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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Missed cases by Memory SSA DSE, works with legacy DSE"
href="https://bugs.llvm.org/show_bug.cgi?id=47493">47493</a>
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<th>Summary</th>
<td>Missed cases by Memory SSA DSE, works with legacy DSE
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Windows NT
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Scalar Optimizations
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>david.bolvansky@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>define void @killed_by_load(i8* %a, i8* %b) {
bb0:
store i8 undef, i8* %a
br label %bb1
bb1:
%tmp = load i8, i8* %b
store i8 undef, i8* %a
ret void
}
-basic-aa -dse -enable-dse-memoryssa=false
define void @killed_by_load(i8* %a, i8* %b) {
store i8 undef, i8* %a, align 1
br label %bb1
bb1: ; preds = %bb0
store i8 undef, i8* %a, align 1
ret void
}
-basic-aa -dse -enable-dse-memoryssa=true
define void @killed_by_load(i8* %a, i8* %b) {
store i8 undef, i8* %a, align 1
br label %bb1
bb1: ; preds = %bb0
%tmp = load i8, i8* %b, align 1
store i8 undef, i8* %a, align 1
ret void
}</pre>
</div>
</p>
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