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  • FMulAdd must compute c + ab; FNMulAdd must compute c - ab.
  • Corrects NEON/AARCH64 vs scalar mismatches observed in FastNoise2 consistency tests.
  • Minimal change: 2 insertions, 2 deletions in ToolSet/ARM/128/f32x4.h.

Posting this in case it will be faster to merge then #3

…mpute c + a*b; FNMulAdd must compute c - a*b.\nCorrects NEON/AARCH64 vs scalar mismatches in dependent projects.
@Auburn Auburn merged commit bc68fb0 into Auburn:master Sep 1, 2025
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