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re PR libstdc++/62118 (cases under libstdc++-v3/testsuite/ext/ failed on aarch64/arm) 

2014-08-13  Paolo Carlini  <paolo.carlini@oracle.com>

	PR libstdc++/62118
	* include/ext/random.tcc (uniform_on_sphere_helper<2, _RealType>::
	operator()): Use std::hypot only when _GLIBCXX_USE_C99_MATH_TR1.

From-SVN: r213906
This commit is contained in:
Paolo Carlini 2014-08-13 11:24:35 +00:00 committed by Paolo Carlini
parent 0bcb976e6a
commit a3ee88517c
2 changed files with 14 additions and 2 deletions
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6
libstdc++-v3/ChangeLog
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@ -1,3 +1,9 @@
2014-08-13 Paolo Carlini <paolo.carlini@oracle.com>
PR libstdc++/62118
* include/ext/random.tcc (uniform_on_sphere_helper<2, _RealType>::
operator()): Use std::hypot only when _GLIBCXX_USE_C99_MATH_TR1.
2014-08-12 Jonathan Wakely <jwakely@redhat.com>
* include/bits/basic_string.h (getline): Qualify call to prevent ADL

10
libstdc++-v3/include/ext/random.tcc
View File

@ -1547,10 +1547,12 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
template<std::size_t _Dimen, typename _RealType>
class uniform_on_sphere_helper
{
typedef typename uniform_on_sphere_distribution<_Dimen, _RealType>::result_type result_type;
typedef typename uniform_on_sphere_distribution<_Dimen, _RealType>::
result_type result_type;
public:
template<typename _NormalDistribution, typename _UniformRandomNumberGenerator>
template<typename _NormalDistribution,
typename _UniformRandomNumberGenerator>
result_type operator()(_NormalDistribution& __nd,
_UniformRandomNumberGenerator& __urng)
{
@ -1604,9 +1606,13 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
}
while (__sq == _RealType(0) || __sq > _RealType(1));
#if _GLIBCXX_USE_C99_MATH_TR1
// Yes, we do not just use sqrt(__sq) because hypot() is more
// accurate.
auto __norm = std::hypot(__ret[0], __ret[1]);
#else
auto __norm = std::sqrt(__ret[0] * __ret[0] + __ret[1] * __ret[1]);
#endif
__ret[0] /= __norm;
__ret[1] /= __norm;