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bug #1521: avoid signalling NaN in hypot and make it std::complex<> friendly.

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(grafted from e116f6847e3cd9d16ea3be14c2b7efbd0a1c2b0b
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This commit is contained in:
Gael Guennebaud 2018-04-04 13:47:23 +02:00
parent 892c0a79ce
commit b18e2d422b
2 changed files with 20 additions and 25 deletions
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26
Eigen/src/Core/MathFunctions.h
View File

@ -348,31 +348,7 @@ struct norm1_retval
* Implementation of hypot *
****************************************************************************/
template<typename Scalar>
struct hypot_impl
{
typedef typename NumTraits<Scalar>::Real RealScalar;
static inline RealScalar run(const Scalar& x, const Scalar& y)
{
EIGEN_USING_STD_MATH(abs);
EIGEN_USING_STD_MATH(sqrt);
RealScalar _x = abs(x);
RealScalar _y = abs(y);
Scalar p, qp;
if(_x>_y)
{
p = _x;
qp = _y / p;
}
else
{
p = _y;
qp = _x / p;
}
if(p==RealScalar(0)) return RealScalar(0);
return p * sqrt(RealScalar(1) + qp*qp);
}
};
template<typename Scalar> struct hypot_impl;
template<typename Scalar>
struct hypot_retval

19
Eigen/src/Core/MathFunctionsImpl.h
View File

@ -71,6 +71,25 @@ T generic_fast_tanh_float(const T& a_x)
return pdiv(p, q);
}
template<typename Scalar>
struct hypot_impl
{
typedef typename NumTraits<Scalar>::Real RealScalar;
static inline RealScalar run(const Scalar& x, const Scalar& y)
{
EIGEN_USING_STD_MATH(abs);
EIGEN_USING_STD_MATH(sqrt);
RealScalar _x = abs(x);
RealScalar _y = abs(y);
RealScalar p, qp;
p = numext::maxi(_x,_y);
if(p==RealScalar(0)) return RealScalar(0);
qp = numext::mini(_y,_x) / p;
return p * sqrt(RealScalar(1) + qp*qp);
}
};
} // end namespace internal
} // end namespace Eigen