Fix global linear indexing (fill!) (#496)

Author: christiangnrd

src/MetalKernels.jl

@@ -140,7 +140,9 @@ end
 end
 
 @device_override @inline function KA.__index_Global_Linear(ctx)
-    return thread_position_in_grid_1d()
+    I =  @inbounds KA.expand(KA.__iterspace(ctx), threadgroup_position_in_grid_1d(), thread_position_in_threadgroup_1d())
+    # TODO: This is unfortunate, can we get the linear index cheaper
+    @inbounds LinearIndices(KA.__ndrange(ctx))[I]
 end
 
 @device_override @inline function KA.__index_Local_Cartesian(ctx)

test/array.jl

@@ -229,15 +229,12 @@ end
 
 @testset "fill($T)" for T in [Int8, UInt8, Int16, UInt16, Int32, UInt32, Int64, UInt64,
                               Float16, Float32]
-    broken466a = T ∉ [Int8,UInt8]
-    broken466b = (Base.JLOptions().check_bounds != 1 || shader_validation)
-
     b = rand(T)
 
     # Dims in tuple
     let A = Metal.fill(b, (10, 10, 10, 1000))
         B = fill(b, (10, 10, 10, 1000))
-        @test Array(A) == B broken=(broken466a && broken466b)
+        @test Array(A) == B
     end
 
     let M = Metal.fill(b, (10, 10))
@@ -253,7 +250,7 @@ end
     #Dims already unpacked
     let A = Metal.fill(b, 10, 1000, 1000)
         B = fill(b, 10, 1000, 1000)
-        @test Array(A) == B broken=broken466a
+        @test Array(A) == B
     end
 
     let M = Metal.fill(b, 10, 10)
@@ -269,15 +266,12 @@ end
 
 @testset "fill!($T)" for T in [Int8, UInt8, Int16, UInt16, Int32, UInt32, Int64, UInt64,
                                Float16, Float32]
-    broken466a = T ∉ [Int8,UInt8]
-    broken466b = (Base.JLOptions().check_bounds != 1 || shader_validation)
-
     b = rand(T)
 
     # Dims in tuple
     let A = MtlArray{T,3}(undef, (10, 1000, 1000))
         fill!(A, b)
-        @test all(Array(A) .== b) broken=broken466a
+        @test all(Array(A) .== b)
     end
 
     let M = MtlMatrix{T}(undef, (10, 10))
@@ -293,7 +287,7 @@ end
     # Dims already unpacked
     let A = MtlArray{T,4}(undef, 10, 10, 10, 1000)
         fill!(A, b)
-        @test all(Array(A) .== b) broken=(broken466a && broken466b)
+        @test all(Array(A) .== b)
     end
 
     let M = MtlMatrix{T}(undef, 10, 10)