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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [X86] long double to float128 conversion not working properly"
href="https://bugs.llvm.org/show_bug.cgi?id=50198">50198</a>
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<th>Summary</th>
<td>[X86] long double to float128 conversion not working properly
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Backend: X86
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>harald@gigawatt.nl
</td>
</tr>
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<th>CC</th>
<td>craig.topper@gmail.com, llvm-bugs@lists.llvm.org, llvm-dev@redking.me.uk, pengfei.wang@intel.com, spatel+llvm@rotateright.com
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<p>
<div>
<pre>$ cat test.c
int main(void) {
long double ld = 0;
__float128 f128 = ld;
int i = f128;
return i;
}
$ clang -m64 test.c && ./a.out && echo ok
ok
$ clang -mx32 test.c && ./a.out && echo ok
ok
$ clang -m32 test.c && ./a.out && echo ok
Segmentation fault (core dumped)
This is with clang 12.0.0. It does not seem to be a regression, godbolt.org
shows this to segfault as far back as clang 7 (and also with current trunk).
Before clang 7, the conversion was not supported and resulted in a compiler
error.</pre>
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