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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 --- - BasicAA says "PartialAlias" for access to two different record fields"
href="https://llvm.org/bugs/show_bug.cgi?id=27467">27467</a>
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<th>Summary</th>
<td>BasicAA says "PartialAlias" for access to two different record fields
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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>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>Interprocedural Analyses
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>mikael.holmen@ericsson.com
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<th>Classification</th>
<td>Unclassified
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</tr></table>
<p>
<div>
<pre>Running
opt -S -lint ./alias.ll
gives
Unusual: noalias argument aliases another argument
on the (silly) function:
%rec7 = type { i16, i16, i16 }
define void @fn1(i16* noalias %p1.1.par, i16* noalias %p2.2.par) {
%s.3 = alloca %rec7
%_tmp1 = getelementptr %rec7, %rec7* %s.3, i16 0, i32 1
%_tmp2 = getelementptr %rec7, %rec7* %s.3, i16 0, i32 2
call void @fn1(i16* %_tmp1, i16* %_tmp2)
ret void
}
If accessing fields 0 and 1 instead, with
%_tmp1 = getelementptr %rec7, %rec7* %s.3, i16 0, i32 0
%_tmp2 = getelementptr %rec7, %rec7* %s.3, i16 0, i32 1
we don't see the Lint complaint.</pre>
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