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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - FunctionAttrs marks inaccessiblememonly as readnone"
href="https://llvm.org/bugs/show_bug.cgi?id=26021">26021</a>
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<th>Summary</th>
<td>FunctionAttrs marks inaccessiblememonly as readnone
</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>
</tr>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
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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>Global Analyses
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>deadalnix@gmail.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>Sample IR:
define i32 @_D8test01824mainFMZi() {
body:
%0 = tail call noalias i32* @allocmemory()
store i32 7, i32* %0, align 4
%1 = tail call noalias i32* @allocmemory()
%2 = bitcast i32* %1 to i32**
store i32* %0, i32** %2, align 8
%3 = tail call noalias i32* @allocmemory()
%4 = bitcast i32* %3 to i32**
store i32* %0, i32** %4, align 8
%5 = load i32, i32* %0, align 4
%6 = add i32 %5, 1
store i32 %6, i32* %0, align 4
%7 = add i32 %5, %6
ret i32 %7
}
declare noalias i32* @allocmemory() #0
attributes #0 = { inaccessiblememonly }
For some reason, FunctionAttrs want to mark allocmemory as readnone. It turns
out that getModRefBehavior somehow ends up being 0 for it. When the pass it ran
in isolation, everything is fine, but when ran in combination with other passes
using -01, it fails.
I was unable to reduce the set of passes that needs to run.</pre>
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