Implement NEON mixing for AArch64 to replace scalar fallback - #409
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NEON implementation of the generic channel mixer (FAudio_INTERNAL_Mix_Generic_NEON). I believe the code can be optimized further but the goal was to match the implementation of the SSE
FAudio_INTERNAL_Mix_Generic_SSE2variant, not to beat it.Performance:
src→dst ; speedup
4 → 2 ; 2.12x
8 → 8 ; 1.90x
4 → 8 ; 1.79x
8 → 2 ; 1.71x
2 → 2 ; 1.32x
6 → 8 ; 1.03x