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

[maleadt]

Rebased and updated the JLL. On 7.0 the printf failure has disappeared, but another issue (which I didn't reduce yet) remains:

Call parameter type does not match function signature!
  %192 = call i32 @llvm.spv.track.constant.i32.i32(i32 undef, metadata i32 undef)
 ptr  %194 = call i32 (i32, ptr, ...) @llvm.spv.insertv.p0(i32 %191, i32 %192, i32 %193)
in function julia_ArgumentError_91762

[codecov]

Codecov Report

Attention: Patch coverage is 20.00000% with 4 lines in your changes missing coverage. Please review.

Project coverage is 32.51%. Comparing base (4103739) to head (fdc1656).

Files with missing lines	Patch %	Lines
src/array.jl	0.00%	2 Missing ⚠️
src/compiler/compilation.jl	0.00%	1 Missing ⚠️
src/compiler/execution.jl	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #285       +/-   ##
===========================================
- Coverage   73.82%   32.51%   -41.31%     
===========================================
  Files          12       11        -1     
  Lines         615      572       -43     
===========================================
- Hits          454      186      -268     
- Misses        161      386      +225     

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