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Merged
wsmoses merged 1 commit into from
May 21, 2026
+21 −0
Merged

Add sparam #3119

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4 changes: 4 additions & 0 deletions src/llvm/attributes.jl
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Original file line number Diff line number Diff line change
@@ -1,4 +1,6 @@
const nofreefns = Set{String}((
"jl_f__compute_sparams",
"ijl_f__compute_sparams",
"jl_genericmemory_copyto",
"jl_get_binding_value_seqcst",
"ijl_get_binding_value_seqcst",
Expand Down Expand Up @@ -215,6 +217,8 @@ const nofreefns = Set{String}((
))

const inactivefns = Set{String}((
"jl_f__compute_sparams",
"ijl_f__compute_sparams",

# The binding lookup is asserted as inactive [e.g. globals are considered constant wrt differentiation]
# If and when this changes, we need to change that here
Expand Down
17 changes: 17 additions & 0 deletions test/sparam.jl
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Original file line number Diff line number Diff line change
@@ -0,0 +1,17 @@
using Enzyme, Test

dual_type(c::NTuple{N, Float64}) where {N} = Val{N}

function loss(x::Vector{Float64})
t = ntuple(_ -> 0.0, length(x)) # NTuple{_A, Float64} where _A — non-inferable N
return sum(x) + (dual_type(t) === Val{2} ? 0.0 : 1.0)
end

@testset "broadcast" begin
res = Enzyme.gradient(
Enzyme.set_runtime_activity(Enzyme.Reverse),
Enzyme.Const(loss),
[1.0, 2.0]
)[1]
@test res ≈ [1.0, 1.0]
end
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