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Diffstat (limited to 'runtimes/nn/depend/external/eigen/Eigen/src/Core/GenericPacketMath.h')
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1 files changed, 593 insertions, 0 deletions
diff --git a/runtimes/nn/depend/external/eigen/Eigen/src/Core/GenericPacketMath.h b/runtimes/nn/depend/external/eigen/Eigen/src/Core/GenericPacketMath.h new file mode 100644 index 000000000..029f8ac36 --- /dev/null +++ b/runtimes/nn/depend/external/eigen/Eigen/src/Core/GenericPacketMath.h @@ -0,0 +1,593 @@ +// This file is part of Eigen, a lightweight C++ template library +// for linear algebra. +// +// Copyright (C) 2008 Gael Guennebaud <gael.guennebaud@inria.fr> +// Copyright (C) 2006-2008 Benoit Jacob <jacob.benoit.1@gmail.com> +// +// 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 +// with this file, You can obtain one at http://mozilla.org/MPL/2.0/. + +#ifndef EIGEN_GENERIC_PACKET_MATH_H +#define EIGEN_GENERIC_PACKET_MATH_H + +namespace Eigen { + +namespace internal { + +/** \internal + * \file GenericPacketMath.h + * + * Default implementation for types not supported by the vectorization. + * In practice these functions are provided to make easier the writing + * of generic vectorized code. + */ + +#ifndef EIGEN_DEBUG_ALIGNED_LOAD +#define EIGEN_DEBUG_ALIGNED_LOAD +#endif + +#ifndef EIGEN_DEBUG_UNALIGNED_LOAD +#define EIGEN_DEBUG_UNALIGNED_LOAD +#endif + +#ifndef EIGEN_DEBUG_ALIGNED_STORE +#define EIGEN_DEBUG_ALIGNED_STORE +#endif + +#ifndef EIGEN_DEBUG_UNALIGNED_STORE +#define EIGEN_DEBUG_UNALIGNED_STORE +#endif + +struct default_packet_traits +{ + enum { + HasHalfPacket = 0, + + HasAdd = 1, + HasSub = 1, + HasMul = 1, + HasNegate = 1, + HasAbs = 1, + HasArg = 0, + HasAbs2 = 1, + HasMin = 1, + HasMax = 1, + HasConj = 1, + HasSetLinear = 1, + HasBlend = 0, + + HasDiv = 0, + HasSqrt = 0, + HasRsqrt = 0, + HasExp = 0, + HasLog = 0, + HasLog1p = 0, + HasLog10 = 0, + HasPow = 0, + + HasSin = 0, + HasCos = 0, + HasTan = 0, + HasASin = 0, + HasACos = 0, + HasATan = 0, + HasSinh = 0, + HasCosh = 0, + HasTanh = 0, + HasLGamma = 0, + HasDiGamma = 0, + HasZeta = 0, + HasPolygamma = 0, + HasErf = 0, + HasErfc = 0, + HasIGamma = 0, + HasIGammac = 0, + HasBetaInc = 0, + + HasRound = 0, + HasFloor = 0, + HasCeil = 0, + + HasSign = 0 + }; +}; + +template<typename T> struct packet_traits : default_packet_traits +{ + typedef T type; + typedef T half; + enum { + Vectorizable = 0, + size = 1, + AlignedOnScalar = 0, + HasHalfPacket = 0 + }; + enum { + HasAdd = 0, + HasSub = 0, + HasMul = 0, + HasNegate = 0, + HasAbs = 0, + HasAbs2 = 0, + HasMin = 0, + HasMax = 0, + HasConj = 0, + HasSetLinear = 0 + }; +}; + +template<typename T> struct packet_traits<const T> : packet_traits<T> { }; + +template <typename Src, typename Tgt> struct type_casting_traits { + enum { + VectorizedCast = 0, + SrcCoeffRatio = 1, + TgtCoeffRatio = 1 + }; +}; + + +/** \internal \returns static_cast<TgtType>(a) (coeff-wise) */ +template <typename SrcPacket, typename TgtPacket> +EIGEN_DEVICE_FUNC inline TgtPacket +pcast(const SrcPacket& a) { + return static_cast<TgtPacket>(a); +} +template <typename SrcPacket, typename TgtPacket> +EIGEN_DEVICE_FUNC inline TgtPacket +pcast(const SrcPacket& a, const SrcPacket& /*b*/) { + return static_cast<TgtPacket>(a); +} + +template <typename SrcPacket, typename TgtPacket> +EIGEN_DEVICE_FUNC inline TgtPacket +pcast(const SrcPacket& a, const SrcPacket& /*b*/, const SrcPacket& /*c*/, const SrcPacket& /*d*/) { + return static_cast<TgtPacket>(a); +} + +/** \internal \returns a + b (coeff-wise) */ +template<typename Packet> EIGEN_DEVICE_FUNC inline Packet +padd(const Packet& a, + const Packet& b) { return a+b; } + +/** \internal \returns a - b (coeff-wise) */ +template<typename Packet> EIGEN_DEVICE_FUNC inline Packet +psub(const Packet& a, + const Packet& b) { return a-b; } + +/** \internal \returns -a (coeff-wise) */ +template<typename Packet> EIGEN_DEVICE_FUNC inline Packet +pnegate(const Packet& a) { return -a; } + +/** \internal \returns conj(a) (coeff-wise) */ + +template<typename Packet> EIGEN_DEVICE_FUNC inline Packet +pconj(const Packet& a) { return numext::conj(a); } + +/** \internal \returns a * b (coeff-wise) */ +template<typename Packet> EIGEN_DEVICE_FUNC inline Packet +pmul(const Packet& a, + const Packet& b) { return a*b; } + +/** \internal \returns a / b (coeff-wise) */ +template<typename Packet> EIGEN_DEVICE_FUNC inline Packet +pdiv(const Packet& a, + const Packet& b) { return a/b; } + +/** \internal \returns the min of \a a and \a b (coeff-wise) */ +template<typename Packet> EIGEN_DEVICE_FUNC inline Packet +pmin(const Packet& a, + const Packet& b) { return numext::mini(a, b); } + +/** \internal \returns the max of \a a and \a b (coeff-wise) */ +template<typename Packet> EIGEN_DEVICE_FUNC inline Packet +pmax(const Packet& a, + const Packet& b) { return numext::maxi(a, b); } + +/** \internal \returns the absolute value of \a a */ +template<typename Packet> EIGEN_DEVICE_FUNC inline Packet +pabs(const Packet& a) { using std::abs; return abs(a); } + +/** \internal \returns the phase angle of \a a */ +template<typename Packet> EIGEN_DEVICE_FUNC inline Packet +parg(const Packet& a) { using numext::arg; return arg(a); } + +/** \internal \returns the bitwise and of \a a and \a b */ +template<typename Packet> EIGEN_DEVICE_FUNC inline Packet +pand(const Packet& a, const Packet& b) { return a & b; } + +/** \internal \returns the bitwise or of \a a and \a b */ +template<typename Packet> EIGEN_DEVICE_FUNC inline Packet +por(const Packet& a, const Packet& b) { return a | b; } + +/** \internal \returns the bitwise xor of \a a and \a b */ +template<typename Packet> EIGEN_DEVICE_FUNC inline Packet +pxor(const Packet& a, const Packet& b) { return a ^ b; } + +/** \internal \returns the bitwise andnot of \a a and \a b */ +template<typename Packet> EIGEN_DEVICE_FUNC inline Packet +pandnot(const Packet& a, const Packet& b) { return a & (!b); } + +/** \internal \returns a packet version of \a *from, from must be 16 bytes aligned */ +template<typename Packet> EIGEN_DEVICE_FUNC inline Packet +pload(const typename unpacket_traits<Packet>::type* from) { return *from; } + +/** \internal \returns a packet version of \a *from, (un-aligned load) */ +template<typename Packet> EIGEN_DEVICE_FUNC inline Packet +ploadu(const typename unpacket_traits<Packet>::type* from) { return *from; } + +/** \internal \returns a packet with constant coefficients \a a, e.g.: (a,a,a,a) */ +template<typename Packet> EIGEN_DEVICE_FUNC inline Packet +pset1(const typename unpacket_traits<Packet>::type& a) { return a; } + +/** \internal \returns a packet with constant coefficients \a a[0], e.g.: (a[0],a[0],a[0],a[0]) */ +template<typename Packet> EIGEN_DEVICE_FUNC inline Packet +pload1(const typename unpacket_traits<Packet>::type *a) { return pset1<Packet>(*a); } + +/** \internal \returns a packet with elements of \a *from duplicated. + * For instance, for a packet of 8 elements, 4 scalars will be read from \a *from and + * duplicated to form: {from[0],from[0],from[1],from[1],from[2],from[2],from[3],from[3]} + * Currently, this function is only used for scalar * complex products. + */ +template<typename Packet> EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE Packet +ploaddup(const typename unpacket_traits<Packet>::type* from) { return *from; } + +/** \internal \returns a packet with elements of \a *from quadrupled. + * For instance, for a packet of 8 elements, 2 scalars will be read from \a *from and + * replicated to form: {from[0],from[0],from[0],from[0],from[1],from[1],from[1],from[1]} + * Currently, this function is only used in matrix products. + * For packet-size smaller or equal to 4, this function is equivalent to pload1 + */ +template<typename Packet> EIGEN_DEVICE_FUNC inline Packet +ploadquad(const typename unpacket_traits<Packet>::type* from) +{ return pload1<Packet>(from); } + +/** \internal equivalent to + * \code + * a0 = pload1(a+0); + * a1 = pload1(a+1); + * a2 = pload1(a+2); + * a3 = pload1(a+3); + * \endcode + * \sa pset1, pload1, ploaddup, pbroadcast2 + */ +template<typename Packet> EIGEN_DEVICE_FUNC +inline void pbroadcast4(const typename unpacket_traits<Packet>::type *a, + Packet& a0, Packet& a1, Packet& a2, Packet& a3) +{ + a0 = pload1<Packet>(a+0); + a1 = pload1<Packet>(a+1); + a2 = pload1<Packet>(a+2); + a3 = pload1<Packet>(a+3); +} + +/** \internal equivalent to + * \code + * a0 = pload1(a+0); + * a1 = pload1(a+1); + * \endcode + * \sa pset1, pload1, ploaddup, pbroadcast4 + */ +template<typename Packet> EIGEN_DEVICE_FUNC +inline void pbroadcast2(const typename unpacket_traits<Packet>::type *a, + Packet& a0, Packet& a1) +{ + a0 = pload1<Packet>(a+0); + a1 = pload1<Packet>(a+1); +} + +/** \internal \brief Returns a packet with coefficients (a,a+1,...,a+packet_size-1). */ +template<typename Packet> EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE Packet +plset(const typename unpacket_traits<Packet>::type& a) { return a; } + +/** \internal copy the packet \a from to \a *to, \a to must be 16 bytes aligned */ +template<typename Scalar, typename Packet> EIGEN_DEVICE_FUNC inline void pstore(Scalar* to, const Packet& from) +{ (*to) = from; } + +/** \internal copy the packet \a from to \a *to, (un-aligned store) */ +template<typename Scalar, typename Packet> EIGEN_DEVICE_FUNC inline void pstoreu(Scalar* to, const Packet& from) +{ (*to) = from; } + + template<typename Scalar, typename Packet> EIGEN_DEVICE_FUNC inline Packet pgather(const Scalar* from, Index /*stride*/) + { return ploadu<Packet>(from); } + + template<typename Scalar, typename Packet> EIGEN_DEVICE_FUNC inline void pscatter(Scalar* to, const Packet& from, Index /*stride*/) + { pstore(to, from); } + +/** \internal tries to do cache prefetching of \a addr */ +template<typename Scalar> EIGEN_DEVICE_FUNC inline void prefetch(const Scalar* addr) +{ +#ifdef __CUDA_ARCH__ +#if defined(__LP64__) + // 64-bit pointer operand constraint for inlined asm + asm(" prefetch.L1 [ %1 ];" : "=l"(addr) : "l"(addr)); +#else + // 32-bit pointer operand constraint for inlined asm + asm(" prefetch.L1 [ %1 ];" : "=r"(addr) : "r"(addr)); +#endif +#elif (!EIGEN_COMP_MSVC) && (EIGEN_COMP_GNUC || EIGEN_COMP_CLANG || EIGEN_COMP_ICC) + __builtin_prefetch(addr); +#endif +} + +/** \internal \returns the first element of a packet */ +template<typename Packet> EIGEN_DEVICE_FUNC inline typename unpacket_traits<Packet>::type pfirst(const Packet& a) +{ return a; } + +/** \internal \returns a packet where the element i contains the sum of the packet of \a vec[i] */ +template<typename Packet> EIGEN_DEVICE_FUNC inline Packet +preduxp(const Packet* vecs) { return vecs[0]; } + +/** \internal \returns the sum of the elements of \a a*/ +template<typename Packet> EIGEN_DEVICE_FUNC inline typename unpacket_traits<Packet>::type predux(const Packet& a) +{ return a; } + +/** \internal \returns the sum of the elements of \a a by block of 4 elements. + * For a packet {a0, a1, a2, a3, a4, a5, a6, a7}, it returns a half packet {a0+a4, a1+a5, a2+a6, a3+a7} + * For packet-size smaller or equal to 4, this boils down to a noop. + */ +template<typename Packet> EIGEN_DEVICE_FUNC inline +typename conditional<(unpacket_traits<Packet>::size%8)==0,typename unpacket_traits<Packet>::half,Packet>::type +predux_downto4(const Packet& a) +{ return a; } + +/** \internal \returns the product of the elements of \a a*/ +template<typename Packet> EIGEN_DEVICE_FUNC inline typename unpacket_traits<Packet>::type predux_mul(const Packet& a) +{ return a; } + +/** \internal \returns the min of the elements of \a a*/ +template<typename Packet> EIGEN_DEVICE_FUNC inline typename unpacket_traits<Packet>::type predux_min(const Packet& a) +{ return a; } + +/** \internal \returns the max of the elements of \a a*/ +template<typename Packet> EIGEN_DEVICE_FUNC inline typename unpacket_traits<Packet>::type predux_max(const Packet& a) +{ return a; } + +/** \internal \returns the reversed elements of \a a*/ +template<typename Packet> EIGEN_DEVICE_FUNC inline Packet preverse(const Packet& a) +{ return a; } + +/** \internal \returns \a a with real and imaginary part flipped (for complex type only) */ +template<typename Packet> EIGEN_DEVICE_FUNC inline Packet pcplxflip(const Packet& a) +{ + // FIXME: uncomment the following in case we drop the internal imag and real functions. +// using std::imag; +// using std::real; + return Packet(imag(a),real(a)); +} + +/************************** +* Special math functions +***************************/ + +/** \internal \returns the sine of \a a (coeff-wise) */ +template<typename Packet> EIGEN_DECLARE_FUNCTION_ALLOWING_MULTIPLE_DEFINITIONS +Packet psin(const Packet& a) { using std::sin; return sin(a); } + +/** \internal \returns the cosine of \a a (coeff-wise) */ +template<typename Packet> EIGEN_DECLARE_FUNCTION_ALLOWING_MULTIPLE_DEFINITIONS +Packet pcos(const Packet& a) { using std::cos; return cos(a); } + +/** \internal \returns the tan of \a a (coeff-wise) */ +template<typename Packet> EIGEN_DECLARE_FUNCTION_ALLOWING_MULTIPLE_DEFINITIONS +Packet ptan(const Packet& a) { using std::tan; return tan(a); } + +/** \internal \returns the arc sine of \a a (coeff-wise) */ +template<typename Packet> EIGEN_DECLARE_FUNCTION_ALLOWING_MULTIPLE_DEFINITIONS +Packet pasin(const Packet& a) { using std::asin; return asin(a); } + +/** \internal \returns the arc cosine of \a a (coeff-wise) */ +template<typename Packet> EIGEN_DECLARE_FUNCTION_ALLOWING_MULTIPLE_DEFINITIONS +Packet pacos(const Packet& a) { using std::acos; return acos(a); } + +/** \internal \returns the arc tangent of \a a (coeff-wise) */ +template<typename Packet> EIGEN_DECLARE_FUNCTION_ALLOWING_MULTIPLE_DEFINITIONS +Packet patan(const Packet& a) { using std::atan; return atan(a); } + +/** \internal \returns the hyperbolic sine of \a a (coeff-wise) */ +template<typename Packet> EIGEN_DECLARE_FUNCTION_ALLOWING_MULTIPLE_DEFINITIONS +Packet psinh(const Packet& a) { using std::sinh; return sinh(a); } + +/** \internal \returns the hyperbolic cosine of \a a (coeff-wise) */ +template<typename Packet> EIGEN_DECLARE_FUNCTION_ALLOWING_MULTIPLE_DEFINITIONS +Packet pcosh(const Packet& a) { using std::cosh; return cosh(a); } + +/** \internal \returns the hyperbolic tan of \a a (coeff-wise) */ +template<typename Packet> EIGEN_DECLARE_FUNCTION_ALLOWING_MULTIPLE_DEFINITIONS +Packet ptanh(const Packet& a) { using std::tanh; return tanh(a); } + +/** \internal \returns the exp of \a a (coeff-wise) */ +template<typename Packet> EIGEN_DECLARE_FUNCTION_ALLOWING_MULTIPLE_DEFINITIONS +Packet pexp(const Packet& a) { using std::exp; return exp(a); } + +/** \internal \returns the log of \a a (coeff-wise) */ +template<typename Packet> EIGEN_DECLARE_FUNCTION_ALLOWING_MULTIPLE_DEFINITIONS +Packet plog(const Packet& a) { using std::log; return log(a); } + +/** \internal \returns the log1p of \a a (coeff-wise) */ +template<typename Packet> EIGEN_DECLARE_FUNCTION_ALLOWING_MULTIPLE_DEFINITIONS +Packet plog1p(const Packet& a) { return numext::log1p(a); } + +/** \internal \returns the log10 of \a a (coeff-wise) */ +template<typename Packet> EIGEN_DECLARE_FUNCTION_ALLOWING_MULTIPLE_DEFINITIONS +Packet plog10(const Packet& a) { using std::log10; return log10(a); } + +/** \internal \returns the square-root of \a a (coeff-wise) */ +template<typename Packet> EIGEN_DECLARE_FUNCTION_ALLOWING_MULTIPLE_DEFINITIONS +Packet psqrt(const Packet& a) { using std::sqrt; return sqrt(a); } + +/** \internal \returns the reciprocal square-root of \a a (coeff-wise) */ +template<typename Packet> EIGEN_DECLARE_FUNCTION_ALLOWING_MULTIPLE_DEFINITIONS +Packet prsqrt(const Packet& a) { + return pdiv(pset1<Packet>(1), psqrt(a)); +} + +/** \internal \returns the rounded value of \a a (coeff-wise) */ +template<typename Packet> EIGEN_DECLARE_FUNCTION_ALLOWING_MULTIPLE_DEFINITIONS +Packet pround(const Packet& a) { using numext::round; return round(a); } + +/** \internal \returns the floor of \a a (coeff-wise) */ +template<typename Packet> EIGEN_DECLARE_FUNCTION_ALLOWING_MULTIPLE_DEFINITIONS +Packet pfloor(const Packet& a) { using numext::floor; return floor(a); } + +/** \internal \returns the ceil of \a a (coeff-wise) */ +template<typename Packet> EIGEN_DECLARE_FUNCTION_ALLOWING_MULTIPLE_DEFINITIONS +Packet pceil(const Packet& a) { using numext::ceil; return ceil(a); } + +/*************************************************************************** +* The following functions might not have to be overwritten for vectorized types +***************************************************************************/ + +/** \internal copy a packet with constant coeficient \a a (e.g., [a,a,a,a]) to \a *to. \a to must be 16 bytes aligned */ +// NOTE: this function must really be templated on the packet type (think about different packet types for the same scalar type) +template<typename Packet> +inline void pstore1(typename unpacket_traits<Packet>::type* to, const typename unpacket_traits<Packet>::type& a) +{ + pstore(to, pset1<Packet>(a)); +} + +/** \internal \returns a * b + c (coeff-wise) */ +template<typename Packet> EIGEN_DEVICE_FUNC inline Packet +pmadd(const Packet& a, + const Packet& b, + const Packet& c) +{ return padd(pmul(a, b),c); } + +/** \internal \returns a packet version of \a *from. + * The pointer \a from must be aligned on a \a Alignment bytes boundary. */ +template<typename Packet, int Alignment> +EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE Packet ploadt(const typename unpacket_traits<Packet>::type* from) +{ + if(Alignment >= unpacket_traits<Packet>::alignment) + return pload<Packet>(from); + else + return ploadu<Packet>(from); +} + +/** \internal copy the packet \a from to \a *to. + * The pointer \a from must be aligned on a \a Alignment bytes boundary. */ +template<typename Scalar, typename Packet, int Alignment> +EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE void pstoret(Scalar* to, const Packet& from) +{ + if(Alignment >= unpacket_traits<Packet>::alignment) + pstore(to, from); + else + pstoreu(to, from); +} + +/** \internal \returns a packet version of \a *from. + * Unlike ploadt, ploadt_ro takes advantage of the read-only memory path on the + * hardware if available to speedup the loading of data that won't be modified + * by the current computation. + */ +template<typename Packet, int LoadMode> +EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE Packet ploadt_ro(const typename unpacket_traits<Packet>::type* from) +{ + return ploadt<Packet, LoadMode>(from); +} + +/** \internal default implementation of palign() allowing partial specialization */ +template<int Offset,typename PacketType> +struct palign_impl +{ + // by default data are aligned, so there is nothing to be done :) + static inline void run(PacketType&, const PacketType&) {} +}; + +/** \internal update \a first using the concatenation of the packet_size minus \a Offset last elements + * of \a first and \a Offset first elements of \a second. + * + * This function is currently only used to optimize matrix-vector products on unligned matrices. + * It takes 2 packets that represent a contiguous memory array, and returns a packet starting + * at the position \a Offset. For instance, for packets of 4 elements, we have: + * Input: + * - first = {f0,f1,f2,f3} + * - second = {s0,s1,s2,s3} + * Output: + * - if Offset==0 then {f0,f1,f2,f3} + * - if Offset==1 then {f1,f2,f3,s0} + * - if Offset==2 then {f2,f3,s0,s1} + * - if Offset==3 then {f3,s0,s1,s3} + */ +template<int Offset,typename PacketType> +inline void palign(PacketType& first, const PacketType& second) +{ + palign_impl<Offset,PacketType>::run(first,second); +} + +/*************************************************************************** +* Fast complex products (GCC generates a function call which is very slow) +***************************************************************************/ + +// Eigen+CUDA does not support complexes. +#ifndef __CUDACC__ + +template<> inline std::complex<float> pmul(const std::complex<float>& a, const std::complex<float>& b) +{ return std::complex<float>(real(a)*real(b) - imag(a)*imag(b), imag(a)*real(b) + real(a)*imag(b)); } + +template<> inline std::complex<double> pmul(const std::complex<double>& a, const std::complex<double>& b) +{ return std::complex<double>(real(a)*real(b) - imag(a)*imag(b), imag(a)*real(b) + real(a)*imag(b)); } + +#endif + + +/*************************************************************************** + * PacketBlock, that is a collection of N packets where the number of words + * in the packet is a multiple of N. +***************************************************************************/ +template <typename Packet,int N=unpacket_traits<Packet>::size> struct PacketBlock { + Packet packet[N]; +}; + +template<typename Packet> EIGEN_DEVICE_FUNC inline void +ptranspose(PacketBlock<Packet,1>& /*kernel*/) { + // Nothing to do in the scalar case, i.e. a 1x1 matrix. +} + +/*************************************************************************** + * Selector, i.e. vector of N boolean values used to select (i.e. blend) + * words from 2 packets. +***************************************************************************/ +template <size_t N> struct Selector { + bool select[N]; +}; + +template<typename Packet> EIGEN_DEVICE_FUNC inline Packet +pblend(const Selector<unpacket_traits<Packet>::size>& ifPacket, const Packet& thenPacket, const Packet& elsePacket) { + return ifPacket.select[0] ? thenPacket : elsePacket; +} + +/** \internal \returns \a a with the first coefficient replaced by the scalar b */ +template<typename Packet> EIGEN_DEVICE_FUNC inline Packet +pinsertfirst(const Packet& a, typename unpacket_traits<Packet>::type b) +{ + // Default implementation based on pblend. + // It must be specialized for higher performance. + Selector<unpacket_traits<Packet>::size> mask; + mask.select[0] = true; + // This for loop should be optimized away by the compiler. + for(Index i=1; i<unpacket_traits<Packet>::size; ++i) + mask.select[i] = false; + return pblend(mask, pset1<Packet>(b), a); +} + +/** \internal \returns \a a with the last coefficient replaced by the scalar b */ +template<typename Packet> EIGEN_DEVICE_FUNC inline Packet +pinsertlast(const Packet& a, typename unpacket_traits<Packet>::type b) +{ + // Default implementation based on pblend. + // It must be specialized for higher performance. + Selector<unpacket_traits<Packet>::size> mask; + // This for loop should be optimized away by the compiler. + for(Index i=0; i<unpacket_traits<Packet>::size-1; ++i) + mask.select[i] = false; + mask.select[unpacket_traits<Packet>::size-1] = true; + return pblend(mask, pset1<Packet>(b), a); +} + +} // end namespace internal + +} // end namespace Eigen + +#endif // EIGEN_GENERIC_PACKET_MATH_H |