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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - csmith fuzz testcase incorrectness on -O1+ without LLVM optimizations"
href="https://llvm.org/bugs/show_bug.cgi?id=25276">25276</a>
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<th>Summary</th>
<td>csmith fuzz testcase incorrectness on -O1+ without LLVM optimizations
</td>
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<th>Product</th>
<td>clang
</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>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>-New Bugs
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>alonzakai@gmail.com
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
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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=15134" name="attach_15134" title="testcase">attachment 15134</a> <a href="attachment.cgi?id=15134&action=edit" title="testcase">[details]</a></span>
testcase
Attached is a csmith fuzz testcase that fails when clang is given -O1, *even
without LLVM optimizations*, so it seems like the issue is in clang and not the
LLVM optimizer?
clang newfail_27643_1.cpp -O0 -emit-llvm -o a.bc -c -w -disable-llvm-optzns ;
clang a.bc ; ./a.out
gives the same result as gcc, while replacing -O0 with -O1 in that command
yields a different and incorrect output.
tested on latest trunk as of right now,
=====
commit 333aedbc24d97c7927193a261a71491d69b77225
Author: Yaron Keren <<a href="mailto:yaron.keren@gmail.com">yaron.keren@gmail.com</a>>
Date: Wed Oct 21 18:16:01 2015 +0000
Rename clang config.h include guard from CONFIG_H to CLANG_CONFIG_H
to make it different from LLVM config.h include guard.
git-svn-id: <a href="https://llvm.org/svn/llvm-project/cfe/trunk@250921">https://llvm.org/svn/llvm-project/cfe/trunk@250921</a>
91177308-0d34-0410-b5e6-96231b3b80d8
=====
commit ba3f35ef578512993618c7e961bdd9132a8863f2
Author: Yaron Keren <<a href="mailto:yaron.keren@gmail.com">yaron.keren@gmail.com</a>>
Date: Wed Oct 21 18:36:52 2015 +0000
Revert r250923 as config.h is not an installed header.
git-svn-id: <a href="https://llvm.org/svn/llvm-project/llvm/trunk@250924">https://llvm.org/svn/llvm-project/llvm/trunk@250924</a>
91177308-0d34-0410-b5e6-96231b3b80d8
=====</pre>
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