tree b86944d559717eeee3589efa21dcfd30cbdd2f3d
parent 25d8498f8ba29c8dc055dd56113facbdbe154345
author Antonio Sanchez <cantonios@google.com> 1611198009 -0800
committer Rasmus Munk Larsen <rmlarsen@google.com> 1611257548 +0000

Fix pfrexp/pldexp for half.

The recent addition of vectorized pow (!330) relies on `pfrexp` and
`pldexp`.  This was missing for `Eigen::half` and `Eigen::bfloat16`.
Adding tests for these packet ops also exposed an issue with handling
negative values in `pfrexp`, returning an incorrect exponent.

Added the missing implementations, corrected the exponent in `pfrexp1`,
and added `packetmath` tests.