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Base._cpow is type unstable #441

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dominic-chang opened this issue Sep 30, 2024 · 3 comments
Open

Base._cpow is type unstable #441

dominic-chang opened this issue Sep 30, 2024 · 3 comments
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help wanted Extra attention is needed

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@dominic-chang
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dominic-chang commented Sep 30, 2024 •
edited by christiangnrd
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Broadcasting over Base._cpow with a MtlArray causes an error due to type promotion in Metalv1.3.0

MWE: 
Base._cpow.(Metal.rand(Complex{Float32}, 1), 0.5f0)

ERROR: InvalidIRError: compiling MethodInstance for (::Metal.var"#broadcast_linear#216")(::MtlDeviceVector{…}, ::Base.Broadcast.Broadcasted{…}) resulted in invalid LLVM IR
Reason: unsupported call to an unknown function (call to gpu_malloc)
Stacktrace:
  [1] malloc
    @ ~/.julia/packages/GPUCompiler/2CW9L/src/runtime.jl:85
  [2] macro expansion
    @ ~/.julia/packages/GPUCompiler/2CW9L/src/runtime.jl:180
  [3] macro expansion
    @ ./none:0
  [4] box
    @ ./none:0
  [5] box_float32
    @ ~/.julia/packages/GPUCompiler/2CW9L/src/runtime.jl:209
  [6] Int64
    @ ./float.jl:912
  [7] convert
    @ ./number.jl:7
  [8] _cpow
    @ ./complex.jl:794
  [9] _broadcast_getindex_evalf
    @ ./broadcast.jl:709
 [10] _broadcast_getindex
    @ ./broadcast.jl:682
 [11] getindex
    @ ./broadcast.jl:636
 [12] broadcast_linear
    @ ~/.julia/packages/Metal/UcSBS/src/broadcast.jl:89
Reason: unsupported use of double value
Stacktrace:
 [1] Float64
   @ ./float.jl:261
 [2] <
   @ ./float.jl:601
 [3] _cpow
   @ ./complex.jl:786
 [4] _broadcast_getindex_evalf
   @ ./broadcast.jl:709
 [5] _broadcast_getindex
   @ ./broadcast.jl:682
 [6] getindex
   @ ./broadcast.jl:636
 [7] broadcast_linear
   @ ~/.julia/packages/Metal/UcSBS/src/broadcast.jl:89
Reason: unsupported use of double value
Stacktrace:
 [1] <
   @ ./float.jl:536
 [2] <
   @ ./float.jl:601
 [3] _cpow
   @ ./complex.jl:786
 [4] _broadcast_getindex_evalf
   @ ./broadcast.jl:709
 [5] _broadcast_getindex
   @ ./broadcast.jl:682
 [6] getindex
   @ ./broadcast.jl:636
 [7] broadcast_linear
   @ ~/.julia/packages/Metal/UcSBS/src/broadcast.jl:89
Reason: unsupported use of double value
Stacktrace:
  [1] Float64
    @ ./float.jl:261
  [2] convert
    @ ./number.jl:7
  [3] Complex
    @ ./complex.jl:14
  [4] Complex
    @ ./complex.jl:43
  [5] convert
    @ ./number.jl:7
  [6] widen
    @ ./operators.jl:891
  [7] inv
    @ ./complex.jl:471
  [8] _cpow
    @ ./complex.jl:808
  [9] _broadcast_getindex_evalf
    @ ./broadcast.jl:709
 [10] _broadcast_getindex
    @ ./broadcast.jl:682
 [11] getindex
    @ ./broadcast.jl:636
 [12] broadcast_linear
    @ ~/.julia/packages/Metal/UcSBS/src/broadcast.jl:89
Reason: unsupported use of double value
Stacktrace:
  [1] Float64
    @ ./float.jl:261
  [2] convert
    @ ./number.jl:7
  [3] Complex
    @ ./complex.jl:14
  [4] Complex
    @ ./complex.jl:43
  [5] convert
    @ ./number.jl:7
  [6] widen
    @ ./operators.jl:891
  [7] inv
    @ ./complex.jl:471
  [8] _cpow
    @ ./complex.jl:808
  [9] _broadcast_getindex_evalf
    @ ./broadcast.jl:709
 [10] _broadcast_getindex
    @ ./broadcast.jl:682
 [11] getindex
    @ ./broadcast.jl:636
 [12] broadcast_linear
    @ ~/.julia/packages/Metal/UcSBS/src/broadcast.jl:89
Reason: unsupported use of double value
Stacktrace:
 [1] abs
   @ ./float.jl:610
 [2] isinf
   @ ./float.jl:635
 [3] inv
   @ ./complex.jl:472
 [4] _cpow
   @ ./complex.jl:808
 [5] _broadcast_getindex_evalf
   @ ./broadcast.jl:709
 [6] _broadcast_getindex
   @ ./broadcast.jl:682
 [7] getindex
   @ ./broadcast.jl:636
 [8] broadcast_linear
   @ ~/.julia/packages/Metal/UcSBS/src/broadcast.jl:89
Reason: unsupported use of double value
Stacktrace:
 [1] isinf
   @ ./float.jl:635
 [2] inv
   @ ./complex.jl:472
 [3] _cpow
   @ ./complex.jl:808
 [4] _broadcast_getindex_evalf
   @ ./broadcast.jl:709
 [5] _broadcast_getindex
   @ ./broadcast.jl:682
 [6] getindex
   @ ./broadcast.jl:636
 [7] broadcast_linear
   @ ~/.julia/packages/Metal/UcSBS/src/broadcast.jl:89
Reason: unsupported use of double value
Stacktrace:
 [1] abs
   @ ./float.jl:610
 [2] isinf
   @ ./float.jl:635
 [3] inv
   @ ./complex.jl:472
 [4] _cpow
   @ ./complex.jl:808
 [5] _broadcast_getindex_evalf
   @ ./broadcast.jl:709
 [6] _broadcast_getindex
   @ ./broadcast.jl:682
 [7] getindex
   @ ./broadcast.jl:636
 [8] broadcast_linear
   @ ~/.julia/packages/Metal/UcSBS/src/broadcast.jl:89
Reason: unsupported use of double value
Stacktrace:
 [1] isinf
   @ ./float.jl:635
 [2] inv
   @ ./complex.jl:472
 [3] _cpow
   @ ./complex.jl:808
 [4] _broadcast_getindex_evalf
   @ ./broadcast.jl:709
 [5] _broadcast_getindex
   @ ./broadcast.jl:682
 [6] getindex
   @ ./broadcast.jl:636
 [7] broadcast_linear
   @ ~/.julia/packages/Metal/UcSBS/src/broadcast.jl:89
Reason: unsupported use of double value
Stacktrace:
 [1] *
   @ ./float.jl:411
 [2] literal_pow
   @ ./intfuncs.jl:332
 [3] inv
   @ ./complex.jl:473
 [4] _cpow
   @ ./complex.jl:808
 [5] _broadcast_getindex_evalf
   @ ./broadcast.jl:709
 [6] _broadcast_getindex
   @ ./broadcast.jl:682
 [7] getindex
   @ ./broadcast.jl:636
 [8] broadcast_linear
   @ ~/.julia/packages/Metal/UcSBS/src/broadcast.jl:89
Reason: unsupported use of double value
Stacktrace:
 [1] muladd
   @ ./float.jl:414
 [2] inv
   @ ./complex.jl:473
 [3] _cpow
   @ ./complex.jl:808
 [4] _broadcast_getindex_evalf
   @ ./broadcast.jl:709
 [5] _broadcast_getindex
   @ ./broadcast.jl:682
 [6] getindex
   @ ./broadcast.jl:636
 [7] broadcast_linear
   @ ~/.julia/packages/Metal/UcSBS/src/broadcast.jl:89
Reason: unsupported use of double value
Stacktrace:
 [1] muladd
   @ ./float.jl:414
 [2] inv
   @ ./complex.jl:473
 [3] _cpow
   @ ./complex.jl:808
 [4] _broadcast_getindex_evalf
   @ ./broadcast.jl:709
 [5] _broadcast_getindex
   @ ./broadcast.jl:682
 [6] getindex
   @ ./broadcast.jl:636
 [7] broadcast_linear
   @ ~/.julia/packages/Metal/UcSBS/src/broadcast.jl:89
Reason: unsupported use of double value
Stacktrace:
 [1] /
   @ ./float.jl:412
 [2] inv
   @ ./number.jl:255
 [3] inv
   @ ./complex.jl:473
 [4] _cpow
   @ ./complex.jl:808
 [5] _broadcast_getindex_evalf
   @ ./broadcast.jl:709
 [6] _broadcast_getindex
   @ ./broadcast.jl:682
 [7] getindex
   @ ./broadcast.jl:636
 [8] broadcast_linear
   @ ~/.julia/packages/Metal/UcSBS/src/broadcast.jl:89
Reason: unsupported use of double value
Stacktrace:
 [1] *
   @ ./float.jl:411
 [2] inv
   @ ./complex.jl:474
 [3] _cpow
   @ ./complex.jl:808
 [4] _broadcast_getindex_evalf
   @ ./broadcast.jl:709
 [5] _broadcast_getindex
   @ ./broadcast.jl:682
 [6] getindex
   @ ./broadcast.jl:636
 [7] broadcast_linear
   @ ~/.julia/packages/Metal/UcSBS/src/broadcast.jl:89
Reason: unsupported use of double value
Stacktrace:
 [1] -
   @ ./float.jl:407
 [2] inv
   @ ./complex.jl:474
 [3] _cpow
   @ ./complex.jl:808
 [4] _broadcast_getindex_evalf
   @ ./broadcast.jl:709
 [5] _broadcast_getindex
   @ ./broadcast.jl:682
 [6] getindex
   @ ./broadcast.jl:636
 [7] broadcast_linear
   @ ~/.julia/packages/Metal/UcSBS/src/broadcast.jl:89
Reason: unsupported use of double value
Stacktrace:
 [1] *
   @ ./float.jl:411
 [2] inv
   @ ./complex.jl:474
 [3] _cpow
   @ ./complex.jl:808
 [4] _broadcast_getindex_evalf
   @ ./broadcast.jl:709
 [5] _broadcast_getindex
   @ ./broadcast.jl:682
 [6] getindex
   @ ./broadcast.jl:636
 [7] broadcast_linear
   @ ~/.julia/packages/Metal/UcSBS/src/broadcast.jl:89
Reason: unsupported use of double value
Stacktrace:
  [1] Float32
    @ ./float.jl:258
  [2] convert
    @ ./number.jl:7
  [3] Complex
    @ ./complex.jl:14
  [4] Complex
    @ ./complex.jl:43
  [5] convert
    @ ./number.jl:7
  [6] oftype
    @ ./essentials.jl:522
  [7] inv
    @ ./complex.jl:474
  [8] _cpow
    @ ./complex.jl:808
  [9] _broadcast_getindex_evalf
    @ ./broadcast.jl:709
 [10] _broadcast_getindex
    @ ./broadcast.jl:682
 [11] getindex
    @ ./broadcast.jl:636
 [12] broadcast_linear
    @ ~/.julia/packages/Metal/UcSBS/src/broadcast.jl:89
Reason: unsupported use of double value
Stacktrace:
  [1] Float32
    @ ./float.jl:258
  [2] convert
    @ ./number.jl:7
  [3] Complex
    @ ./complex.jl:14
  [4] Complex
    @ ./complex.jl:43
  [5] convert
    @ ./number.jl:7
  [6] oftype
    @ ./essentials.jl:522
  [7] inv
    @ ./complex.jl:474
  [8] _cpow
    @ ./complex.jl:808
  [9] _broadcast_getindex_evalf
    @ ./broadcast.jl:709
 [10] _broadcast_getindex
    @ ./broadcast.jl:682
 [11] getindex
    @ ./broadcast.jl:636
 [12] broadcast_linear
    @ ~/.julia/packages/Metal/UcSBS/src/broadcast.jl:89
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.MetalCompilerTarget, Metal.MetalCompilerParams}, 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/Lw5SP/src/TimerOutput.jl:253 [inlined]
  [4] macro expansion
    @ ~/.julia/packages/GPUCompiler/2CW9L/src/driver.jl:381 [inlined]
  [5] 
    @ GPUCompiler ~/.julia/packages/GPUCompiler/2CW9L/src/utils.jl:108
  [6] emit_llvm
    @ ~/.julia/packages/GPUCompiler/2CW9L/src/utils.jl:106 [inlined]
  [7] 
    @ 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] (::Metal.var"#154#162"{GPUCompiler.CompilerJob{…}})(ctx::LLVM.Context)
    @ Metal ~/.julia/packages/Metal/UcSBS/src/compiler/compilation.jl:101
 [12] JuliaContext(f::Metal.var"#154#162"{GPUCompiler.CompilerJob{…}}; 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] macro expansion
    @ ~/.julia/packages/Metal/UcSBS/src/compiler/compilation.jl:100 [inlined]
 [15] macro expansion
    @ ~/.julia/packages/ObjectiveC/C7BVt/src/os.jl:264 [inlined]
 [16] compile(job::GPUCompiler.CompilerJob)
    @ Metal ~/.julia/packages/Metal/UcSBS/src/compiler/compilation.jl:98
 [17] actual_compilation(cache::Dict{…}, src::Core.MethodInstance, world::UInt64, cfg::GPUCompiler.CompilerConfig{…}, compiler::typeof(Metal.compile), linker::typeof(Metal.link))
    @ GPUCompiler ~/.julia/packages/GPUCompiler/2CW9L/src/execution.jl:237
 [18] cached_compilation(cache::Dict{…}, src::Core.MethodInstance, cfg::GPUCompiler.CompilerConfig{…}, compiler::Function, linker::Function)
    @ GPUCompiler ~/.julia/packages/GPUCompiler/2CW9L/src/execution.jl:151
 [19] macro expansion
    @ ~/.julia/packages/Metal/UcSBS/src/compiler/execution.jl:185 [inlined]
 [20] macro expansion
    @ ./lock.jl:267 [inlined]
 [21] mtlfunction(f::Metal.var"#broadcast_linear#216", tt::Type{Tuple{…}}; name::Nothing, kwargs::@Kwargs{})
    @ Metal ~/.julia/packages/Metal/UcSBS/src/compiler/execution.jl:180
 [22] mtlfunction
    @ ~/.julia/packages/Metal/UcSBS/src/compiler/execution.jl:178 [inlined]
 [23] macro expansion
    @ ~/.julia/packages/Metal/UcSBS/src/compiler/execution.jl:85 [inlined]
 [24] _copyto!
    @ ~/.julia/packages/Metal/UcSBS/src/broadcast.jl:95 [inlined]
 [25] copyto!
    @ ~/.julia/packages/Metal/UcSBS/src/broadcast.jl:47 [inlined]
 [26] copy
    @ ~/.julia/packages/GPUArrays/qt4ax/src/host/broadcast.jl:29 [inlined]
 [27] materialize(bc::Base.Broadcast.Broadcasted{Metal.MtlArrayStyle{…}, Nothing, typeof(Base._cpow), Tuple{…}})
    @ Base.Broadcast ./broadcast.jl:903
 [28] top-level scope
    @ REPL[55]:1
Some type information was truncated. Use `show(err)` to see complete types.
@maleadt maleadt added enhancement help wanted Extra attention is needed labels Oct 7, 2024
@maleadt
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maleadt commented Oct 7, 2024

Yes, the currently implementation of Base._cpow looks GPU-incompatible, or at least Metal.jl-incompatible. We would need a custom function that doesn't fall back to Float64 for its internal computations, but I'm unfamiliar with the operation.

@dominic-chang
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Yeah, I was thinking maybe the glibc implementation of cpowf

@maleadt
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maleadt commented Oct 8, 2024

Musl defines cpowf(z,c) as cexpf(c * clogf(z)); maybe that would work here if exp(::Float32) and log(::Float32) work as expected?

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@maleadt @tgymnich @dominic-chang