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Factories code between numext::hypot and scalar_hyot_op functor.

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(grafted from 4213b63f5c
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This commit is contained in:
Gael Guennebaud
2018-04-04 15:12:43 +02:00
parent b18e2d422b
commit 90cd199d4b
2 changed files with 21 additions and 24 deletions
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20
Eigen/src/Core/MathFunctionsImpl.h
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@@ -71,6 +71,17 @@ T generic_fast_tanh_float(const T& a_x)
return pdiv(p, q);
}
template<typename RealScalar>
EIGEN_STRONG_INLINE
RealScalar positive_real_hypot(const RealScalar& x, const RealScalar& y)
{
EIGEN_USING_STD_MATH(sqrt);
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);
}
template<typename Scalar>
struct hypot_impl
@@ -79,14 +90,7 @@ struct hypot_impl
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);
return positive_real_hypot(abs(x), abs(y));
}
};