multiplication fails with discontinuous view

[CarloLucibello]

Found the following problem with multiplication of a discontinuous view by a matrix

x = ones(Float32,2,2) |> MtlArray
y = ones(Float32,4,2) |> MtlArray
yv = view(y, 1:2, :)
x * yv

ERROR: Scalar indexing is disallowed.
Invocation of getindex resulted in scalar indexing of a GPU array.
This is typically caused by calling an iterating implementation of a method.
Such implementations *do not* execute on the GPU, but very slowly on the CPU,
and therefore should be avoided.

If you want to allow scalar iteration, use `allowscalar` or `@allowscalar`
to enable scalar iteration globally or for the operations in question.
Stacktrace:
  [1] error(s::String)
    @ Base ./error.jl:35
  [2] errorscalar(op::String)
    @ GPUArraysCore ~/.julia/packages/GPUArraysCore/GMsgk/src/GPUArraysCore.jl:155
  [3] _assertscalar(op::String, behavior::GPUArraysCore.ScalarIndexing)
    @ GPUArraysCore ~/.julia/packages/GPUArraysCore/GMsgk/src/GPUArraysCore.jl:128
  [4] assertscalar(op::String)
    @ GPUArraysCore ~/.julia/packages/GPUArraysCore/GMsgk/src/GPUArraysCore.jl:116
  [5] getindex
    @ ~/.julia/packages/GPUArrays/qt4ax/src/host/indexing.jl:50 [inlined]
  [6] scalar_getindex
    @ ~/.julia/packages/GPUArrays/qt4ax/src/host/indexing.jl:36 [inlined]
  [7] _getindex
    @ ~/.julia/packages/GPUArrays/qt4ax/src/host/indexing.jl:19 [inlined]
  [8] getindex
    @ ~/.julia/packages/GPUArrays/qt4ax/src/host/indexing.jl:17 [inlined]
  [9] matmul2x2!(C::MtlMatrix{…}, tA::Char, tB::Char, A::MtlMatrix{…}, B::SubArray{…}, _add::LinearAlgebra.MulAddMul{…})
    @ LinearAlgebra ~/.julia/juliaup/julia-1.11.0+0.aarch64.apple.darwin14/share/julia/stdlib/v1.11/LinearAlgebra/src/matmul.jl:943
 [10] gemm_wrapper!(C::MtlMatrix{…}, tA::Char, tB::Char, A::MtlMatrix{…}, B::SubArray{…}, _add::LinearAlgebra.MulAddMul{…})
    @ LinearAlgebra ~/.julia/juliaup/julia-1.11.0+0.aarch64.apple.darwin14/share/julia/stdlib/v1.11/LinearAlgebra/src/matmul.jl:644
 [11] generic_matmatmul!
    @ ~/.julia/juliaup/julia-1.11.0+0.aarch64.apple.darwin14/share/julia/stdlib/v1.11/LinearAlgebra/src/matmul.jl:381 [inlined]
 [12] _mul!
    @ ~/.julia/juliaup/julia-1.11.0+0.aarch64.apple.darwin14/share/julia/stdlib/v1.11/LinearAlgebra/src/matmul.jl:287 [inlined]
 [13] mul!
    @ ~/.julia/juliaup/julia-1.11.0+0.aarch64.apple.darwin14/share/julia/stdlib/v1.11/LinearAlgebra/src/matmul.jl:285 [inlined]
 [14] mul!
    @ ~/.julia/juliaup/julia-1.11.0+0.aarch64.apple.darwin14/share/julia/stdlib/v1.11/LinearAlgebra/src/matmul.jl:253 [inlined]
 [15] *(A::MtlMatrix{Float32, Metal.PrivateStorage}, B::SubArray{Float32, 2, MtlMatrix{…}, Tuple{…}, false})
    @ LinearAlgebra ~/.julia/juliaup/julia-1.11.0+0.aarch64.apple.darwin14/share/julia/stdlib/v1.11/LinearAlgebra/src/matmul.jl:124
 [16] top-level scope
    @ ~/.julia/dev/Flux/prova.jl:24
Some type information was truncated. Use `show(err)` to see complete types.

julia> Metal.versioninfo()
macOS 14.6.1, Darwin 23.6.0

Toolchain:
- Julia: 1.11.0
- LLVM: 16.0.6

Julia packages: 
- Metal.jl: 1.4.1
- GPUArrays: 10.3.1
- GPUCompiler: 0.27.8
- KernelAbstractions: 0.9.28
- ObjectiveC: 3.1.0
- LLVM: 9.1.2
- LLVMDowngrader_jll: 0.3.0+1

1 device:
- Apple M1 Pro (640.000 KiB allocated)

[jonas4climate]

I'm new here but I believe this is something that cannot be adressed (i.e. remains unsupported as the error message indicates), until GPUArrays.jl provides functionality for such operations.