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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Invalid IR generated at -O1 and above (instruction does not dominate uses)"
href="http://llvm.org/bugs/show_bug.cgi?id=22856">22856</a>
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<th>Summary</th>
<td>Invalid IR generated at -O1 and above (instruction does not dominate uses)
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<th>Product</th>
<td>libraries
</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>Linux
</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
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<th>Component</th>
<td>Loop Optimizer
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>andrew.b.adams@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=14012" name="attach_14012" title="failing test case">attachment 14012</a> <a href="attachment.cgi?id=14012&action=edit" title="failing test case">[details]</a></span>
failing test case
Some pass appears to be making invalid IR for the attached reduced test case.
Compiles fine with -O0. -print-after-all reveals the following invalid basic
block appearing after codegen prepare:
block_C: ; preds = %block_E, %block_A
%iv3 = phi i64 [ %2, %block_E ], [ %0, %block_A ]
%lsr = trunc i64 %2 to i32
%1 = add nsw i64 %iv3, 2
%2 = add nsw i64 %iv3, 1
br i1 undef, label %block_D, label %block_E
%2 is used before it is defined
I made a guess that something goes awry in the loop optimizer.</pre>
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