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use TypeArithmetic trait in cumsum! implementation #21666

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May 9, 2017
Merged

use TypeArithmetic trait in cumsum! implementation #21666

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use TypeArithmetic trait in cumsum! implementation
jw3126 May 1, 2017
a06b048
fix
jw3126 May 2, 2017
22a76c3
fix
jw3126 May 2, 2017
3465b4f
fix
jw3126 May 4, 2017
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15 changes: 10 additions & 5 deletions base/multidimensional.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -574,13 +574,18 @@ function accumulate_pairwise(op, v::AbstractVector{T}) where T
end

function cumsum!(out, v::AbstractVector, axis::Integer=1)
# for types prone to numerical stability issues, we want
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This comment seems worth preserving in some form?

# accumulate_pairwise.
axis == 1 ? accumulate_pairwise!(+, out, v) : copy!(out,v)
# we dispatch on the possibility of numerical stability issues
_cumsum!(out, v, axis, TypeArithmetic(eltype(out)))
end

function cumsum!(out, v::AbstractVector{<:Integer}, axis::Integer=1)
axis == 1 ? accumulate!(+, out, v) : copy!(out,v)
function _cumsum!(out, v, axis, ::ArithmeticRounds)
axis == 1 ? accumulate_pairwise!(+, out, v) : copy!(out, v)
end
function _cumsum(out, v, axis, ::ArithmeticUnknown)
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Missing !? If so, perhaps add a test covering this code path?

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Right, fixed!

_cumsum(out, v, axis, ArithmeticRounds())
end
function _cumsum!(out, v, axis, ::TypeArithmetic)
axis == 1 ? accumulate!(+, out, v) : copy!(out, v)
end

"""
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