Switch to the LLVM SPIR-V back-end.

[maleadt]

Same as JuliaGPU/oneAPI.jl#491, but I figured it's easier to do the experimentation here as the SPIRVIntrinsics submodule is part of this repository.

[maleadt]

Currently blocked on pocl/pocl#1799.

MWE:

function double_print_kernel()
    OpenCL.@print "foo"
    OpenCL.@print "barbar"
    return
end

function main()
    @opencl double_print_kernel()
end

Reduced from:

function orig()
    x = CLArray(zeros(Float32, (1, 1)))
    y = CLArray(rand(Float32, (1)))
    x[:, 1] = y
end

EDIT: upstream argued that this is an LLVM bug.

[maleadt]

Also blocked on llvm/llvm-project#127977

MWE: CLArray{Float32}(undef, 5, 5) + 1f0 * I

Reduced from:

function orig()
    T1 = T2 = Float32
    AT = CLArray
    f = identity
    x = ones(T1, 5, 5)
    y = AT(x)

    xw = f(x)
    yw = f(y)

    J = one(T2) * I

    @allowscalar collect(xw + J) ≈ collect(yw + J)
end