File: Utilities/ArrayExtensions.cs
The hand-rolled equality loop uses boxed Equals(source[i], other[i]) — that's virtual dispatch and boxing for every element.
// BEFORE
if (!Equals(source[i], other[i])) ...
// AFTER — intrinsic-optimised, SIMD-enabled on .NET 8
return source.AsSpan().SequenceEqual(other.AsSpan());
MemoryExtensions.SequenceEqual is SIMD-vectorised by the JIT on .NET 8 and avoids all boxing. For long[] comparisons across the histogram counts array (which can be ~185KB), this is material.
File:
Utilities/ArrayExtensions.csThe hand-rolled equality loop uses boxed
Equals(source[i], other[i])— that's virtual dispatch and boxing for every element.MemoryExtensions.SequenceEqualis SIMD-vectorised by the JIT on .NET 8 and avoids all boxing. Forlong[]comparisons across the histogram counts array (which can be ~185KB), this is material.