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Generic path in ldiv! for Diagonal #1261

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Merged
merged 3 commits into from
Aug 21, 2025
Merged

Generic path in ldiv! for Diagonal #1261

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e507961
Generic path in ldiv! for Diagonal
jishnub Apr 4, 2025
d760b6a
Revert rdiv!
jishnub Apr 4, 2025
548cc05
Remove simd annotation in ldiv!
jishnub Apr 4, 2025
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16 changes: 13 additions & 3 deletions src/diagonal.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -601,10 +601,10 @@ function _rdiv!(B::AbstractVecOrMat, A::AbstractVecOrMat, D::Diagonal)
if (k = length(dd)) != n
throw(DimensionMismatch(lazy"left hand side has $n columns but D is $k by $k"))
end
@inbounds for j in 1:n
@inbounds for j in axes(A,2)
ddj = dd[j]
iszero(ddj) && throw(SingularException(j))
for i in 1:m
for i in axes(A,1)
B[i, j] = A[i, j] / ddj
end
end
Expand All @@ -629,7 +629,17 @@ function ldiv!(B::AbstractVecOrMat, D::Diagonal, A::AbstractVecOrMat)
(m, n) == (m′, n′) || throw(DimensionMismatch(lazy"expect output to be $m by $n, but got $m′ by $n′"))
j = findfirst(iszero, D.diag)
isnothing(j) || throw(SingularException(j))
@inbounds for j = 1:n, i = 1:m
_ldiv_Diagonal_loop!(B, D, A)
B
end
function _ldiv_Diagonal_loop!(B::AbstractVecOrMat, D::Diagonal, A::AbstractVecOrMat)
dd = D.diag
@. B = dd \ A
B
end
function _ldiv_Diagonal_loop!(B::StridedVecOrMat, D::Diagonal, A::StridedVecOrMat)
dd = D.diag
@inbounds for j in axes(A,2), i in axes(A,1)
B[i, j] = dd[i] \ A[i, j]
end
B
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