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<base href="https://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Incorrect call slot optimization in memcpyopt with noalias"
href="https://llvm.org/bugs/show_bug.cgi?id=27849">27849</a>
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<th>Summary</th>
<td>Incorrect call slot optimization in memcpyopt with noalias
</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>
<tr>
<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>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Testcase:
#include <cstdlib>
bool b = true;
__attribute((noinline))
void bar(int* x) { *x = 10; if (b) throw 0; }
__attribute((noinline))
void foo(int& __restrict x) {
int t;
bar(&t);
x = t;
}
int main() {
int x = 1;
try {
foo(x);
} catch (...) {}
if (x != 1) abort();
}
Works correctly with gcc and clang -O0; aborts with clang -O2.
Call slot optimization is being too aggressive in memcpyopt.</pre>
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</p>
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