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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [InstCombiner] fatal error: error in backend: Instruction Combining seems stuck in an infinite loop"
href="https://bugs.llvm.org/show_bug.cgi?id=47788">47788</a>
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<th>Summary</th>
<td>[InstCombiner] fatal error: error in backend: Instruction Combining seems stuck in an infinite loop
</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>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Scalar Optimizations
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>paulsson@linux.vnet.ibm.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=24041" name="attach_24041" title="original preprocessed test case (csmith)">attachment 24041</a> <a href="attachment.cgi?id=24041&action=edit" title="original preprocessed test case (csmith)">[details]</a></span>
original preprocessed test case (csmith)
clang -O3 -march=arch13 crash2.i -o a.out -w -mllvm -unroll-count=10 -mllvm
-enable-tbaa=false -mllvm -instcombine-infinite-loop-threshold=200
crash2.i (reduced):
short a, b, d;
int c, e;
long f;
short(g)() { return a < 0 || c ? : 0; }
void h(int *i) {
long *j = &f;
d = 0;
for (; d != 34; d++) {
b = -7;
for (; b; b = b + 1) {
e &= g() | 5;
e |= 0 >= 0;
*i |= d;
*j = *i;
}
}
}
void main() {}</pre>
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