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Henrik RydgårdandClaude Opus 5.5
649561764d
The four lanes are computed together: exponents, 24x24-bit products with round-to-odd, alignment by truncation and a signed horizontal sum. One pairwise maximum finds both the alignment exponent and any inf or NaN, which go to the reference. The final rounding is branch-free and in integers, since the host rounding mode may be the game's. About three times the throughput of the reference on Apple M-series (5.2 vs 15.2 ns per call). VFPUDot checks it against the reference on four million inputs picked to cover cancellation, ties, subnormals and the overflow edges; a billion more matched offline. Co-Authored-By: Claude Opus 5.5 (1M context) <[email protected]>