Don't read destination indices when copying structured matrices #55322
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jishnub
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linear algebra
ViralBShah
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Aug 6, 2024
lazarusA
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Aug 17, 2024
…aLang#55322) Fixes the following regression introduced in v1.11 ```julia julia> using LinearAlgebra julia> D = Diagonal(rand(4)); julia> T = Tridiagonal(Vector{BigFloat}(undef, 3), Vector{BigFloat}(undef, 4), Vector{BigFloat}(undef, 3)) 4×4 Tridiagonal{BigFloat, Vector{BigFloat}}: #undef #undef ⋅ ⋅ #undef #undef #undef ⋅ ⋅ #undef #undef #undef ⋅ ⋅ #undef #undef julia> copyto!(T, D) ERROR: UndefRefError: access to undefined reference Stacktrace: [1] getindex @ ./essentials.jl:907 [inlined] [2] _broadcast_getindex @ ./broadcast.jl:644 [inlined] [3] _getindex @ ./broadcast.jl:675 [inlined] [4] _broadcast_getindex @ ./broadcast.jl:650 [inlined] [5] getindex @ ./broadcast.jl:610 [inlined] [6] macro expansion @ ./broadcast.jl:973 [inlined] [7] macro expansion @ ./simdloop.jl:77 [inlined] [8] copyto! @ ./broadcast.jl:972 [inlined] [9] copyto! @ ./broadcast.jl:925 [inlined] [10] materialize! @ ./broadcast.jl:883 [inlined] [11] materialize! @ ./broadcast.jl:880 [inlined] [12] _copyto_banded!(T::Tridiagonal{BigFloat, Vector{BigFloat}}, D::Diagonal{Float64, Vector{Float64}}) @ LinearAlgebra ~/.julia/juliaup/julia-nightly/share/julia/stdlib/v1.12/LinearAlgebra/src/special.jl:323 [13] copyto!(dest::Tridiagonal{BigFloat, Vector{BigFloat}}, src::Diagonal{Float64, Vector{Float64}}) @ LinearAlgebra ~/.julia/juliaup/julia-nightly/share/julia/stdlib/v1.12/LinearAlgebra/src/special.jl:315 [14] top-level scope @ REPL[4]:1 ``` After this PR ```julia julia> copyto!(T, D) 4×4 Tridiagonal{BigFloat, Vector{BigFloat}}: 0.909968 0.0 ⋅ ⋅ 0.0 0.193341 0.0 ⋅ ⋅ 0.0 0.194794 0.0 ⋅ ⋅ 0.0 0.506905 ``` The current implementation used an optimization that may not be applicable for non-isbits types, and this PR ensures that we always read from the source and write to the destination.
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Seems to require #54041 to be relevant for backporting? |
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You're right, this does not need backporting. |
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Fixes the following regression introduced in v1.11
After this PR
The current implementation used an optimization that may not be applicable for non-isbits types, and this PR ensures that we always read from the source and write to the destination.