Add AllocationsTest.jl

Project.toml

@@ -28,7 +28,8 @@ DiffTests = "de460e47-3fe3-5279-bb4a-814414816d5d"
 InteractiveUtils = "b77e0a4c-d291-57a0-90e8-8db25a27a240"
 LinearAlgebra = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"
 SparseArrays = "2f01184e-e22b-5df5-ae63-d93ebab69eaf"
+BenchmarkTools = "6e4b80f9-dd63-53aa-95a3-0cdb28fa8baf"
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
 
 [targets]
-test = ["Calculus", "DiffTests", "LinearAlgebra", "SparseArrays", "Test", "InteractiveUtils"]
+test = ["Calculus", "DiffTests", "LinearAlgebra", "SparseArrays", "Test", "InteractiveUtils", "BenchmarkTools"]

src/apiutils.jl

@@ -79,6 +79,6 @@ function seed!(duals::AbstractArray{Dual{T,V,N}}, x, index,
     offset = index - 1
     seed_inds = 1:chunksize
     dual_inds = seed_inds .+ offset
-    duals[dual_inds] .= Dual{T,V,N}.(view(x, dual_inds), seeds[seed_inds])
+    duals[dual_inds] .= Dual{T,V,N}.(view(x, dual_inds), getindex.(Ref(seeds), seed_inds))
     return duals
 end

test/AllocationsTest.jl

@@ -0,0 +1,27 @@
+module AllocationsTest
+
+using ForwardDiff
+using BenchmarkTools
+
+include(joinpath(dirname(@__FILE__), "utils.jl"))
+
+@testset "Test seed! allocations" begin
+    x = rand(1000)
+    cfg = ForwardDiff.GradientConfig(nothing, x)
+
+    balloc = @ballocated ForwardDiff.seed!($(cfg.duals), $x, $(cfg.seeds))
+    @test balloc == 0
+
+    balloc = @ballocated ForwardDiff.seed!($(cfg.duals), $x, $(cfg.seeds[1]))
+    @test balloc == 0
+
+    index = 1
+    balloc = @ballocated ForwardDiff.seed!($(cfg.duals), $x, $index, $(cfg.seeds))
+    @test balloc == 0
+
+    index = 1
+    balloc = @ballocated ForwardDiff.seed!($(cfg.duals), $x, $index, $(cfg.seeds[1]))
+    @test balloc == 0
+end
+
+end

test/runtests.jl

@@ -31,3 +31,7 @@ println("done (took $t seconds).")
 println("Testing miscellaneous functionality...")
 t = @elapsed include("MiscTest.jl")
 println("done (took $t seconds).")
+
+println("Testing allocations...")
+t = @elapsed include("AllocationsTest.jl")
+println("done (took $t seconds).")