<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 - [InstCombine] non-inbounds GEP of null pointer miscompiled"
href="https://bugs.llvm.org/show_bug.cgi?id=48577">48577</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>[InstCombine] non-inbounds GEP of null pointer miscompiled
</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>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>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>nikita.ppv@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre><a href="https://llvm.godbolt.org/z/qec9oz">https://llvm.godbolt.org/z/qec9oz</a>
define i8 @test(i8* %p) {
%i = ptrtoint i8* %p to i64
%g = getelementptr i8, i8* null, i64 %i
%v = load i8, i8* %g, align 1
ret i8 %v
}
; RUN: opt -S -instcombine < %s
define i8 @test(i8* %p) {
store i8 undef, i8* null, align 536870912
ret i8 undef
}
As the GEP is not inbounds, the original code should be well-defined.
Rust bug report: <a href="https://github.com/rust-lang/rust/issues/80309">https://github.com/rust-lang/rust/issues/80309</a></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>