remove reg/imm unions
I've been looking to simplify and expand the kinds of instructions
we can support, and one easy early simplification is to break the
union of regs y,z and immy,immz into separate fields.
To further reinforce how unrelated they are, rename to immA,immB.
With the guaranteed two immediates available, we can simplify the
representation of some ops to use the immediates more naturally.
Change-Id: Iad139b5d77e8464e71f1360d881c1ed2e0957db8
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/355658
Reviewed-by: Herb Derby <herb@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
3 files changed