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Detect alignment issues and throw a Julia error. #134

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Jul 6, 2023
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Detect alignment issues and throw a Julia error. #134

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16 changes: 16 additions & 0 deletions src/layout.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -19,11 +19,26 @@ using Base.Cartesian: @ntuple

struct Vec{N, T} end

@noinline function throw_alignmenterror(ptr)
@cuprintln "ERROR: AlignmentError: Pointer $ptr is not properly aligned for vectorized load/store"
error()
end

@inline function checkalignment(ptr)
checkalignment(Bool, ptr) || throw_alignmenterror(ptr)
nothing
end

@inline function checkalignment(::Type{Bool}, ptr)
Int(ptr) % 16 == 0
end

@inline @generated function vloada(::Type{Vec{N, T}}, ptr::Core.LLVMPtr{T, AS}) where {N, T, AS}
alignment = sizeof(T) * N

return quote
vec_ptr = Base.bitcast(Core.LLVMPtr{NTuple{N, VecElement{T}}, AS}, ptr)
@boundscheck checkalignment(vec_ptr)
return unsafe_load(vec_ptr, 1, Val($alignment))
end
end
Expand All @@ -40,6 +55,7 @@ end
append!(ex.args, (quote
y = @ntuple $N j -> VecElement{T}(x[j+$offset].value)
vec_ptr = Base.bitcast(Core.LLVMPtr{NTuple{N, VecElement{T}}, AS}, ptr)
@boundscheck checkalignment(vec_ptr)
unsafe_store!(vec_ptr, y, $offset ÷ N + 1, Val($alignment))
end).args)
end
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