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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - "X86 DAG->DAG Instruction Selection on function" triggers wrong code"
href="https://bugs.llvm.org/show_bug.cgi?id=35765">35765</a>
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<th>Summary</th>
<td>"X86 DAG->DAG Instruction Selection on function" triggers wrong code
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</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>All
</td>
</tr>
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<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>new bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>babokin@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
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<pre>clang trunk, x86_64, rev321482
<span class="quote">> cat f.cpp</span >
struct S {
unsigned short m : 11;
};
long long int ll;
S s1 = { 1403 };
long long int x = 2651237805702985558L;
S s2 = { 902 };
void foo() {
ll = (4 << (s1.m - 1398)) ^ (unsigned short)(x | ~s2.m);
}
int main() {
foo();
__builtin_printf("%lld\n", ll);
return 0;
}
<span class="quote">> clang++ f.cpp -std=c++11 -o out -O0; ./out</span >
65535
<span class="quote">> clang++ f.cpp -std=c++11 -o out -O2; ./out</span >
-1
clang 5.0 produces correct result, so this is regression.</pre>
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