked all of these local variables and OldCC was the only
one that wasn't initialised at its declaration.
That might be the smoking gun.</pre>
</div>
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