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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Infinite loop in opt -instcombine"
href="http://llvm.org/bugs/show_bug.cgi?id=21576">21576</a>
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<th>Summary</th>
<td>Infinite loop in opt -instcombine
</td>
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<th>Product</th>
<td>tools
</td>
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<th>Version</th>
<td>trunk
</td>
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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>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>opt
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>russell_gallop@sn.scee.net
</td>
</tr>
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
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<p>
<div>
<pre>$ cat bugpoint-reduced-simplified.ll
define void @autogen_SD2047654124() {
BB:
%A = alloca <1 x double>
%L = load <1 x double>* %A
%B = frem <1 x double> %L, %L
br label %CF33
CF33: ; preds = %CF33, %BB
br i1 undef, label %CF33, label %CF34
CF34: ; preds = %CF34, %CF33
%Tr = fptrunc <1 x double> %B to <1 x float>
%E13 = extractelement <1 x float> %Tr, i32 0
br i1 undef, label %CF34, label %CF35
CF35: ; preds = %CF34
%B29 = fdiv float 0xC08DAF2180000000, %E13
ret void
}
$ opt -instcombine bugpoint-reduced-simplified.ll -o out.ll
Gets stuck in infinite loop using ever-increasing amounts of memory.
Reproduced with trunk 222002.</pre>
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