tree e78ede3628ab1385d4509b958886df0f01727001
parent c24705506f8ad099bd4d4e5bef1e97f91c2af351
author Mike Klein <mtklein@google.com> 1562872000 -0500
committer Skia Commit-Bot <skia-commit-bot@chromium.org> 1562936004 +0000

bidirectional Labels

Support forward references in Label.

In addition to tracking the current Label offset (used for
backward references essentially just the same as before this CL)
we also store a list of instructions that refer to each Label.
When a Label moves, each instruction gets a new displacement.

To make this a little easier, remove the 8-bit jump form on x86...
this way all x86 displacements are 32-bit and and all ARM 19-bit.

For now only cbz() supports this, just to start somewhere.
More to do but it's worth an early design review.

Change-Id: I23d2bcd7742965ab694ae4828f53409cb9fc807f
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/226937
Commit-Queue: Mike Klein <mtklein@google.com>
Reviewed-by: Herb Derby <herb@google.com>