Remove special-casing of Ref in broadcast. (#510)

src/host/broadcast.jl

@@ -4,15 +4,6 @@ using Base.Broadcast
 
 import Base.Broadcast: BroadcastStyle, Broadcasted, AbstractArrayStyle, instantiate
 
-const BroadcastGPUArray{T} = Union{AnyGPUArray{T},
-                                   Base.RefValue{<:AbstractGPUArray{T}}}
-
-# Ref is special: it's not a real wrapper, so not part of Adapt,
-# but it is commonly used to bypass broadcasting of an argument
-# so we need to preserve its dimensionless properties.
-BroadcastStyle(::Type{Base.RefValue{AT}}) where {AT<:AbstractGPUArray} =
-    typeof(BroadcastStyle(AT))(Val(0))
-backend(::Type{Base.RefValue{AT}}) where {AT<:AbstractGPUArray} = backend(AT)
 # but make sure we don't dispatch to the optimized copy method that directly indexes
 function Broadcast.copy(bc::Broadcasted{<:AbstractGPUArrayStyle{0}})
     ElType = Broadcast.combine_eltypes(bc.f, bc.args)
@@ -41,7 +32,7 @@ end
     return _copyto!(dest, instantiate(Broadcasted{Style}(bc.f, bc.args, axes(dest))))
 end
 
-@inline Base.copyto!(dest::BroadcastGPUArray, bc::Broadcasted{Nothing}) = _copyto!(dest, bc) # Keep it for ArrayConflict
+@inline Base.copyto!(dest::AnyGPUArray, bc::Broadcasted{Nothing}) = _copyto!(dest, bc) # Keep it for ArrayConflict
 
 @inline Base.copyto!(dest::AbstractArray, bc::Broadcasted{<:AbstractGPUArrayStyle}) = _copyto!(dest, bc)
 
@@ -77,7 +68,7 @@ end
 allequal(x) = true
 allequal(x, y, z...) = x == y && allequal(y, z...)
 
-function Base.map(f, x::BroadcastGPUArray, xs::AbstractArray...)
+function Base.map(f, x::AnyGPUArray, xs::AbstractArray...)
     # if argument sizes match, their shape needs to be preserved
     xs = (x, xs...)
     if allequal(size.(xs)...)
@@ -96,7 +87,7 @@ function Base.map(f, x::BroadcastGPUArray, xs::AbstractArray...)
     return map!(f, dest, xs...)
 end
 
-function Base.map!(f, dest::BroadcastGPUArray, xs::AbstractArray...)
+function Base.map!(f, dest::AnyGPUArray, xs::AbstractArray...)
     # custom broadcast, ignoring the container size mismatches
     # (avoids the reshape + view that our mapreduce impl has to do)
     indices = LinearIndices.((dest, xs...))

test/testsuite/broadcasting.jl

@@ -156,21 +156,6 @@ function broadcasting(AT, eltypes)
                 map(+, x, y)
             end
         end
-
-        @testset "Ref" begin
-            # as first arg, 0d broadcast
-            @test compare(x->getindex.(Ref(x), 1), AT, ET[0])
-
-            void_setindex!(args...) = (setindex!(args...); return)
-            @test compare(x->(void_setindex!.(Ref(x), ET(1)); x), AT, ET[0])
-
-            # regular broadcast
-            a = AT(rand(ET, 10))
-            b = AT(rand(ET, 10))
-            cpy(i,a,b) = (a[i] = b[i]; return)
-            cpy.(1:10, Ref(a), Ref(b))
-            @test Array(a) == Array(b)
-        end
     end
 
     @testset "stackoverflow in copy(::Broadcast)" begin