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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 --- - [ppc] hoist repeated constant for better code size and speed"
href="https://llvm.org/bugs/show_bug.cgi?id=27203">27203</a>
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<th>Summary</th>
<td>[ppc] hoist repeated constant for better code size and speed
</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>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Backend: PowerPC
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>spatel+llvm@rotateright.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Filing a sentimental PPC sibling report for <a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [x86] optimizing for size results in bigger code because of repeated constant"
href="show_bug.cgi?id=27202">bug 27202</a>:
define i1 @foo(i32 %i) {
%and = and i32 %i, 305419896
%cmp = icmp eq i32 %and, 305419896
ret i1 %cmp
}
$ ./llc maskcmp.ll -mtriple=powerpc64 -o -
...
lis 4, 4660
ori 4, 4, 22136
and 3, 3, 4
xoris 3, 3, 4660 <--- why bother?
cmplwi 3, 22136 <--- use cmplw instead
li 3, 1
bclr 12, 2, 0
# BB#1:
li 3, 0
blr</pre>
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