Add Fastor library
This commit is contained in:
Bassem Girgis
210
noarch/include/Fastor/tensor/Ranges.h
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210
noarch/include/Fastor/tensor/Ranges.h
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#ifndef RANGES_H
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#define RANGES_H
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#include "Fastor/config/config.h"
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#include "Fastor/meta/meta.h"
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#include <initializer_list>
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namespace Fastor {
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// range detector for fseq
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//----------------------------------------------------------------------------------------------------------//
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template<int first, int last, int step>
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struct range_detector {
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static constexpr int range = last - first;
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static constexpr int value = range % step==0 ? range/step : range/step+1;
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};
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namespace internal {
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template<class Seq>
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struct fseq_range_detector;
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template<template<int,int,int> class Seq, int first, int last, int step>
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struct fseq_range_detector<Seq<first,last,step>> {
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static constexpr int range = last - first;
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static constexpr int value = range % step==0 ? range/step : range/step+1;
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};
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} // internal
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//----------------------------------------------------------------------------------------------------------//
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// Immediate sequence
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//----------------------------------------------------------------------------------------------------------//
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template<size_t F, size_t L, size_t S=1>
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struct iseq {
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static constexpr size_t _first = F;
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static constexpr size_t _last= L;
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static constexpr size_t _step = S;
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};
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//----------------------------------------------------------------------------------------------------------//
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// Fixed sequence
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//----------------------------------------------------------------------------------------------------------//
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template<int F, int L, int S=1>
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struct fseq {
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static constexpr int _first = F;
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static constexpr int _last= L;
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static constexpr int _step = S;
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static constexpr int Size = range_detector<F,L,S>::value;
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constexpr FASTOR_INLINE int size() const {return range_detector<F,L,S>::value;}
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};
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static constexpr fseq<0,-1,1> fall;
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template<int F>
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static constexpr fseq<F,F+1,1> fix{};
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static constexpr fseq<0 ,1 ,1> ffirst;
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static constexpr fseq<-1,-1,1> flast;
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//----------------------------------------------------------------------------------------------------------//
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// Dynamic sequence
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//----------------------------------------------------------------------------------------------------------//
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struct seq {
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int _first;
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int _last;
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int _step = 1;
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constexpr FASTOR_INLINE seq(int _f, int _l, int _s=1) : _first(_f), _last(_l), _step(_s) {}
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constexpr FASTOR_INLINE seq(int num) : _first(num), _last(num+1), _step(1) {}
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template<int F, int L, int S=1>
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constexpr FASTOR_INLINE seq(fseq<F,L,S>) : _first(F), _last(L), _step(S) {}
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// Do not allow construction of seq using std::initializer_list, as it happens
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// implicitly. Overloading operator() with std::initializer_list should imply
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// TensorRandomView, not TensorView
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template<typename T>
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constexpr FASTOR_INLINE seq(std::initializer_list<T> _s1) = delete;
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// Do not provide this overload as it is meaningless [iseq stands for immediate evaluation]
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// template<size_t F, size_t L, size_t S=1>
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// constexpr FASTOR_INLINE seq(iseq<F,L,S>) : _first(F), _last(L), _step(S) {}
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FASTOR_INLINE int size() const {
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int range = _last - _first;
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return range % _step==0 ? range/_step : range/_step+1;
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}
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constexpr FASTOR_INLINE bool operator==(seq other) const {
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return (_first==other._first && _last==other._last && _step==other._step) ? true : false;
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}
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constexpr FASTOR_INLINE bool operator!=(seq other) const {
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return (_first!=other._first || _last!=other._last || _step!=other._step) ? true : false;
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}
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};
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static constexpr int first = 0;
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static constexpr int last = -1;
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// static constexpr seq all = seq(0,-1,1);
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// why not this?
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static constexpr fseq<0,-1,1> all;
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//----------------------------------------------------------------------------------------------------------//
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// traits
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//----------------------------------------------------------------------------------------------------------//
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template<typename T>
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struct is_fixed_sequence {
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static constexpr bool value = false;
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};
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template<int F, int L, int S>
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struct is_fixed_sequence<fseq<F,L,S>> {
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static constexpr bool value = true;
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};
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template<int F, int L>
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struct is_fixed_sequence<fseq<F,L,1>> {
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static constexpr bool value = true;
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};
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template<typename T>
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static constexpr bool is_fixed_sequence_v = is_fixed_sequence<T>::value;
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template<typename ... T>
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struct is_fixed_sequence_pack;
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template<typename T, typename ... Ts>
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struct is_fixed_sequence_pack<T,Ts...> {
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static constexpr bool value = is_fixed_sequence<T>::value && is_fixed_sequence_pack<Ts...>::value;
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};
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template<typename T>
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struct is_fixed_sequence_pack<T> {
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static constexpr bool value = is_fixed_sequence<T>::value;
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};
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template<typename ... Ts>
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static constexpr bool is_fixed_sequence_pack_v = is_fixed_sequence_pack<Ts...>::value;
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//----------------------------------------------------------------------------------------------------------//
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// Transform sequence with negative indices to positive indices;
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//----------------------------------------------------------------------------------------------------------//
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template<class Seq, int N>
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struct to_positive;
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template<int F, int L, int S, int N>
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struct to_positive<fseq<F,L,S>,N> {
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// Same logic as seq used in the constructor of dynamic tensor views
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static constexpr int _first = (L==0 && F==-1) ? N-1 : ( L < 0 && F < 0 ? F + N + 1 : F);
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static constexpr int _last = (L < 0 && F >=0) ? L + N + 1 : ( (L==0 && F==-1) ? N : ( L < 0 && F < 0 ? L + N + 1 : L) );
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using type = fseq<_first,_last,S>;
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};
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template<int F, int L, int S, int N>
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struct to_positive<iseq<F,L,S>,N> {
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// Same logic as seq used in the constructor of dynamic tensor views
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static constexpr int _first = (L==0 && F==-1) ? N-1 : ( L < 0 && F < 0 ? F + N + 1 : F);
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static constexpr int _last = (L < 0 && F >=0) ? L + N + 1 : ( (L==0 && F==-1) ? N : ( L < 0 && F < 0 ? L + N + 1 : L) );
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using type = iseq<_first,_last,S>;
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};
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template<class Seq, int N>
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using to_positive_t = typename to_positive<Seq,N>::type;
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//----------------------------------------------------------------------------------------------------------//
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//----------------------------------------------------------------------------------------------------------//
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template<typename Derived, class Seq, typename ... Fseqs>
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struct get_fixed_sequence_pack_dimensions;
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template<template<typename,size_t...> class Derived, typename T, size_t ...Rest, size_t... ss, typename ... Fseqs>
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struct get_fixed_sequence_pack_dimensions<Derived<T, Rest...>, std_ext::index_sequence<ss...>, Fseqs...>{
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static constexpr std::array<int,sizeof...(Fseqs)> dims = { internal::fseq_range_detector<to_positive_t<Fseqs,Rest>>::value... };
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// using type = Derived<T,internal::fseq_range_detector<Fseqs>::value...>;
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using type = Derived<T,internal::fseq_range_detector<to_positive_t<Fseqs,Rest>>::value...>;
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static constexpr size_t Size = pack_prod<dims[ss]...>::value;
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};
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template<template<typename,size_t...> class Derived, typename T, size_t ...Rest, size_t... ss, typename ... Fseqs>
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constexpr std::array<int,sizeof...(Fseqs)> get_fixed_sequence_pack_dimensions<Derived<T, Rest...>, std_ext::index_sequence<ss...>, Fseqs...>::dims;
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//----------------------------------------------------------------------------------------------------------//
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//----------------------------------------------------------------------------------------------------------//
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template<size_t F0, size_t L0, size_t S0, size_t F1, size_t L1, size_t S1, size_t Ncol, class Y>
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struct ravel_2d_indices;
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template<size_t F0, size_t L0, size_t S0, size_t F1, size_t L1, size_t S1, size_t Ncol, size_t ... ss>
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struct ravel_2d_indices<F0,L0,S0,F1,L1,S1,Ncol,std_ext::index_sequence<ss...>> {
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static constexpr size_t size_1 = range_detector<F1,L1,S1>::value;
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static constexpr std::array<size_t,sizeof...(ss)> idx = {(S0*(ss/size_1)*Ncol + S1*(ss%size_1) + F0*Ncol + F1)...};
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};
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template<size_t F0, size_t L0, size_t S0, size_t F1, size_t L1, size_t S1, size_t Ncol, size_t ... ss>
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constexpr std::array<size_t,sizeof...(ss)>
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ravel_2d_indices<F0,L0,S0,F1,L1,S1,Ncol,std_ext::index_sequence<ss...>>::idx;
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//----------------------------------------------------------------------------------------------------------//
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}
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#endif // RANGES_H
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