typeinstability.jl

julia> @code_warntype [sprand(10,10,.1) rand(10,10)]
Variables:
  #self#::Base.#hcat
  Xin::Tuple{SparseMatrixCSC{Float64,Int64},Array{Float64,2}}
  X::Array{SparseMatrixCSC{Tv,Ti<:Integer},1}
  #temp#@_4::Int64
  #temp#@_5::Int64
  #temp#@_6::Int64
  x::Union{Array{Float64,2},SparseMatrixCSC{Float64,Int64}}
  #temp#@_8::Int64
  #temp#@_9::Any

Body:
  begin  # sparse/sparsematrix.jl, line 2874:
      NewvarNode(:(X::Array{SparseMatrixCSC{Tv,Ti<:Integer},1}))
      GenSym(1) = (Base.nfields)(Xin::Tuple{SparseMatrixCSC{Float64,Int64},Array{Float64,2}})::Int64
      GenSym(2) = (top(ccall))(:jl_alloc_array_1d,(top(apply_type))(Core.Array,SparseMatrixCSC{Tv,Ti<:Integer},1)::Type{Array{SparseMatrixCSC{Tv,Ti<:Integer},1}},(top(svec))(Core.Any,Core.Int)::SimpleVector,Array{SparseMatrixCSC{Tv,Ti<:Integer},1},0,GenSym(1),0)::Array{SparseMatrixCSC{Tv,Ti<:Integer},1}
      #temp#@_4::Int64 = 1
      #temp#@_5::Int64 = 1
      #temp#@_6::Int64 = 0
      8: 
      unless (Base.box)(Base.Bool,(Base.not_int)((#temp#@_6::Int64 === GenSym(1))::Bool)) goto 36
      GenSym(3) = (Base.box)(Int64,(Base.add_int)(#temp#@_6::Int64,1))
      #temp#@_6::Int64 = GenSym(3)
      GenSym(9) = (Base.getfield)(Xin::Tuple{SparseMatrixCSC{Float64,Int64},Array{Float64,2}},#temp#@_5::Int64)::Union{Array{Float64,2},SparseMatrixCSC{Float64,Int64}}
      GenSym(10) = (Base.box)(Int64,(Base.add_int)(#temp#@_5::Int64,1))
      #temp#@_8::Int64 = 1
      GenSym(11) = GenSym(9)
      GenSym(12) = (Base.box)(Int64,(Base.add_int)(1,1))
      x::Union{Array{Float64,2},SparseMatrixCSC{Float64,Int64}} = GenSym(11)
      #temp#@_8::Int64 = GenSym(12)
      GenSym(13) = GenSym(10)
      GenSym(14) = (Base.box)(Int64,(Base.add_int)(2,1))
      #temp#@_5::Int64 = GenSym(13)
      #temp#@_8::Int64 = GenSym(14)
      unless (Base.SparseArrays.issparse)(x::Union{Array{Float64,2},SparseMatrixCSC{Float64,Int64}})::Bool goto 26
      #temp#@_9::Any = x::Union{Array{Float64,2},SparseMatrixCSC{Float64,Int64}}
      goto 28
      26: 
      #temp#@_9::Any = (Base.SparseArrays.sparse)(x::Union{Array{Float64,2},SparseMatrixCSC{Float64,Int64}})::SparseMatrixCSC{Float64,Int64}
      28: 
      GenSym(7) = #temp#@_9::Union{Array{Float64,2},SparseMatrixCSC{Float64,Int64}}
      $(Expr(:inbounds, true))
      (top(setindex!))(GenSym(2),GenSym(7),#temp#@_4::Int64)::Array{SparseMatrixCSC{Tv,Ti<:Integer},1}
      $(Expr(:inbounds, :pop))
      #temp#@_4::Int64 = (Base.box)(Int64,(Base.add_int)(#temp#@_4::Int64,1))
      34: 
      goto 8
      36: 
      37: 
      X::Array{SparseMatrixCSC{Tv,Ti<:Integer},1} = GenSym(2) # sparse/sparsematrix.jl, line 2875:
      return (top(_apply))(Base.SparseArrays.hcat,X::Array{SparseMatrixCSC{Tv,Ti<:Integer},1})::Union{Array{Any,1},SparseMatrixCSC{Tv,Ti<:Integer}}
  end::Union{Array{Any,1},SparseMatrixCSC{Tv,Ti<:Integer}}