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Cleanup cost of tanh

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This commit is contained in:
Gael Guennebaud 2016-08-23 14:39:55 +02:00
parent b3151bca40
commit ef3de20481
1 changed files with 4 additions and 7 deletions
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11
Eigen/src/Core/functors/UnaryFunctors.h
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@ -1,7 +1,7 @@
// This file is part of Eigen, a lightweight C++ template library
// for linear algebra.
//
// Copyright (C) 2008-2010 Gael Guennebaud <gael.guennebaud@inria.fr>
// Copyright (C) 2008-2016 Gael Guennebaud <gael.guennebaud@inria.fr>
//
// This Source Code Form is subject to the terms of the Mozilla
// Public License v. 2.0. If a copy of the MPL was not distributed
@ -507,21 +507,18 @@ template <typename Scalar>
struct functor_traits<scalar_tanh_op<Scalar> > {
enum {
PacketAccess = packet_traits<Scalar>::HasTanh,
Cost = (PacketAccess && (!is_same<Scalar, std::complex<float> >::value) &&
(!is_same<Scalar, std::complex<double> >::value)
Cost = ( (EIGEN_FAST_MATH && is_same<Scalar,float>::value)
// The following numbers are based on the AVX implementation,
#ifdef EIGEN_VECTORIZE_FMA
// Haswell can issue 2 add/mul/madd per cycle.
// 9 pmadd, 2 pmul, 1 div, 2 other
? (2 * NumTraits<Scalar>::AddCost +
6 * NumTraits<Scalar>::MulCost +
NumTraits<Scalar>::template Div<
packet_traits<Scalar>::HasDiv>::Cost)
NumTraits<Scalar>::template Div<packet_traits<Scalar>::HasDiv>::Cost)
#else
? (11 * NumTraits<Scalar>::AddCost +
11 * NumTraits<Scalar>::MulCost +
NumTraits<Scalar>::template Div<
packet_traits<Scalar>::HasDiv>::Cost)
NumTraits<Scalar>::template Div<packet_traits<Scalar>::HasDiv>::Cost)
#endif
// This number assumes a naive implementation of tanh
: (6 * NumTraits<Scalar>::AddCost +