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The GE arithmetic in GEMath.h against values measured on a PSP: the reciprocal for sampled mantissas (gpu/probe exp15), the triangle setup reciprocal (exp38-41), antialiased line alphas (exp112), and the cases the other probes pinned down (float24 truncation, the adder and row sums, rsqrt, the mip log2, texture coordinate precision, the lighting pow and color scaling). Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>