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<base href="http://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Integer not passed correctly in vararg"
href="http://llvm.org/bugs/show_bug.cgi?id=18727">18727</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Integer not passed correctly in vararg
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>MacOS X
</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>
<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>llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Clang 3.5 (based on LLVM 3.5svn) for x86_64 target miscompiles the following
code.
$ cat error.c
#include <stdarg.h>
union U0 { long m0[2]; };
union U1 { int m0; };
struct S0 { int m0[5]; };
struct S0 func(struct S0 x0, ... )
{
va_list ap;
va_start(ap, x0);
union U0 x1 = va_arg(ap, union U0);
union U0 x2 = va_arg(ap, union U0);
union U1 x3 = va_arg(ap, union U1);
int x4 = va_arg(ap, int);
va_end(ap);
if( x4 != 1 ) { __builtin_abort(); }
return x0;
}
int main(void)
{
struct S0 x0 = {{1,1,1,1,1}};
union U0 x1 = {{1,1}};
union U1 x2 = {1};
func(x0, x1, x1, x2, x0.m0[0]);
return 0;
}
$ clang error.c
$ ./a.out
Abort trap: 6
The value of x4 was 0 instead of 1.
There was no problem with an i686 target.
$ clang -v
clang version 3.5 (trunk 200763)
Target: x86_64-apple-darwin13.0.0
Thread model: posix</pre>
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