<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 noalias and call which exits program"
href="https://llvm.org/bugs/show_bug.cgi?id=27857">27857</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>licm miscompile with noalias and call which exits program
</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 f() { exit(0); }
void (*ff)() = f;
void g(int* restrict a) {
for (int i = 0; i < 1000; ++i) {
ff();
*a += 1;
}
}
void (*gg)(int* restrict) = g;
int main() {
gg(0);
}
Works with gcc and clang -O0; crashes with clang -O2.
I think LICM is relying too much on "MayThrow" to conclude that function calls
will return normally.
Testcase is artificial.</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>