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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [X86] combineStore - unreachable code"
href="https://bugs.llvm.org/show_bug.cgi?id=43919">43919</a>
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<th>Summary</th>
<td>[X86] combineStore - unreachable code
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Windows NT
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Backend: X86
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>llvm-dev@redking.me.uk
</td>
</tr>
<tr>
<th>CC</th>
<td>craig.topper@gmail.com, llvm-bugs@lists.llvm.org, llvm-dev@redking.me.uk, spatel+llvm@rotateright.com
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<th>Blocks</th>
<td>30996
</td>
</tr></table>
<p>
<div>
<pre>This code block contains logic that results in unreachable code:
if ((VT == MVT::i64 && F64IsLegal && !Subtarget.is64Bit()) &&
isa<LoadSDNode>(St->getValue()) &&
cast<LoadSDNode>(St->getValue())->isSimple() &&
St->getChain().hasOneUse() && St->isSimple()) {
if (Subtarget.is64Bit() || F64IsLegal) {
// ALWAYS TAKEN
}
// UNREACHABLE CODE
}
F64IsLegal is always true and Subtarget.is64Bit() is always false.
@craog - this seems to be a legacy of
-x86-experimental-vector-widening-legalization
Found by PVS Studio</pre>
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</p>
<div id="referenced">
<hr style="border: 1px dashed #969696">
<b>Referenced Bugs:</b>
<ul>
<li>
[<a class="bz_bug_link
bz_status_NEW "
title="NEW - [META] PVS Studio Warnings"
href="https://bugs.llvm.org/show_bug.cgi?id=30996">Bug 30996</a>] [META] PVS Studio Warnings
</li>
</ul>
</div>
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