Shows how a real input x rounds to each format, with a zoomed 1D map of rounding bins.
Each colored segment is the interval of reals that round to a single representable value.
Rounding mode: round-to-nearest, ties-to-even.
MXFP8 is block-scaled: an FP8 E4M3 element times a shared power-of-two
E8M0 scale X, derived here from the block's max magnitude
(X = 2^(floor(log2(blockMax)) − 8)).