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<base href="http://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - SROA fails to eliminate alloca"
href="http://llvm.org/bugs/show_bug.cgi?id=16053">16053</a>
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<tr>
<th>Summary</th>
<td>SROA fails to eliminate alloca
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</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>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>new bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>baldrick@free.fr
</td>
</tr>
<tr>
<th>CC</th>
<td>chandlerc@gmail.com, llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=10535" name="attach_10535" title="testcase .ll">attachment 10535</a> <a href="attachment.cgi?id=10535&action=edit" title="testcase .ll">[details]</a></span>
testcase .ll
SROA fails to eliminate the alloca in this function. This is the IR produced
for a store to a bitfield of float type (allowed in Ada). SROA should
understand that bits 0 .. 32 of %.0.load are just the bits of %f, and the other
bits are all undef.
define i64 @bf__w__2(i64 %x.0, float %f) {
entry:
%0 = alloca i40, align 8
%1 = trunc i64 %x.0 to i40
%.0.cast3 = bitcast i40* %0 to float*
store float %f, float* %.0.cast3, align 8
%.0.load = load i40* %0, align 8
%2 = shl i40 %.0.load, 2
%3 = and i40 %2, 17179869180
%4 = and i40 %1, -17179869181
%5 = or i40 %3, %4
%.0.insert.ext = zext i40 %5 to i64
ret i64 %.0.insert.ext
}</pre>
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