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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Transforms/Vectorize/LoopVectorize.cpp: Assertion `NumIncoming > 1 && "Invalid PHI"' failed."
href="http://llvm.org/bugs/show_bug.cgi?id=15990">15990</a>
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<tr>
<th>Summary</th>
<td>Transforms/Vectorize/LoopVectorize.cpp: Assertion `NumIncoming > 1 && "Invalid PHI"' failed.
</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>kcc@google.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>test case by csmith/creduce
LLVM r181757, x86_64 linux.
int a;
int b;
unsigned c;
int d;
void fn1 () {
for (; b; ++b) {
c = 0;
for (; c <= 0; c += 1)
d = 0;
a &= !c;
}
}
% clang -cc1 -triple x86_64-unknown-linux-gnu -emit-obj -O3 -backend-option
-vectorize-loops -x c cc.c
clang: llvm/lib/Transforms/Vectorize/LoopVectorize.cpp:2031: void <anonymous
namespace>::InnerLoopVectorizer::vectorizeBlockInLoop(<anonymous>::LoopVectorizationLegality
*, llvm::BasicBlock *, PhiVector *): Assertion `NumIncoming > 1 && "Invalid
PHI"' failed.
Stack dump:
0. Program arguments: clang -cc1 -triple x86_64-unknown-linux-gnu -emit-obj
-O3 -backend-option -vectorize-loops -x c cc.c
1. <eof> parser at end of file
2. Per-module optimization passes
3. Running pass 'CallGraph Pass Manager' on module 'cc.c'.
4. Running pass 'Loop Pass Manager' on function '@fn1'
5. Running pass 'Loop Vectorization' on basic block '%for.cond1.preheader'</pre>
</div>
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