<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 - Wrong debug info generated at -O1 (-O0 is correct)"
href="https://bugs.llvm.org/show_bug.cgi?id=40833">40833</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>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 outer.c
void optimize_me_not() {}
$ cat a.c
int b;
short c;
int(a)(d, e) { return d + e; }
int main() {
char l_658 = 9;
for (; b < 26; b = b + 6) {
c = -28;
for (; c != 14; c = a(c, 7))
++l_658;
}
optimize_me_not();
}
$ clang-trunk a.c outer.c -O1 -g
(lldb) br set -p optimize_me_not
Breakpoint 1: where = a.out`main + 72 at 1.c:11:3, address = 0x00000000004004d8
(lldb) r
Process 14706 launched: '/home/davide/finished_reducing/a.out' (x86_64)
Process 14706 stopped
* thread #1, name = 'a.out', stop reason = breakpoint 1.1
frame #0: 0x00000000004004d8 a.out`main at 1.c:11:3
8 for (; c != 14; c = a(c, 7))
9 ++l_658;
10 }
-> 11 optimize_me_not();
12 }
(lldb) p l_658
(char) $0 = '\t'
$ clang-trunk 1.c outer.c -O0 -g
(lldb) br set -p optimize_me_not
Breakpoint 1: where = a.out`main + 129 at 1.c:11:3, address =
0x0000000000400521
(lldb) r
Process 22881 launched: '/home/davide/finished_reducing/a.out' (x86_64)
Process 22881 stopped
* thread #1, name = 'a.out', stop reason = breakpoint 1.1
frame #0: 0x0000000000400521 a.out`main at 1.c:11:3
8 for (; c != 14; c = a(c, 7))
9 ++l_658;
10 }
-> 11 optimize_me_not();
12 }
(lldb) p l_658
(char) $0 = '''</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>