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<head>
<base href="https://bugs.llvm.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Wrong debug info generated at -O1 (-O0 is correct)"
href="https://bugs.llvm.org/show_bug.cgi?id=40944">40944</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Wrong debug info generated at -O1 (-O0 is correct)
</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>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Keywords</th>
<td>wrong-debug
</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>davide@freebsd.org
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>$ cat 1.c
unsigned char a;
char b = -1;
int main() {
int l_135 = 1102062129;
l_135 = (a = b) | 9;
optimize_me_not();
}
$ cat outer.c
void optimize_me_not() {}
### -O0
* thread #1, name = 'a.out', stop reason = breakpoint 2.1
frame #0: 0x00000000004004a6 a.out`main at 1.c:6:3
3 int main() {
4 int l_135 = 1102062129;
5 l_135 = (a = b) | 9;
-> 6 optimize_me_not();
7 }
(lldb) frame var
(int) l_135 = 255
### -O1
* thread #1, name = 'a.out', stop reason = breakpoint 1.1
frame #0: 0x000000000040048d a.out`main at 1.c:6:3
3 int main() {
4 int l_135 = 1102062129;
5 l_135 = (a = b) | 9;
-> 6 optimize_me_not();
7 }
(lldb) frame var
(lldb) frame var l_135
(int) l_135 = 1102062129
$ clang-trunk --version
clang version 9.0.0 (trunk 355281)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/bin
$ lldb-trunk --version
lldb version 9.0.0 (<a href="https://llvm.org/svn/llvm-project/lldb/trunk">https://llvm.org/svn/llvm-project/lldb/trunk</a> revision
355281)
clang revision 355281
llvm revision 355281</pre>
</div>
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