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<body><span class="vcard"><a class="email" href="mailto:florian_hahn@apple.com" title="Florian Hahn <florian_hahn@apple.com>"> <span class="fn">Florian Hahn</span></a>
</span> changed
<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - Incorrect optimization of memmove in DSE"
href="https://bugs.llvm.org/show_bug.cgi?id=28013">bug 28013</a>
<br>
<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>What</th>
<th>Removed</th>
<th>Added</th>
</tr>
<tr>
<td style="text-align:right;">Status</td>
<td>NEW
</td>
<td>RESOLVED
</td>
</tr>
<tr>
<td style="text-align:right;">Resolution</td>
<td>---
</td>
<td>FIXED
</td>
</tr>
<tr>
<td style="text-align:right;">CC</td>
<td>
</td>
<td>florian_hahn@apple.com
</td>
</tr>
<tr>
<td style="text-align:right;">Fixed By Commit(s)</td>
<td>
</td>
<td>737fa40ffad15482801cc60271aed40dd5de9c95
</td>
</tr></table>
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<div>
<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - Incorrect optimization of memmove in DSE"
href="https://bugs.llvm.org/show_bug.cgi?id=28013#c1">Comment # 1</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - Incorrect optimization of memmove in DSE"
href="https://bugs.llvm.org/show_bug.cgi?id=28013">bug 28013</a>
from <span class="vcard"><a class="email" href="mailto:florian_hahn@apple.com" title="Florian Hahn <florian_hahn@apple.com>"> <span class="fn">Florian Hahn</span></a>
</span></b>
<pre>Looks like this works as expected with clang version 11.0.0
(<a href="mailto:git@github.com">git@github.com</a>:llvm/llvm-project.git 14ff6c896344e0440fc1cf7921d96515a9d50d8d)
A quick git log search surfaced the commit below as probably fixing it
commit 737fa40ffad15482801cc60271aed40dd5de9c95
Author: Sanjoy Das <<a href="mailto:sanjoy@playingwithpointers.com">sanjoy@playingwithpointers.com</a>>
Date: Tue Feb 20 23:19:34 2018 +0000
[DSE] Don't DSE stores that subsequent memmove calls read from
Summary:
We used to remove the first memmove in cases like this:
memmove(p, p+2, 8);
memmove(p, p+2, 8);
which is incorrect. Fix this by changing isPossibleSelfRead to what was
most
likely the intended behavior.
Historical note: the buggy code was added in
<a href="https://reviews.llvm.org/rL120974">https://reviews.llvm.org/rL120974</a>
to address PR8728.
Reviewers: rsmith
Subscribers: mcrosier, llvm-commits, jlebar
Differential Revision: <a href="https://reviews.llvm.org/D43425">https://reviews.llvm.org/D43425</a>
llvm-svn: 325641</pre>
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