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<base href="https://llvm.org/bugs/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Infinite recursion in loop vectorizer"
href="https://llvm.org/bugs/show_bug.cgi?id=28541">28541</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Infinite recursion in loop vectorizer
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</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>Loop Optimizer
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>benny.kra@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>$ cat t.c
a, b, c;
fn1() {
while (b--) {
c = a;
switch (a & 3)
case 0:
do
case 3:
case 2:
case 1:
;
while (--c)
;
}
}
$ clang -O2 t.c
...
#8 0x00000000019ffbaa (anonymous
namespace)::InnerLoopVectorizer::createBlockInMask(llvm::BasicBlock*)
(bin/clang)
#9 0x0000000001a000d4 (anonymous
namespace)::InnerLoopVectorizer::createEdgeMask(llvm::BasicBlock*,
llvm::BasicBlock*) (bin/clang)
... repeats 100+ times ...
1. <eof> parser at end of file
2. Per-module optimization passes
3. Running pass 'Function Pass Manager' on module 't.c'.
4. Running pass 'Loop Vectorization' on function '@fn1'
clang: error: unable to execute command: Segmentation fault (core dumped)
clang: error: clang frontend command failed due to signal (use -v to see
invocation)
clang version 3.9.0 (trunk 275303) (llvm/trunk 275304)
The crash only occurs at -O2, the bug comes from the interaction of multiple
passes.</pre>
</div>
</p>
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