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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 - DSE fails to eliminate store of same value"
href="https://bugs.llvm.org/show_bug.cgi?id=49927">49927</a>
</td>
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<tr>
<th>Summary</th>
<td>DSE fails to eliminate store of same value
</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>Windows NT
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Scalar Optimizations
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<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>void dse_missed (int *q, int *p)
{
int y = *p;
*q = y;
*p = y;
}
gcc
dse_missed(int*, int*):
mov eax, DWORD PTR [rsi]
mov DWORD PTR [rdi], eax
ret
dse_missed(int*, int*): # @dse_missed(int*, int*)
mov eax, dword ptr [rsi]
mov dword ptr [rdi], eax
mov dword ptr [rsi], eax
ret
<a href="https://godbolt.org/z/8Pb9ne4vh">https://godbolt.org/z/8Pb9ne4vh</a></pre>
</div>
</p>
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