tree 0485f05f131b6101c371ce2f1d0a6fe7b49ac41a
parent 74ad844086d721e1c3879a0010088f6137e8b44a
author Mike Klein <mtklein@google.com> 1561061024 -0500
committer Skia Commit-Bot <skia-commit-bot@chromium.org> 1561065916 +0000

two register + immediate ops

The encoding kind of all goes through the same paths,
as the three argument instructions, but like the nursery
rhyme when there are only two they kind of all roll over
and the op-extension hops into the bed.

vpermq is the first place we need to set the W bit
to indicate a 64-bit lane operation, so a little
minimal plumbing for that.  It takes its arguments
a little differently too, passing dst where you'd
expect, the source where we'd pass y, and requiring
us to pass literal 0000 for the vvvv bits in VEX
(inverted as normal to literal 1111).

Change-Id: I91a4cd1b316eb908992631ce8b2cb3c62078e8c6
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/222565
Commit-Queue: Mike Klein <mtklein@google.com>
Reviewed-by: Herb Derby <herb@google.com>