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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 --- - Incorrect code of variable arguments"
href="http://llvm.org/bugs/show_bug.cgi?id=20045">20045</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Incorrect code of variable arguments
</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>
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<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>llvmbugs@cs.uiuc.edu
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Clang 3.5.0 (based on LLVM 3.5svn) for x86_64 target miscompiles the following
code.
% cat error.c
#include <stdarg.h>
struct S { float m0[2]; int m1; };
void func1( int fx, ... )
{
struct S fs;
va_list ap;
va_start(ap, fx);
fs = va_arg(ap, struct S);
va_end(ap);
if( fs.m1 != 1 ) { __builtin_abort(); }
}
int main( void )
{
int x = 1;
struct S s = {{1.0F,1.0F},1};
func1(x, s);
return 0;
}
% clang error.c
% ./a.out
zsh: abort ./a.out
% clang -v
clang version 3.5.0 (trunk 210625)
Target: x86_64-apple-darwin13.2.0
Thread model: posix
The value of fs.m1 was 1065353216 instead of 1.</pre>
</div>
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