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Replace StaticArrays with a simple immutable array type (re-land #83)
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# a simple immutable array type backed by stack memory | ||
# | ||
# similar to StaticArrays, but immutable to prevent optimization bugs (JuliaLang/julia#41800) | ||
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struct LocalArray{S <: Tuple, T, N, L} <: AbstractArray{T,N} | ||
data::NTuple{L,T} | ||
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LocalArray{S,T,N,L}(::UndefInitializer) where {S,T,N,L} = new{S,T,N,L}() | ||
LocalArray{S,T,N,L}(data::NTuple{L,T}) where {S,T,N,L} = new{S,T,N,L}(data) | ||
end | ||
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@inline @generated function LocalArray{S,T}(args...) where {S,T} | ||
dims = (S.parameters...,) | ||
N = length(dims) | ||
L = prod(dims) | ||
@assert isbitstype(T) | ||
quote | ||
LocalArray{S, T, $N, $L}(args...) | ||
end | ||
end | ||
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# array interface | ||
Base.IndexStyle(::Type{<:LocalArray}) = IndexLinear() | ||
Base.size(x::LocalArray{S}) where {S} = (S.parameters...,) | ||
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# indexing | ||
Base.@propagate_inbounds function Base.getindex(v::LocalArray, i::Int) | ||
@boundscheck checkbounds(v,i) | ||
@inbounds v.data[i] | ||
end | ||
Base.@propagate_inbounds function Base.setindex(v::LocalArray{S,T,N,L} , val, i::Int) where {S,T,N,L} | ||
@boundscheck checkbounds(v,i) | ||
new_data = Base.setindex(v.data, val, i) | ||
LocalArray{S,T,N,L}(new_data) | ||
end | ||
## XXX: Base's setindex doesn't have a ND version | ||
Base.@propagate_inbounds function Base.setindex(v::LocalArray{S,T,N,L} , val, is::Int...) where {S,T,N,L} | ||
@boundscheck checkbounds(v,is...) | ||
I = CartesianIndex(is...) | ||
i = LinearIndices(v)[I] | ||
new_data = Base.setindex(v.data, val, i) | ||
LocalArray{S,T,N,L}(new_data) | ||
end |
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