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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - miscompile from r248638"
href="https://llvm.org/bugs/show_bug.cgi?id=24952">24952</a>
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</tr>
<tr>
<th>Summary</th>
<td>miscompile from r248638
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Windows NT
</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>new bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>yaron.keren@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, sanjoy@playingwithpointers.com
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>The boost example,
#include <boost/multiprecision/cpp_bin_float.hpp>
#include <boost/math/special_functions/gamma.hpp>
#include <iostream>
int main() {
using namespace boost::multiprecision;
std::cout << boost::math::tgamma(cpp_bin_float_100(1000)) << std::endl;
}
produce correct output
bin/clang++ -O2 -std=c++11 -isystem include cpp_bin_float_snips.cpp
./a.out
4.02387e+2564
with pre-r248638 clang and gcc 5.1.0.
>From r248638,
./a.out
terminate called after throwing an instance of
'boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<std::range_error>
<span class="quote">>'</span >
what(): No bits were set in the operand.
this is on Ubunto 14.04 64 bit, boost 1.57.</pre>
</div>
</p>
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