<html>
<head>
<base href="https://bugs.llvm.org/">
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - VectorCombine index optimization isn't poison-safe"
href="https://bugs.llvm.org/show_bug.cgi?id=50949">50949</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>VectorCombine index optimization isn't poison-safe
</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>
<tr>
<th>OS</th>
<td>Windows NT
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Scalar Optimizations
</td>
</tr>
<tr>
<th>Assignee</th>
<td>florian_hahn@apple.com
</td>
</tr>
<tr>
<th>Reporter</th>
<td>efriedma@quicinc.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre><a href="https://reviews.llvm.org/D102476#inline-996311">https://reviews.llvm.org/D102476#inline-996311</a> . For reference, IR that is
mis-optimized:
define void @insert_store_nonconst_index_known_valid_by_and(<16 x i8>* %q, i8
zeroext %s, i32 %idx) {
entry:
%0 = load <16 x i8>, <16 x i8>* %q
%idx.clamped = and i32 %idx, 7
%vecins = insertelement <16 x i8> %0, i8 %s, i32 %idx.clamped
store <16 x i8> %vecins, <16 x i8>* %q
ret void
}</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are on the CC list for the bug.</li>
</ul>
</body>
</html>