<html>
<head>
<base href="https://llvm.org/bugs/" />
</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 --- - licm miscompile with restrict and throw"
href="https://llvm.org/bugs/show_bug.cgi?id=27952">27952</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>licm miscompile with restrict and throw
</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>Windows NT
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Loop Optimizer
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>eli.friedman@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Testcase:
#include <stdlib.h>
void t() { throw 0; }
void (*tt)() = t;
void f(int*__restrict a, int x, bool y) {
for (int i = 0; i < x; ++i) {
*a += 1;
if (y) tt();
}
}
void (*ff)(int*__restrict,int,bool) = f;
int main() {
int a = 0;
try {
ff(&a, 10, true);
} catch (...) {
if (a != 1) abort();
}
}
Runs to completion with clang -O0, aborts with clang -O2.
The problem is incomplete safety checks in LICM.
(Artificial testcase.)</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>