Add some inline annotations for performance

Author: timholy

src/Interpolations.jl

@@ -246,7 +246,7 @@ end
 # interp_getindex1(A, indexes::Tuple{}, weights::Tuple{}, rest, I::Vararg{Int,M}) where M =
 #     error("exhausted the weights and indexes, this should never happen")
 
-interp_getindex(A::AbstractArray{T,N}, J::Tuple{Int,Vararg{Any,K}}, I::Vararg{Int,N}) where {T,N,K} =
+@inline interp_getindex(A::AbstractArray{T,N}, J::Tuple{Int,Vararg{Any,K}}, I::Vararg{Int,N}) where {T,N,K} =
     interp_getindex(A, Base.tail(J), Base.tail(I)..., J[1])
 @generated function interp_getindex(A::AbstractArray{T,N}, J::Tuple{WeightedAdjIndex{L,W},Vararg{Any,K}}, I::Vararg{Int,N}) where {T,N,K,L,W}
     ex = :(w[1]*interp_getindex(A, Jtail, Itail..., j))
@@ -274,7 +274,7 @@ end
         $ex
     end
 end
-interp_getindex(A::AbstractArray{T,N}, ::Tuple{}, I::Vararg{Int,N}) where {T,N} =   # termination
+@inline interp_getindex(A::AbstractArray{T,N}, ::Tuple{}, I::Vararg{Int,N}) where {T,N} =   # termination
     @inbounds A[I...]  # all bounds-checks have already happened
 
 """

src/b-splines/indexing.jl

@@ -59,7 +59,7 @@ end
 end
 
 
-function weightedindexes(fs::F, itpflags::NTuple{N,Flag}, knots::NTuple{N,AbstractVector}, xs::NTuple{N,Number}) where {F,N}
+@inline function weightedindexes(fs::F, itpflags::NTuple{N,Flag}, knots::NTuple{N,AbstractVector}, xs::NTuple{N,Number}) where {F,N}
     parts = map((flag, knotvec, x)->weightedindex_parts(fs, flag, knotvec, x), itpflags, knots, xs)
     weightedindexes(parts...)
 end
@@ -68,7 +68,7 @@ weightedindexes(i::Vararg{Int,N}) where N = i  # the all-NoInterp case
 
 const PositionCoefs{P,C} = NamedTuple{(:position,:coefs),Tuple{P,C}}
 const ValueParts{P,W} = PositionCoefs{P,Tuple{W}}
-weightedindexes(parts::Vararg{Union{Int,ValueParts},N}) where N = maybe_weightedindex.(positions.(parts), valuecoefs.(parts))
+@inline weightedindexes(parts::Vararg{Union{Int,ValueParts},N}) where N = maybe_weightedindex.(positions.(parts), valuecoefs.(parts))
 maybe_weightedindex(i::Integer, _::Integer) = Int(i)
 maybe_weightedindex(pos, coefs::Tuple) = WeightedIndex(pos, coefs)