<html>
<head>
<base href="https://llvm.org/bugs/" />
</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 --- - Incorrect attribute inference w/operand bundles"
href="https://llvm.org/bugs/show_bug.cgi?id=26510">26510</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Incorrect attribute inference w/operand bundles
</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>Linux
</td>
</tr>
<tr>
<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>Scalar Optimizations
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>listmail@philipreames.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>With the example below, running this through O3 causes @test to be marked
readnone and the loads/stores to be deleted by other optimization passes as a
result. Tracing through print-after-all, it's clearly FunctionAttrs which is
doing the problematic transform, but I can not reproduce this standalone.
Worryingly, it looks like a different value is being returned from AA when run
through O3 or not (but with AA passes added).
declare void @foo() readnone
define i8* @test(i8* %p) {
%a = alloca i8*, align 8
store i8* %p, i8** %a, align 8
call void @foo() ["abc" (i8** %a)]
%reload = load i8*, i8** %a, align 8
ret i8* %reload
}
("abc" is a unknown deopt bundle type which could potentially write to the
specified address.)</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>