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<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/-O2/-O3 (-O0 is correct)"
href="https://bugs.llvm.org/show_bug.cgi?id=40834">40834</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Wrong debug info generated at -O1/-O2/-O3 (-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 2.c
int a;
int *b = &a;
int main() {
int c = *b;
short l_504 = 1;
if (c) {
l_504 = -23;
b = 0;
}
optimize_me_not();
}
$ cat outer.c
void optimize_me_not() {}
$ lldb-trunk ./a.out
(lldb) target create "./a.out"
Current executable set to './a.out' (x86_64).
(lldb) br set -p optimize_me_not
Breakpoint 1: where = a.out`main + 62 at 2.c:10:3, address = 0x00000000004004be
(lldb) r
Process 1246 launched: '/home/davide/finished_reducing/a.out' (x86_64)
Process 1246 stopped
* thread #1, name = 'a.out', stop reason = breakpoint 1.1
frame #0: 0x00000000004004be a.out`main at 2.c:10:3
7 l_504 = -23;
8 b = 0;
9 }
-> 10 optimize_me_not();
11 }
(lldb) p l_504
(short) $0 = 1
(lldb) br set -p optimize_me_not
Breakpoint 1: where = a.out`main + 24 at 2.c:10:3, address = 0x0000000000400498
(lldb) r
Process 4538 launched: '/home/davide/finished_reducing/a.out' (x86_64)
Process 4538 stopped
* thread #1, name = 'a.out', stop reason = breakpoint 1.1
frame #0: 0x0000000000400498 a.out`main at 2.c:10:3
7 l_504 = -23;
8 b = 0;
9 }
-> 10 optimize_me_not();
11 }
(lldb) p l_504
(short) $0 = -23</pre>
</div>
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