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<base href="https://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Exploit LCDFR/LPDFR/LNDFR instructions"
href="https://llvm.org/bugs/show_bug.cgi?id=23419">23419</a>
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<th>Summary</th>
<td>Exploit LCDFR/LPDFR/LNDFR instructions
</td>
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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>Other
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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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>Backend: SystemZ
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>uweigand@de.ibm.com
</td>
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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>System z currently uses the IEEE-specific forms of LOAD COMPLEMENT,
LOAD NEGATIVE and LOAD POSITIVE. However, in cases where we don't
need the resulting condition codes, we can instead use the generic
forms of those instructions (e.g. LCDFR instead of LCDBR).
To do so, we should always start by emitting the generic form, and
if it turns out we can actually use the condition code, we can convert
back to the IEEE-specific forms during the SystemZElimCompare pass
by listing them in SystemZInstrInfo::getLoadAndTest.</pre>
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