fixup! yank CPU backend

src/KernelAbstractions.jl

@@ -187,6 +187,8 @@ After releasing the memory of an array, it should no longer be accessed.
 """
 function unsafe_free! end
 
+unsafe_free!(::AbstractArray) = return
+
 ###
 # Kernel language
 # - @localmem

src/cpu.jl

@@ -1,4 +1,3 @@
-unsafe_free!(::AbstractArray) = return
 synchronize(::CPU) = nothing
 
 allocate(::CPU, ::Type{T}, dims::Tuple) where {T} = Array{T}(undef, dims)

src/pocl/backend.jl

@@ -18,25 +18,46 @@ export POCLBackend
 struct POCLBackend <: KA.GPU
 end
 
-# KA.allocate(::POCLBackend, ::Type{T}, dims::Tuple) where T = CLArray{T}(undef, dims)
-# KA.zeros(::POCLBackend, ::Type{T}, dims::Tuple) where T = OpenCL.zeros(T, dims)
-# KA.ones(::POCLBackend, ::Type{T}, dims::Tuple) where T = OpenCL.ones(T, dims)
 
-# KA.get_backend(::CLArray) = POCLBackend()
-# KA.synchronize(::POCLBackend) = cl.finish(cl.queue())
-# KA.supports_float64(::POCLBackend) = false  # XXX: this is platform/device dependent
-
-# Adapt.adapt_storage(::POCLBackend, a::Array) = Adapt.adapt(CLArray, a)
-# Adapt.adapt_storage(::POCLBackend, a::CLArray) = a
-# Adapt.adapt_storage(::KA.CPU, a::CLArray) = convert(Array, a)
+## Memory Operations
 
+KA.allocate(::POCLBackend, ::Type{T}, dims::Tuple) where {T} = Array{T}(undef, dims)
+
+function KA.zeros(backend::POCLBackend, ::Type{T}, dims::Tuple) where {T}
+    arr = allocate(backend, T, dims)
+    kernel = init_kernel(backend)
+    kernel(arr, zero, T, ndrange = length(arr))
+    return arr
+end
+function KA.ones(backend::POCLBackend, ::Type{T}, dims::Tuple) where {T}
+    arr = allocate(backend, T, dims)
+    kernel = init_kernel(backend)
+    kernel(arr, one, T; ndrange = length(arr))
+    return arr
+end
+
+function KA.copyto!(backend::POCLBackend, A, B)
+    if get_backend(A) == get_backend(B) && get_backend(A) isa POCLBackend
+        if length(A) != length(B)
+            error("Arrays must match in length")
+        end
+        if Base.mightalias(A, B)
+            error("Arrays may not alias")
+        end
+        kernel = copy_kernel(backend)
+        kernel(A, B, ndrange = length(A))
+        return A
+    else
+        return Base.copyto!(A, B)
+    end
+end
 
-## Memory Operations
+KA.functional(::POCLBackend) = true
+KA.pagelock!(::POCLBackend, x) = nothing
 
-# function KA.copyto!(::POCLBackend, A, B)
-#     copyto!(A, B)
-#     # TODO: Address device to host copies in jl being synchronizing
-# end
+KA.get_backend(::Array) = POCLBackend()
+KA.synchronize(::POCLBackend) = nothing 
+KA.supports_float64(::POCLBackend) = true
 
 
 ## Kernel Launch

src/pocl/pocl.jl

@@ -67,7 +67,6 @@ import .POCLKernels: POCLBackend
 export POCLBackend
 
 import KernelAbstractions as KA
-KA.get_backend(::Array) = POCLBackend()
 
 Adapt.adapt_storage(::POCLBackend, a::Array) = a