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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 code bug"
href="https://llvm.org/bugs/show_bug.cgi?id=27712">27712</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>wrong code bug
</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>
<tr>
<th>OS</th>
<td>All
</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>new bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>regehr@cs.utah.edu
</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>Sorry for the sucky test case, this is the best C-Reduce could do...
Johns-MacBook-Pro-2:reduce_wrong_719369 regehr$ clang -O0 small.c -w ; ./a.out
2
Johns-MacBook-Pro-2:reduce_wrong_719369 regehr$ gcc -O small.c -w ; ./a.out
2
Johns-MacBook-Pro-2:reduce_wrong_719369 regehr$ clang -O small.c -w ; ./a.out
0
Johns-MacBook-Pro-2:reduce_wrong_719369 regehr$ cat small.c
int printf(const char *, ...);
int a;
int b[3];
short c;
char d;
int main() {
{
char e;
unsigned f;
b[2] = d = 137;
b[0] = d;
lbl_1154:
for (;; a++)
if (b[a])
break;
e = b[0] < 0 ?: 2 << b[0];
f = e;
c = f < 2;
if (c) {
b[0] = 0;
goto lbl_1154;
}
}
printf("%d\n", a);
return 0;
}
Johns-MacBook-Pro-2:reduce_wrong_719369 regehr$ clang -v
clang version 3.9.0 (trunk 269180)
Target: x86_64-apple-darwin15.4.0
Thread model: posix
InstalledDir: /Users/regehr/llvm-install/bin</pre>
</div>
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