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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - RegisterCoalescer should do more subregister remats"
href="http://llvm.org/bugs/show_bug.cgi?id=15264">15264</a>
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<th>Summary</th>
<td>RegisterCoalescer should do more subregister remats
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<th>Product</th>
<td>libraries
</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>All
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>Register Allocator
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>zwarich@apple.com
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
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<p>
<div>
<pre>It should be possible to remat this pair of instructions:
DefMI: %vreg11<def> = MOV16r0 %EFLAGS<imp-def,dead>; GR16:%vreg11
CopyMI: %vreg23:sub_16bit<def,read-undef> = COPY %vreg11; GR32:%vreg23
NewMI: %vreg23:sub_16bit<def,read-undef> = MOV16r0 %EFLAGS<imp-def,dead>;
GR32:%vreg23
However, reMaterializeTrivialDef() currently bails because GR32 != GR16.</pre>
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