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annotate stencil.jl @ 131:8569c637d923 cell_based_test

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Enable compiler loop-unrolling in apply_backwards
author Vidar Stiernström <vidar.stiernstrom@it.uu.se>
date Thu, 21 Feb 2019 14:11:08 +0100
parents 1aaeb46ba5f4
children 6b6d921e8f05
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48079bd39969 Change to using tuples in stencils and ops
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1 struct Stencil{T<:Real,N}
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2 range::Tuple{Int,Int}
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3 weights::NTuple{N,T}
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4 end
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5
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6 function flip(s::Stencil)
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7 range = (-s.range[2], -s.range[1])
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8 return Stencil(range, reverse(s.weights))
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9 end
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11 # Provides index into the Stencil based on offset for the root element
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12 @inline function Base.getindex(s::Stencil, i::Int)
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18d0d794d3bb Make stencils respond to @ inbounds
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13 @boundscheck if i < s.range[1] || s.range[2] < i
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14 return eltype(s.weights)(0)
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15 end
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16 return s.weights[1 + i - s.range[1]]
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17 end
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19 Base.@propagate_inbounds @inline function apply(s::Stencil{T,N}, v::AbstractVector, i::Int) where {T,N}
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20 w = s.weights[1]*v[i + s.range[1]]
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21 @simd for k ∈ 2:N
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22 w += s.weights[k]*v[i + s.range[1] + k-1]
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23 end
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24 return w
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25 end
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27 Base.@propagate_inbounds @inline function apply_backwards(s::Stencil{T,N}, v::AbstractVector, i::Int) where {T,N}
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28 w = s.weights[N]*v[i - s.range[2]]
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29 @simd for k ∈ N-1:-1:1
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30 w += s.weights[k]*v[i - s.range[1] - k + 1]
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31 end
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32 return w
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33 end