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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Couldn't join subrange unreachable for RegisterCoalescer remat"
href="https://bugs.llvm.org/show_bug.cgi?id=33524">33524</a>
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<th>Summary</th>
<td>Couldn't join subrange unreachable for RegisterCoalescer remat
</td>
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<th>Product</th>
<td>libraries
</td>
</tr>
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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>All
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Register Allocator
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>david.stuttard@amd.com
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=18668" name="attach_18668" title="Test case">attachment 18668</a> <a href="attachment.cgi?id=18668&action=edit" title="Test case">[details]</a></span>
Test case
I'm seeing an issue for the AMDGCN backend (llc -march=amdgcn <testcase>.ll)
where the RegisterCoalescer hits unreachable for a SubRange join
I think I've narrowed this down to an issue in a remat (hence the name)
I've got a potential fix for this that I'll post to reviews.llvm.org (and link
from here)
I've already verified that the fix doesn't make any difference to <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>
which superficially seems similar.
<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> may also be related</pre>
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