tree 03948b83317a26c3a1c176c3bfd102a044b0beca
parent 4f3a0ca85d28a8fc7fcc1ac5c4a1864c66bdea14
author mtklein <mtklein@chromium.org> 1471897218 -0700
committer Commit bot <commit-bot@chromium.org> 1471897218 -0700

Flush denorm half floats to zero.

I think we convinced ourselves that denorms, while a good chunk of half floats,
cover a rather small fraction of the representable range, which is always
close enough to zero to flush.

This makes both paths of the conversion to or from float considerably simpler.

These functions now work for zero-or-normal half floats (excluding infinite, NaN).
I'm not aware of a term for this class so I've called them "ordinary".

A handful of GMs and SKPs draw differently in --config f16, but all imperceptibly.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2256023002

Review-Url: https://codereview.chromium.org/2256023002