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Started to model the cost of divisions more accurately.

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This commit is contained in:
Benoit Steiner
2016-03-25 11:02:56 -07:00
parent a86c9f037b
commit d94f6ba965
2 changed files with 28 additions and 1 deletions
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12
Eigen/src/Core/functors/BinaryFunctors.h
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@@ -238,7 +238,13 @@ template<typename Scalar> struct scalar_hypot_op {
};
template<typename Scalar>
struct functor_traits<scalar_hypot_op<Scalar> > {
enum { Cost = 5 * NumTraits<Scalar>::MulCost, PacketAccess=0 };
enum
{
Cost = 3 * NumTraits<Scalar>::AddCost +
2 * NumTraits<Scalar>::MulCost +
2 * NumTraits<Scalar>::template Div<false>::Cost,
PacketAccess = false
};
};
/** \internal
@@ -564,6 +570,10 @@ struct scalar_inverse_mult_op {
{ return internal::pdiv(pset1<Packet>(m_other),a); }
Scalar m_other;
};
template<typename Scalar>
struct functor_traits<scalar_inverse_mult_op<Scalar> >
{ enum { PacketAccess = packet_traits<Scalar>::HasDiv, Cost = NumTraits<Scalar>::template Div<PacketAccess>::Cost }; };
} // end namespace internal