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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - FixupSetCC miscompile"
href="https://llvm.org/bugs/show_bug.cgi?id=28557">28557</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>FixupSetCC miscompile
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</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>Backend: X86
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>jvanadrighem@gmail.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=16746" name="attach_16746" title="Minimal Repro">attachment 16746</a> <a href="attachment.cgi?id=16746&action=edit" title="Minimal Repro">[details]</a></span>
Minimal Repro
For the reproducer here it looks like the xorl is being placed above the place
we set register value:
xorl %edx, %edx
movq (%rax), %rax
movq %rdi, %rdx
orq 96(%rbp), %rdx
movq %rax, -48(%rbp)
setne %sil
xorl %ebx, %ebx
movslq (%r8), %rcx
movb %sil, -113(%rbp)
movb %sil, %dl
Built with O2, but seems to happen with O3 as well. I tried to reduce the case
as much as possible but this is as minimal as I could get with abtest.py +
creduce + manual edits.</pre>
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