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Daily Perf Improver - Optimize dot product with Vector.Sum horizontal reduction #33

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Merged
merged 3 commits into from
Oct 17, 2025
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Daily Perf Improver - Optimize dot product with Vector.Sum horizontal reduction #33

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5699273
Optimize dot product horizontal reduction with Vector.Sum
github-actions[bot] Oct 12, 2025
588e729
Merge branch 'main' into perf/optimize-dot-product-pairwise-reduction…
dsyme Oct 12, 2025
5089504
Merge branch 'main' into perf/optimize-dot-product-pairwise-reduction…
dsyme Oct 14, 2025
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6 changes: 3 additions & 3 deletions src/FsMath/SpanMath.fs
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Original file line number Diff line number Diff line change
Expand Up @@ -36,10 +36,10 @@ type SpanMath =
let vy = Numerics.Vector<'T>(y.Slice(yi, simdWidth))
accVec <- accVec + (vx * vy)

let mutable acc = LanguagePrimitives.GenericZero<'T>
for i = 0 to simdWidth - 1 do
acc <- acc + accVec.[i]
// Use Vector.Sum for optimized horizontal reduction (uses hardware-specific instructions)
let mutable acc = Numerics.Vector.Sum(accVec)

// Handle remaining elements (tail)
for i = ceiling to length - 1 do
acc <- acc + x.[xOffset + i] * y.[yOffset + i]

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