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Optimize uniform Simpson #1171

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Merged
merged 1 commit into from
Oct 14, 2025
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Optimize uniform Simpson #1171

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9 changes: 4 additions & 5 deletions src/common/quadrature.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -64,11 +64,10 @@ simpson(y::AbstractVector, x::AbstractVector) = simpson((i, xi) -> y[i], x)
# Note: We used @turbo here before, but actually the allocation overhead
# needed to get all the data into an array is worse than what one gains
# with LoopVectorization
@fastmath @simd for i = 2:2:istop
I += @inline 4 / 3 * dx * integrand(i, x[i])
end
@fastmath @simd for i = 3:2:istop
I += @inline 2 / 3 * dx * integrand(i, x[i])
weven = 4 / 3 * dx
wodd = 2 / 3 * dx
@fastmath @simd for i = 2:istop
@inline I += iseven(i) ? weven * integrand(i, x[i]) : wodd * integrand(i, x[i])
end

if isodd(n_intervals)
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