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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - compiler infinite loop aliasing bcmp to memcmp"
href="https://bugs.llvm.org/show_bug.cgi?id=42728">42728</a>
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<th>Summary</th>
<td>compiler infinite loop aliasing bcmp to memcmp
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<th>Product</th>
<td>libraries
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
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<th>OS</th>
<td>Linux
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>enhancement
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>Core LLVM classes
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>ndesaulniers@google.com
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<th>CC</th>
<td>clement.courbet@gmail.com, jyknight@google.com, llvm-bugs@lists.llvm.org, srhines@google.com
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<div>
<pre>Created <span class=""><a href="attachment.cgi?id=22276" name="attach_22276" title="string.i">attachment 22276</a> <a href="attachment.cgi?id=22276&action=edit" title="string.i">[details]</a></span>
string.i
Possibly related to <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - Linux kernel build: Regression due memcmp to bcmp optimization"
href="show_bug.cgi?id=41035">https://bugs.llvm.org/show_bug.cgi?id=41035</a>.
declaring bcmp as an alias to memcmp, then using memcmp in a way that it would
be lowered to a bcmp is resulting in the compiler not exiting.
Attached is a test case. Observable at -O1 and above, but not -O0.
Instead, I can work around this with an explicit tail call, but it's curious as
to why the addition of the alias causing the compiler to hang.</pre>
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