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Add missing colon rule #2641

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Merged
merged 1 commit into from
Oct 1, 2025
Merged

Add missing colon rule #2641

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48 changes: 47 additions & 1 deletion src/internal_rules.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -1380,7 +1380,7 @@ function EnzymeRules.augmented_primal(
start::Annotation{<:AbstractFloat},
step::Annotation{<:AbstractFloat},
stop::Annotation{<:AbstractFloat},
) where RT <: Active
) where RT <: Union{Active,Const}

if EnzymeRules.needs_primal(config)
primal = func.val(start.val, step.val, stop.val)
Expand All @@ -1394,6 +1394,52 @@ function EnzymeRules.augmented_primal(
}(primal, nothing, nothing)
end

function EnzymeRules.reverse(
config::EnzymeRules.RevConfig,
func::Const{Colon},
dret::Const,
tape::Nothing,
start::Annotation{T1},
step::Annotation{T2},
stop::Annotation{T3},
) where {T1<:AbstractFloat,T2<:AbstractFloat,T3<:AbstractFloat}
dstart = if start isa Const
nothing
elseif EnzymeRules.width(config) == 1
zero(T1)
else
ntuple(Val(EnzymeRules.width(config))) do i
Base.@_inline_meta
zero(T1)
end
end

dstep = if step isa Const
nothing
elseif EnzymeRules.width(config) == 1
zero(T2)
else
ntuple(Val(EnzymeRules.width(config))) do i
Base.@_inline_meta
zero(T2)
end
end

dstop = if stop isa Const
nothing
elseif EnzymeRules.width(config) == 1
zero(T3)
else
ntuple(Val(EnzymeRules.width(config))) do i
Base.@_inline_meta
zero(T3)
end
end

return (dstart, dstep, dstop)
end


function EnzymeRules.reverse(
config::EnzymeRules.RevConfig,
func::Const{Colon},
Expand Down
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