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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 --- - PowerPC64: fast isel doesn't sign extend 32bit signed constant"
href="https://llvm.org/bugs/show_bug.cgi?id=26381">26381</a>
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<th>Summary</th>
<td>PowerPC64: fast isel doesn't sign extend 32bit signed constant
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Backend: PowerPC
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>anton@samba.org
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Using the following testcase:
target datalayout = "e-m:e-i64:64-n32:64"
target triple = "powerpc64le-unknown-linux-gnu"
define internal signext i32 @foo() #0 {
ret i32 -125452974
}
-O1 sign extends the constant:
# llc -O1 test.ll
...
foo:
lis 3, -1915
ori 3, 3, 48466
blr
-O1 -fast-isel zero extends the constant:
# llc -O1 -fast-isel test.ll
...
foo:
lis 3, 31810
ori 3, 3, 57001
sldi 3, 3, 1
blr</pre>
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