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Set cost of constant expression to 0 (the cost should be amortized through the expression)

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This commit is contained in:
Gael Guennebaud 2016-06-14 11:29:06 +02:00
parent deb8306e60
commit f5b1c73945
1 changed files with 2 additions and 1 deletions
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Eigen/src/Core/functors/NullaryFunctors.h
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@ -26,7 +26,8 @@ struct scalar_constant_op {
};
template<typename Scalar>
struct functor_traits<scalar_constant_op<Scalar> >
{ enum { Cost = 1, PacketAccess = packet_traits<Scalar>::Vectorizable, IsRepeatable = true }; };
{ enum { Cost = 0 /* as the constant value should be loaded in register only once for the whole expression */,
PacketAccess = packet_traits<Scalar>::Vectorizable, IsRepeatable = true }; };
template<typename Scalar> struct scalar_identity_op {
EIGEN_EMPTY_STRUCT_CTOR(scalar_identity_op)