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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - gvn miscompile with restrict and call to exit()"
href="https://llvm.org/bugs/show_bug.cgi?id=27860">27860</a>
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<th>Summary</th>
<td>gvn miscompile with restrict and call to exit()
</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>
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<th>OS</th>
<td>Windows NT
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Scalar Optimizations
</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;
int r;
int g(int *__restrict x, int a) {
if (a) {
r = *x;
}
ff();
return *x;
}
int (*gg)(int *__restrict, int) = g;
int main() {
gg(0, 0);
}
Works with gcc and clang -O0, segfaults with clang -O2.
Load PRE is missing a check that the pointer is actually dereferenceable.
(Artificial testcase.)</pre>
</div>
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