feat: φ-optimized FMA operations for GF16#55
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Add fused arithmetic to GF16 struct: - fma(a,b,c): a*b+c (single rounding) - fms(a,b,c): a*b-c - fnma(a,b,c): c-a*b (negated FMA) - phiFma(a,b,c): φ-weighted FMA with golden-ratio scaling - phiDot(a,b): φ-optimized dot product over slices Export via C-ABI (gf16_fms, gf16_fnma, gf16_phi_fma) and declare in gf16.h header. Add 5 new unit tests. Closes #4
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Summary
Implements issue #4 — φ-optimized fused multiply-add operations.
GF16 struct additions (
src/formats/golden_float16.zig):fma(a,b,c)— fused multiply-add: a×b+c (single rounding)fms(a,b,c)— fused multiply-subtract: a×b-cfnma(a,b,c)— fused negated multiply-add: c-a×bphiFma(a,b,c)— φ-weighted FMA with golden-ratio scaling (×φ²)phiDot(a,b)— φ-optimized dot product over slicesC-ABI exports (
src/c_abi.zig):gf16_fms,gf16_fnma,gf16_phi_fmaC header (
src/c/gf16.h): declares all new functionsTests: 5 new tests for FMA, FMS, FNMA, phiFMA, phiDot
Closes #4