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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - float128 argument not passed with va_arg"
href="https://bugs.llvm.org/show_bug.cgi?id=47665">47665</a>
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<th>Summary</th>
<td>float128 argument not passed with va_arg
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>10.0
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</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>
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<th>Component</th>
<td>C
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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</tr>
<tr>
<th>Reporter</th>
<td>shibatch.sf.net@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>blitzrakete@gmail.com, dgregor@apple.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<p>
<div>
<pre>The following testcase shows 0 if compiled with -O1 option.
#include <stdio.h>
#include <stdarg.h>
void func(int n, ...) {
va_list ap;
va_start(ap, n);
__float128 q = va_arg(ap, __float128);
va_end(ap);
printf("%g\n", (double)q);
}
int main(void) {
__float128 q = 0.1Q;
func(0, q);
}
$ clang-10 -O1 vargf128.c
$ ./a.out
0
$ clang-10 -O0 vargf128.c
$ ./a.out
0.1</pre>
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