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Migrate to Enzyme easy_rule #29

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Merged
ChrisRackauckas merged 1 commit into from
Oct 28, 2025
Merged

Migrate to Enzyme easy_rule #29

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2 changes: 1 addition & 1 deletion Project.toml
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Original file line number Diff line number Diff line change
Expand Up @@ -24,7 +24,7 @@ FastPowerReverseDiffExt = "ReverseDiff"
FastPowerTrackerExt = "Tracker"

[compat]
Enzyme = "0.13"
Enzyme = "0.13.89"
ForwardDiff = "0.10, 1"
Measurements = "2"
MonteCarloMeasurements = "1"
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52 changes: 4 additions & 48 deletions ext/FastPowerEnzymeExt.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -5,53 +5,9 @@ import FastPower: fastpower
using Enzyme
using Enzyme.EnzymeRules: FwdConfig

function Enzyme.EnzymeRules.forward(config::FwdConfig,
func::Const{typeof(FastPower.fastpower)},
RT::Type{<:Union{Duplicated, DuplicatedNoNeed}},
_x::Union{Const, Duplicated}, _y::Union{Const, Duplicated})
x = _x.val
y = _y.val
ret = func.val(x, y)
T = typeof(ret)
if !(_x isa Const)
dxval = _x.dval * y * (fastpower(x, y - 1))
else
dxval = make_zero(_x.val)
end
if !(_y isa Const)
dyval = x isa Real && x<=0 ? Base.oftype(float(x), NaN) :
_y.dval*(fastpower(x, y))*log(x)
else
dyval = make_zero(_y.val)
end
if RT <: DuplicatedNoNeed
return convert(T, dxval + dyval)
else
return Duplicated(ret, convert(T, dxval + dyval))
end
end

function EnzymeRules.augmented_primal(config::Enzyme.EnzymeRules.RevConfigWidth{1},
func::Const{typeof(fastpower)}, ::Union{Type{<:Active}, Type{<:Const}},
x::Union{Const, Active}, y::Union{Const, Active})
if EnzymeRules.needs_primal(config)
primal = func.val(x.val, y.val)
else
primal = nothing
end
return EnzymeRules.AugmentedReturn(primal, nothing, nothing)
end

function EnzymeRules.reverse(config::Enzyme.EnzymeRules.RevConfigWidth{1},
func::Const{typeof(fastpower)}, dret, tape, _x::Union{Const, Active}, _y::Union{
Const, Active})
x = _x.val
y = _y.val
dxval = _x isa Const ? nothing : dret.val * y * (fastpower(x, y - 1))
dyval = _y isa Const ? nothing :
(x isa Real && x<=0 ? Base.oftype(float(x), NaN) :
dret.val * (fastpower(x, y)) * log(x))
return (dxval, dyval)
end
Enzyme.EnzymeRules.@easy_rule(
FastPower.fastpower(x, y),
( y * fastpower(x, y - 1), Ω * log(x) )
)

end
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