<html>
<head>
<base href="https://llvm.org/bugs/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Instruction does not dominate all uses with -O3 on x86_64"
href="https://llvm.org/bugs/show_bug.cgi?id=26058">26058</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Instruction does not dominate all uses with -O3 on x86_64
</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>dcb314@hotmail.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>Created <span class=""><a href="attachment.cgi?id=15573" name="attach_15573" title="preprocessed C++ source code">attachment 15573</a> <a href="attachment.cgi?id=15573&action=edit" title="preprocessed C++ source code">[details]</a></span>
preprocessed C++ source code
The attached preprocessed C++ code compiles fine with -O2, but causes
a compiler crash with -O3.
Instruction does not dominate all uses!
%69 = extractelement <2 x float> %62, i32 1
%63 = insertelement <4 x float> undef, float %69, i32 0
Instruction does not dominate all uses!
%69 = extractelement <2 x float> %62, i32 1
%64 = insertelement <4 x float> %63, float %69, i32 1
fatal error: error in backend: Broken function found, compilation aborted!
clang: error: clang frontend command failed with exit code 70 (use -v to see
invocation)
clang version 3.8.0 (trunk 256708)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/dcb/llvm/results/bin
clang: note: diagnostic msg: PLEASE submit a bug report to
<a href="http://llvm.org/bugs/">http://llvm.org/bugs/</a> and include the crash backtrace, preprocessed source, and
associated run script.
clang: note: diagnostic msg: Error generating preprocessed source(s) - no
preprocessable inputs.</pre>
</div>
</p>
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