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Constructors on GPU?#309
@bhawkins

Description

@bhawkins
bhawkins
opened on Jan 22, 2025

I'm implementing an algorithm on GPU where Float32 isn't accurate enough but Float64 incurs a 64x runtime penalty I'd like to avoid. The Fixed type is appealing because I can get the accuracy I need with a 32-bit type, and I have good prior knowledge of the dynamic range. I thought I'd give it a try but immediately ran into problems. For example,

using CUDA
using FixedPointNumbers

x_cpu = Float32[1, 2 ,3]
x_gpu = cu(x_cpu)

T = Q24f7
T.(x_cpu)  # no problem
T.(x_gpu)  # fails
log output 
warning: linking module flags 'Dwarf Version': IDs have conflicting values ('i32 4' from globals with 'i32 2' from start)
ERROR: LoadError: InvalidIRError: compiling MethodInstance for (::GPUArrays.var"#34#36")(::CUDA.CuKernelContext, ::CuDeviceVector{Q24f7, 1}, ::Base.Broadcast.Broadcasted{CUDA.CuArrayStyle{1, CUDA.DeviceMemory}, Tuple{Base.OneTo{Int64}}, CUDA.var"#1155#1156"{Q24f7}, Tuple{Base.Broadcast.Extruded{CuDeviceVector{Float32, 1}, Tuple{Bool}, Tuple{Int64}}}}, ::Int64) resulted in invalid LLVM IR
Reason: unsupported call to an external C function (call to jl_string_to_genericmemory)
Reason: unsupported call to an external C function (call to jl_genericmemory_to_string)
Reason: unsupported call to an external C function (call to ijl_pchar_to_string)
Reason: unsupported dynamic function invocation (call to !=)
Stacktrace:
 [1] show
   @ ./ryu/Ryu.jl:115
 [2] multiple call sites
   @ unknown:0
Reason: unsupported dynamic function invocation (call to writeshortest)
Stacktrace:
 [1] show
   @ ./ryu/Ryu.jl:116
 [2] multiple call sites
   @ unknown:0
Reason: unsupported call to an external C function (call to ijl_alloc_string)
Stacktrace:
 [1] _string_n
   @ ./strings/string.jl:109
 [2] StringMemory
   @ ./iobuffer.jl:44
 [3] StringVector
   @ ./iobuffer.jl:45
 [4] show
   @ ./ryu/Ryu.jl:114
 [5] multiple call sites
   @ unknown:0
Reason: unsupported call to a lazy-initialized function (call to jl_string_to_genericmemory)
Stacktrace:
 [1] unsafe_wrap
   @ ./strings/string.jl:119
 [2] StringMemory
   @ ./iobuffer.jl:44
 [3] StringVector
   @ ./iobuffer.jl:45
 [4] show
   @ ./ryu/Ryu.jl:114
 [5] multiple call sites
   @ unknown:0
Reason: unsupported dynamic function invocation (call to nonnothingtype)
Stacktrace:
 [1] nonnothing_nonmissing_typeinfo
   @ ./show.jl:1244
 [2] show
   @ ./ryu/Ryu.jl:115
 [3] multiple call sites
   @ unknown:0
Reason: unsupported dynamic function invocation (call to nonmissingtype)
Stacktrace:
 [1] nonnothing_nonmissing_typeinfo
   @ ./show.jl:1244
 [2] show
   @ ./ryu/Ryu.jl:115
 [3] multiple call sites
   @ unknown:0
Reason: unsupported call to an external C function (call to ijl_alloc_string)
Stacktrace:
 [1] _string_n
   @ ./strings/string.jl:109
 [2] StringMemory
   @ ./iobuffer.jl:44
 [3] StringVector
   @ ./iobuffer.jl:45
 [4] take!
   @ ./iobuffer.jl:467
 [5] multiple call sites
   @ unknown:0
Reason: unsupported call to a lazy-initialized function (call to jl_string_to_genericmemory)
Stacktrace:
 [1] unsafe_wrap
   @ ./strings/string.jl:119
 [2] StringMemory
   @ ./iobuffer.jl:44
 [3] StringVector
   @ ./iobuffer.jl:45
 [4] take!
   @ ./iobuffer.jl:467
 [5] multiple call sites
   @ unknown:0
Reason: unsupported call to an external C function (call to ijl_alloc_string)
Stacktrace:
 [1] _string_n
   @ ./strings/string.jl:109
 [2] StringMemory
   @ ./iobuffer.jl:44
 [3] StringVector
   @ ./iobuffer.jl:45
 [4] take!
   @ ./iobuffer.jl:471
 [5] multiple call sites
   @ unknown:0
Reason: unsupported call to a lazy-initialized function (call to jl_string_to_genericmemory)
Stacktrace:
 [1] unsafe_wrap
   @ ./strings/string.jl:119
 [2] StringMemory
   @ ./iobuffer.jl:44
 [3] StringVector
   @ ./iobuffer.jl:45
 [4] take!
   @ ./iobuffer.jl:471
 [5] multiple call sites
   @ unknown:0
Reason: unsupported call to an external C function (call to ijl_alloc_string)
Stacktrace:
 [1] _string_n
   @ ./strings/string.jl:109
 [2] StringMemory
   @ ./iobuffer.jl:44
 [3] StringVector
   @ ./iobuffer.jl:45
 [4] take!
   @ ./iobuffer.jl:476
 [5] multiple call sites
   @ unknown:0
Reason: unsupported call to a lazy-initialized function (call to jl_string_to_genericmemory)
Stacktrace:
 [1] unsafe_wrap
   @ ./strings/string.jl:119
 [2] StringMemory
   @ ./iobuffer.jl:44
 [3] StringVector
   @ ./iobuffer.jl:45
 [4] take!
   @ ./iobuffer.jl:476
 [5] multiple call sites
   @ unknown:0
Reason: unsupported dynamic function invocation (call to print_to_string(xs...) @ Base strings/io.jl:137)
Stacktrace:
 [1] string
   @ ./strings/io.jl:189
 [2] throw_converterror
   @ ~/.julia/packages/FixedPointNumbers/Dn4hv/src/FixedPointNumbers.jl:322
 [3] _convert
   @ ~/.julia/packages/FixedPointNumbers/Dn4hv/src/fixed.jl:81
 [4] FixedPoint
   @ ~/.julia/packages/FixedPointNumbers/Dn4hv/src/FixedPointNumbers.jl:58
 [5] #1155
   @ ~/.julia/packages/CUDA/2kjXI/src/compiler/execution.jl:186
 [6] _broadcast_getindex_evalf
   @ ./broadcast.jl:673
 [7] _broadcast_getindex
   @ ./broadcast.jl:646
 [8] getindex
   @ ./broadcast.jl:605
 [9] #34
   @ ~/.julia/packages/GPUArrays/qt4ax/src/host/broadcast.jl:59
Reason: unsupported call to a lazy-initialized function (call to jl_genericmemory_to_string)
Stacktrace:
 [1] String
   @ ./strings/string.jl:78
 [2] throw_converterror
   @ ~/.julia/packages/FixedPointNumbers/Dn4hv/src/FixedPointNumbers.jl:324
 [3] _convert
   @ ~/.julia/packages/FixedPointNumbers/Dn4hv/src/fixed.jl:81
 [4] FixedPoint
   @ ~/.julia/packages/FixedPointNumbers/Dn4hv/src/FixedPointNumbers.jl:58
 [5] #1155
   @ ~/.julia/packages/CUDA/2kjXI/src/compiler/execution.jl:186
 [6] _broadcast_getindex_evalf
   @ ./broadcast.jl:673
 [7] _broadcast_getindex
   @ ./broadcast.jl:646
 [8] getindex
   @ ./broadcast.jl:605
 [9] #34
   @ ~/.julia/packages/GPUArrays/qt4ax/src/host/broadcast.jl:59
Reason: unsupported call to a lazy-initialized function (call to ijl_pchar_to_string)
Stacktrace:
 [1] String
   @ ./strings/string.jl:80
 [2] throw_converterror
   @ ~/.julia/packages/FixedPointNumbers/Dn4hv/src/FixedPointNumbers.jl:324
 [3] _convert
   @ ~/.julia/packages/FixedPointNumbers/Dn4hv/src/fixed.jl:81
 [4] FixedPoint
   @ ~/.julia/packages/FixedPointNumbers/Dn4hv/src/FixedPointNumbers.jl:58
 [5] #1155
   @ ~/.julia/packages/CUDA/2kjXI/src/compiler/execution.jl:186
 [6] _broadcast_getindex_evalf
   @ ./broadcast.jl:673
 [7] _broadcast_getindex
   @ ./broadcast.jl:646
 [8] getindex
   @ ./broadcast.jl:605
 [9] #34
   @ ~/.julia/packages/GPUArrays/qt4ax/src/host/broadcast.jl:59
Reason: unsupported call to a lazy-initialized function (call to jl_genericmemory_to_string)
Stacktrace:
 [1] String
   @ ./strings/string.jl:78
 [2] throw_converterror
   @ ~/.julia/packages/FixedPointNumbers/Dn4hv/src/FixedPointNumbers.jl:325
 [3] _convert
   @ ~/.julia/packages/FixedPointNumbers/Dn4hv/src/fixed.jl:81
 [4] FixedPoint
   @ ~/.julia/packages/FixedPointNumbers/Dn4hv/src/FixedPointNumbers.jl:58
 [5] #1155
   @ ~/.julia/packages/CUDA/2kjXI/src/compiler/execution.jl:186
 [6] _broadcast_getindex_evalf
   @ ./broadcast.jl:673
 [7] _broadcast_getindex
   @ ./broadcast.jl:646
 [8] getindex
   @ ./broadcast.jl:605
 [9] #34
   @ ~/.julia/packages/GPUArrays/qt4ax/src/host/broadcast.jl:59
Reason: unsupported call to a lazy-initialized function (call to ijl_pchar_to_string)
Stacktrace:
 [1] String
   @ ./strings/string.jl:80
 [2] throw_converterror
   @ ~/.julia/packages/FixedPointNumbers/Dn4hv/src/FixedPointNumbers.jl:325
 [3] _convert
   @ ~/.julia/packages/FixedPointNumbers/Dn4hv/src/fixed.jl:81
 [4] FixedPoint
   @ ~/.julia/packages/FixedPointNumbers/Dn4hv/src/FixedPointNumbers.jl:58
 [5] #1155
   @ ~/.julia/packages/CUDA/2kjXI/src/compiler/execution.jl:186
 [6] _broadcast_getindex_evalf
   @ ./broadcast.jl:673
 [7] _broadcast_getindex
   @ ./broadcast.jl:646
 [8] getindex
   @ ./broadcast.jl:605
 [9] #34
   @ ~/.julia/packages/GPUArrays/qt4ax/src/host/broadcast.jl:59
Reason: unsupported dynamic function invocation (call to print_to_string(xs...) @ Base strings/io.jl:137)
Stacktrace:
 [1] string
   @ ./strings/io.jl:189
 [2] throw_converterror
   @ ~/.julia/packages/FixedPointNumbers/Dn4hv/src/FixedPointNumbers.jl:326
 [3] _convert
   @ ~/.julia/packages/FixedPointNumbers/Dn4hv/src/fixed.jl:81
 [4] FixedPoint
   @ ~/.julia/packages/FixedPointNumbers/Dn4hv/src/FixedPointNumbers.jl:58
 [5] #1155
   @ ~/.julia/packages/CUDA/2kjXI/src/compiler/execution.jl:186
 [6] _broadcast_getindex_evalf
   @ ./broadcast.jl:673
 [7] _broadcast_getindex
   @ ./broadcast.jl:646
 [8] getindex
   @ ./broadcast.jl:605
 [9] #34
   @ ~/.julia/packages/GPUArrays/qt4ax/src/host/broadcast.jl:59
Reason: unsupported call to an external C function (call to ijl_alloc_string)
Stacktrace:
  [1] _string_n
    @ ./strings/string.jl:109
  [2] StringMemory
    @ ./iobuffer.jl:44
  [3] #IOBuffer#519
    @ ./iobuffer.jl:128
  [4] GenericIOBuffer
    @ ./iobuffer.jl:119
  [5] throw_converterror
    @ ~/.julia/packages/FixedPointNumbers/Dn4hv/src/FixedPointNumbers.jl:323
  [6] _convert
    @ ~/.julia/packages/FixedPointNumbers/Dn4hv/src/fixed.jl:81
  [7] FixedPoint
    @ ~/.julia/packages/FixedPointNumbers/Dn4hv/src/FixedPointNumbers.jl:58
  [8] #1155
    @ ~/.julia/packages/CUDA/2kjXI/src/compiler/execution.jl:186
  [9] _broadcast_getindex_evalf
    @ ./broadcast.jl:673
 [10] _broadcast_getindex
    @ ./broadcast.jl:646
 [11] getindex
    @ ./broadcast.jl:605
 [12] #34
    @ ~/.julia/packages/GPUArrays/qt4ax/src/host/broadcast.jl:59
Reason: unsupported call to a lazy-initialized function (call to jl_string_to_genericmemory)
Stacktrace:
  [1] unsafe_wrap
    @ ./strings/string.jl:119
  [2] StringMemory
    @ ./iobuffer.jl:44
  [3] #IOBuffer#519
    @ ./iobuffer.jl:128
  [4] GenericIOBuffer
    @ ./iobuffer.jl:119
  [5] throw_converterror
    @ ~/.julia/packages/FixedPointNumbers/Dn4hv/src/FixedPointNumbers.jl:323
  [6] _convert
    @ ~/.julia/packages/FixedPointNumbers/Dn4hv/src/fixed.jl:81
  [7] FixedPoint
    @ ~/.julia/packages/FixedPointNumbers/Dn4hv/src/FixedPointNumbers.jl:58
  [8] #1155
    @ ~/.julia/packages/CUDA/2kjXI/src/compiler/execution.jl:186
  [9] _broadcast_getindex_evalf
    @ ./broadcast.jl:673
 [10] _broadcast_getindex
    @ ./broadcast.jl:646
 [11] getindex
    @ ./broadcast.jl:605
 [12] #34
    @ ~/.julia/packages/GPUArrays/qt4ax/src/host/broadcast.jl:59
Reason: unsupported call to an external C function (call to ijl_alloc_string)
Stacktrace:
  [1] _string_n
    @ ./strings/string.jl:109
  [2] StringMemory
    @ ./iobuffer.jl:44
  [3] _similar_data
    @ ./iobuffer.jl:156
  [4] _resize!
    @ ./iobuffer.jl:317
  [5] ensureroom
    @ ./iobuffer.jl:401
  [6] unsafe_write
    @ ./iobuffer.jl:522
  [7] unsafe_write
    @ ./io.jl:452
  [8] unsafe_write
    @ ./io.jl:803
  [9] write
    @ ./io.jl:837
 [10] show
    @ ./ryu/Ryu.jl:118
 [11] multiple call sites
    @ unknown:0
Reason: unsupported call to a lazy-initialized function (call to jl_string_to_genericmemory)
Stacktrace:
  [1] unsafe_wrap
    @ ./strings/string.jl:119
  [2] StringMemory
    @ ./iobuffer.jl:44
  [3] _similar_data
    @ ./iobuffer.jl:156
  [4] _resize!
    @ ./iobuffer.jl:317
  [5] ensureroom
    @ ./iobuffer.jl:401
  [6] unsafe_write
    @ ./iobuffer.jl:522
  [7] unsafe_write
    @ ./io.jl:452
  [8] unsafe_write
    @ ./io.jl:803
  [9] write
    @ ./io.jl:837
 [10] show
    @ ./ryu/Ryu.jl:118
 [11] multiple call sites
    @ unknown:0
Reason: unsupported call to an external C function (call to ijl_alloc_string)
Stacktrace:
  [1] _string_n
    @ ./strings/string.jl:109
  [2] StringMemory
    @ ./iobuffer.jl:44
  [3] _similar_data
    @ ./iobuffer.jl:156
  [4] ensureroom_slowpath
    @ ./iobuffer.jl:371
  [5] ensureroom
    @ ./iobuffer.jl:396
  [6] unsafe_write
    @ ./iobuffer.jl:522
  [7] unsafe_write
    @ ./io.jl:452
  [8] unsafe_write
    @ ./io.jl:803
  [9] write
    @ ./io.jl:837
 [10] show
    @ ./ryu/Ryu.jl:118
 [11] multiple call sites
    @ unknown:0
Reason: unsupported call to a lazy-initialized function (call to jl_string_to_genericmemory)
Stacktrace:
  [1] unsafe_wrap
    @ ./strings/string.jl:119
  [2] StringMemory
    @ ./iobuffer.jl:44
  [3] _similar_data
    @ ./iobuffer.jl:156
  [4] ensureroom_slowpath
    @ ./iobuffer.jl:371
  [5] ensureroom
    @ ./iobuffer.jl:396
  [6] unsafe_write
    @ ./iobuffer.jl:522
  [7] unsafe_write
    @ ./io.jl:452
  [8] unsafe_write
    @ ./io.jl:803
  [9] write
    @ ./io.jl:837
 [10] show
    @ ./ryu/Ryu.jl:118
 [11] multiple call sites
    @ unknown:0
Reason: unsupported call to an unknown function (call to jl_alloc_genericmemory)
Stacktrace:
 [1] GenericMemory
   @ ./boot.jl:516
 [2] array_new_memory
   @ ./Base.jl:335
 [3] #133
   @ ./array.jl:1129
 [4] _growend!
   @ ./array.jl:1116
 [5] resize!
   @ ./array.jl:1450
 [6] show
   @ ./ryu/Ryu.jl:118
 [7] multiple call sites
   @ unknown:0
Reason: unsupported call to an external C function (call to ijl_alloc_string)
Stacktrace:
 [1] _string_n
   @ ./strings/string.jl:109
 [2] array_new_memory
   @ ./Base.jl:331
 [3] #133
   @ ./array.jl:1129
 [4] _growend!
   @ ./array.jl:1116
 [5] resize!
   @ ./array.jl:1450
 [6] show
   @ ./ryu/Ryu.jl:118
 [7] multiple call sites
   @ unknown:0
Reason: unsupported call to a lazy-initialized function (call to jl_string_to_genericmemory)
Stacktrace:
 [1] array_new_memory
   @ ./Base.jl:332
 [2] #133
   @ ./array.jl:1129
 [3] _growend!
   @ ./array.jl:1116
 [4] resize!
   @ ./array.jl:1450
 [5] show
   @ ./ryu/Ryu.jl:118
 [6] multiple call sites
   @ unknown:0
Hint: catch this exception as `err` and call `code_typed(err; interactive = true)` to introspect the erronous code with Cthulhu.jl
Stacktrace:
  [1] check_ir(job::GPUCompiler.CompilerJob{GPUCompiler.PTXCompilerTarget, CUDA.CUDACompilerParams}, args::LLVM.Module)
    @ GPUCompiler ~/.julia/packages/GPUCompiler/2CW9L/src/validation.jl:147
  [2] macro expansion
    @ ~/.julia/packages/GPUCompiler/2CW9L/src/driver.jl:382 [inlined]
  [3] macro expansion
    @ ~/.julia/packages/TimerOutputs/6KVfH/src/TimerOutput.jl:253 [inlined]
  [4] macro expansion
    @ ~/.julia/packages/GPUCompiler/2CW9L/src/driver.jl:381 [inlined]
  [5] emit_llvm(job::GPUCompiler.CompilerJob; toplevel::Bool, libraries::Bool, optimize::Bool, cleanup::Bool, validate::Bool, only_entry::Bool)
    @ GPUCompiler ~/.julia/packages/GPUCompiler/2CW9L/src/utils.jl:108
  [6] emit_llvm
    @ ~/.julia/packages/GPUCompiler/2CW9L/src/utils.jl:106 [inlined]
  [7] codegen(output::Symbol, job::GPUCompiler.CompilerJob; toplevel::Bool, libraries::Bool, optimize::Bool, cleanup::Bool, validate::Bool, strip::Bool, only_entry::Bool, parent_job::Nothing)
    @ GPUCompiler ~/.julia/packages/GPUCompiler/2CW9L/src/driver.jl:100
  [8] codegen
    @ ~/.julia/packages/GPUCompiler/2CW9L/src/driver.jl:82 [inlined]
  [9] compile(target::Symbol, job::GPUCompiler.CompilerJob; kwargs::@Kwargs{})
    @ GPUCompiler ~/.julia/packages/GPUCompiler/2CW9L/src/driver.jl:79
 [10] compile
    @ ~/.julia/packages/GPUCompiler/2CW9L/src/driver.jl:74 [inlined]
 [11] #1145
    @ ~/.julia/packages/CUDA/2kjXI/src/compiler/compilation.jl:250 [inlined]
 [12] JuliaContext(f::CUDA.var"#1145#1148"{GPUCompiler.CompilerJob{GPUCompiler.PTXCompilerTarget, CUDA.CUDACompilerParams}}; kwargs::@Kwargs{})
    @ GPUCompiler ~/.julia/packages/GPUCompiler/2CW9L/src/driver.jl:34
 [13] JuliaContext(f::Function)
    @ GPUCompiler ~/.julia/packages/GPUCompiler/2CW9L/src/driver.jl:25
 [14] compile(job::GPUCompiler.CompilerJob)
    @ CUDA ~/.julia/packages/CUDA/2kjXI/src/compiler/compilation.jl:249
 [15] actual_compilation(cache::Dict{Any, CuFunction}, src::Core.MethodInstance, world::UInt64, cfg::GPUCompiler.CompilerConfig{GPUCompiler.PTXCompilerTarget, CUDA.CUDACompilerParams}, compiler::typeof(CUDA.compile), linker::typeof(CUDA.link))
    @ GPUCompiler ~/.julia/packages/GPUCompiler/2CW9L/src/execution.jl:237
 [16] cached_compilation(cache::Dict{Any, CuFunction}, src::Core.MethodInstance, cfg::GPUCompiler.CompilerConfig{GPUCompiler.PTXCompilerTarget, CUDA.CUDACompilerParams}, compiler::Function, linker::Function)
    @ GPUCompiler ~/.julia/packages/GPUCompiler/2CW9L/src/execution.jl:151
 [17] macro expansion
    @ ~/.julia/packages/CUDA/2kjXI/src/compiler/execution.jl:380 [inlined]
 [18] macro expansion
    @ ./lock.jl:273 [inlined]
 [19] cufunction(f::GPUArrays.var"#34#36", tt::Type{Tuple{CUDA.CuKernelContext, CuDeviceVector{Q24f7, 1}, Base.Broadcast.Broadcasted{CUDA.CuArrayStyle{1, CUDA.DeviceMemory}, Tuple{Base.OneTo{Int64}}, CUDA.var"#1155#1156"{Q24f7}, Tuple{Base.Broadcast.Extruded{CuDeviceVector{Float32, 1}, Tuple{Bool}, Tuple{Int64}}}}, Int64}}; kwargs::@Kwargs{})
    @ CUDA ~/.julia/packages/CUDA/2kjXI/src/compiler/execution.jl:375
 [20] cufunction
    @ ~/.julia/packages/CUDA/2kjXI/src/compiler/execution.jl:372 [inlined]
 [21] macro expansion
    @ ~/.julia/packages/CUDA/2kjXI/src/compiler/execution.jl:112 [inlined]
 [22] #launch_heuristic#1200
    @ ~/.julia/packages/CUDA/2kjXI/src/gpuarrays.jl:17 [inlined]
 [23] launch_heuristic
    @ ~/.julia/packages/CUDA/2kjXI/src/gpuarrays.jl:15 [inlined]
 [24] _copyto!
    @ ~/.julia/packages/GPUArrays/qt4ax/src/host/broadcast.jl:78 [inlined]
 [25] copyto!
    @ ~/.julia/packages/GPUArrays/qt4ax/src/host/broadcast.jl:44 [inlined]
 [26] copy
    @ ~/.julia/packages/GPUArrays/qt4ax/src/host/broadcast.jl:29 [inlined]
 [27] materialize(bc::Base.Broadcast.Broadcasted{CUDA.CuArrayStyle{1, CUDA.DeviceMemory}, Nothing, Type{Q24f7}, Tuple{CuArray{Float32, 1, CUDA.DeviceMemory}}})
    @ Base.Broadcast ./broadcast.jl:867
 [28] top-level scope
    @ /data/ALOS/rosamond/julia_backproject/fp_gpu.jl:9
in expression starting at /data/ALOS/rosamond/julia_backproject/fp_gpu.jl:9

I've had trouble with the converting constructors for float Fixed{T,f}(v::Float64) and fixed-point Fixed{T,f}(v::Fixed{T2,f2}) types on GPU. The ctor with the dummy parameter Fixed{T,f}(v::Integer, _) seems to work fine but is pretty low-level. Personally I'm okay doing the float conversion on CPU and copying to GPU, but the fixed-to-fixed conversions need to happen on the device throughout my algorithm.

I'm pretty new to both this package and CUDA.jl so I don't have a good sense of how to proceed or how much work would be involved.

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