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<base href="https://llvm.org/bugs/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Wrong constant folding"
href="https://llvm.org/bugs/show_bug.cgi?id=25649">25649</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Wrong constant folding
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>MacOS X
</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>LLVM Codegen
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>ishiura-compiler@ml.kwansei.ac.jp
</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>LLVM + clang-3.8 miscompiles the following code.
$ cat error.c
int a = 0;
long long b = 1LL;
long long c = 3LL;
volatile unsigned int d = 0U;
int f = 0;
int main ( void )
{
int e = 6 / ((unsigned int)b * (3LL * (3 * c == 9)) << (1 ^ a || d >= 0));
if ( e != 1 ) { f = e; __builtin_abort(); }
return 0;
}
$ clang-3.8 error.c -m32 -w -O3
$ ./a.out
zsh: abort ./a.out
$ clang-3.8 -v
clang version 3.8.0 (trunk 254118)
Target: x86_64-apple-darwin14.5.0
Thread model: posix
InstalledDir: /Users/home/clang/bin</pre>
</div>
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