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Add an extension for Enzyme #83

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22d079e
Add an extension for Enzyme
vchuravy Sep 4, 2025
c70f388
extend get_offsets
vchuravy Sep 4, 2025
a8b67ed
add Float64sr and Float16sr
vchuravy Sep 25, 2025
d37f509
fixup! add Float64sr and Float16sr
vchuravy Sep 25, 2025
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8 changes: 8 additions & 0 deletions Project.toml
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Original file line number Diff line number Diff line change
Expand Up @@ -9,16 +9,24 @@ DoubleFloats = "497a8b3b-efae-58df-a0af-a86822472b78"
Random = "9a3f8284-a2c9-5f02-9a11-845980a1fd5c"
RandomNumbers = "e6cf234a-135c-5ec9-84dd-332b85af5143"

[weakdeps]
Enzyme = "7da242da-08ed-463a-9acd-ee780be4f1d9"

[extensions]
EnzymeExt = "Enzyme"

[compat]
BFloat16s = "0.1, 0.2, 0.3, 0.4, 0.5"
DoubleFloats = "1"
Enzyme = "0.13"
Random = "1"
RandomNumbers = "^1.4"
julia = "1"

[extras]
DifferentialEquations = "0c46a032-eb83-5123-abaf-570d42b7fbaa"
Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
Enzyme = "7da242da-08ed-463a-9acd-ee780be4f1d9"

[targets]
test = ["Test", "DifferentialEquations"]
45 changes: 45 additions & 0 deletions ext/EnzymeExt.jl
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@@ -0,0 +1,45 @@
module EnzymeExt

using Enzyme
using StochasticRounding
import StochasticRounding: stochastic_round

function Enzyme.typetree_inner(::Type{Float64sr}, ctx, dl, seen::Enzyme.Compiler.TypeTreeTable)
return Enzyme.TypeTree(Enzyme.API.DT_Double, -1, ctx)
end

function Enzyme.get_offsets(::Type{Float64sr})
return ((Enzyme.API.DT_Double, 0),)
end

function Enzyme.typetree_inner(::Type{Float32sr}, ctx, dl, seen::Enzyme.Compiler.TypeTreeTable)
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@wsmoses wsmoses Sep 8, 2025

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so as is this can result in some errors, specifically if an all-zero bits is not a valid zero, or in reverse mode of a 32-bit floating point add is not a correct add.

return Enzyme.TypeTree(Enzyme.API.DT_Float, -1, ctx)
end

function Enzyme.get_offsets(::Type{Float32sr})
return ((Enzyme.API.DT_Float, 0),)
end

function Enzyme.typetree_inner(::Type{Float16sr}, ctx, dl, seen::Enzyme.Compiler.TypeTreeTable)
return Enzyme.TypeTree(Enzyme.API.DT_Half, -1, ctx)
end

function Enzyme.get_offsets(::Type{Float16sr})
return ((Enzyme.API.DT_Half, 0),)
end

import Enzyme: EnzymeRules
import Enzyme: Const, Duplicated

function EnzymeRules.forward(config, ::Const{typeof(stochastic_round)}, ::Type{<:DuplicatedNoNeed}, ::Const{Type{T}}, x::Duplicated) where T
stochastic_round(T, x.dval)
end

function EnzymeRules.forward(config, ::Const{typeof(stochastic_round)}, ::Type{<:Duplicated}, ::Const{Type{T}}, x::Duplicated) where T
Duplicated(
stochastic_round(T, x.val),
stochastic_round(T, x.dval)
)
end

end # module