tree 645c437e737c4776145f05c34f1237e57c8df444
parent a3aee2678d07e249dca18493d2acd898eefd48dd
author Sanjay Patel <spatel@rotateright.com> 1600969469 -0400
committer Hans Wennborg <hans@chromium.org> 1601465323 +0200

[APFloat] prevent NaN morphing into Inf on conversion (PR43907)

We shift the significand right on a truncation, but that needs to be made NaN-safe:
always set at least 1 bit in the significand.
https://llvm.org/PR43907

See D88238 for the likely follow-up (but needs some plumbing fixes before it can proceed).

Differential Revision: https://reviews.llvm.org/D87835

(cherry picked from commit e34bd1e0b03d20a506ada156d87e1b3a96d82fa2)