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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - SubRange join failure"
href="https://bugs.llvm.org/show_bug.cgi?id=35373">35373</a>
</td>
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<tr>
<th>Summary</th>
<td>SubRange join failure
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>All
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Register Allocator
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>david.stuttard@amd.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=19452" name="attach_19452" title="Reproducer for subrange join failure">attachment 19452</a> <a href="attachment.cgi?id=19452&action=edit" title="Reproducer for subrange join failure">[details]</a></span>
Reproducer for subrange join failure
There are some other SubRange join failures reported, but since the ones I've
investigated have resulted in different fixes I'm filing a fresh one for this
reproducer.
See <a class="bz_bug_link
bz_status_NEW "
title="NEW - UNREACHABLE "Couldn't join subrange" in RegisterCoalescer (out-of-tree backend)"
href="show_bug.cgi?id=32773">bug 32773</a>, <a class="bz_bug_link
bz_status_NEW "
title="NEW - Couldn't join subrange unreachable hit"
href="show_bug.cgi?id=33152">bug 33152</a> and <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - Couldn't join subrange unreachable for RegisterCoalescer remat"
href="show_bug.cgi?id=33524">bug 33524</a> for details of the others
The attached reproducer will provoke the problem.
Easiest way to do this is:
llc -march=amdgcn -run-pass simple-register-coalescer -o -
regcoal-subrange-join-seg.mir</pre>
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