<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 - Loading a vector of i1 loads the wrong value"
href="https://bugs.llvm.org/show_bug.cgi?id=49942">49942</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Loading a vector of i1 loads the wrong value
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>10.0
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</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>Core LLVM classes
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>malle@umich.edu
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>This program:
```
@useFlag = private global <4 x i1> <i1 true, i1 true, i1 true, i1 true>
define i32 @get(i32 %arg) {
%ld = load <4 x i1>, <4 x i1>* @useFlag
%zx = zext <4 x i1> %ld to <4 x i32>
%ee = extractelement <4 x i32> %zx, i32 %arg
ret i32 %ee
}
define i32 @main() {
%g = call i32 @get(i32 2)
ret i32 %g
}
```
will return 0. I'd expect it to return 1 since it should load i1 true and then
zext that to i32 1.
Note that if you `get(i32 0)` then it returns 1 as expected. Also, with -O3
this returns 1 correctly since the load is optimized out.
Tested with:
```
$ clang-10 --version
clang version 10.0.0
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin
```
Sorry if this is a duplicate! I found some related notes on lists.llvm.org, but
not a bug report.</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>