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<base href="https://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW " title="NEW --- - Casting result of side-effecting unary operation to union removes side effecting expression" href="https://urldefense.proofpoint.com/v2/url?u=https-3A__llvm.org_bugs_show-5Fbug.cgi-3Fid-3D23597&d=AwMBaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=pF93YEPyB-J_PERP4DUZOJDzFVX5ZQ57vQk33wu0vio&m=jDY4yyUHkq7FN5eKk46NJdlhQgDXLcO4VTdI_O6IfxQ&s=nrwJTqOy7af-_BRYMXZa4F9YHZawmdxPWERnUdmaeAw&e=">23597</a>
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<th>Summary</th>
<td>Casting result of side-effecting unary operation to union removes side effecting expression
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>3.6
</td>
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<th>Hardware</th>
<td>Macintosh
</td>
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<th>OS</th>
<td>MacOS X
</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>-New Bugs
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>colin.gordon@samsung.com
</td>
</tr>
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
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<div>
<pre>Created <span class=""><a href="attachment.cgi?id=14350" name="attach_14350" title="Code to reproduce">attachment 14350</a> <a href="attachment.cgi?id=14350&action=edit" title="Code to reproduce">[details]</a></span>
Code to reproduce
Overview:
Casting the result of a side-effecting unary expression (e.g., ++) to a union
without using the cast's result removes the side effect.
Steps to reproduce:
1. Compile the attached file, with any optimization level.
2. Run resulting binary.
Actual results:
Prints 0.
Expected results:
Prints 10.
Build Date and Platform:
First observed on:
Apple LLVM version 6.0 (clang-600.0.57) (based on LLVM 3.5svn)
Target: x86_64-apple-darwin13.4.0
Thread model: posix
Additional Builds and Platforms:
Also observed on:
clang version 3.6.0 (tags/RELEASE_360/final)
Target: x86_64-apple-darwin13.4.0
Thread model: posix
and:
Ubuntu clang version 3.5.0-4ubuntu2~trusty2 (tags/RELEASE_350/final) (based on
LLVM 3.5.0)
Target: x86_64-pc-linux-gnu
Thread model: posix</pre>
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