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Measured on RDNA2 in #697: an invalid product or sum (inf * 0, inf - inf) gives the negative default NaN, 0xffc00000 or 0xfe00, and beats a NaN addend. A NaN delta, then a NaN coordinate, still wins, quieted; a NaN addend is returned quieted only when the product is valid. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>