1407535 - (Rabaldr-ARM64) [meta] ARM64 support for wasm baseline (Rabaldr)

Status: RESOLVED FIXED

(Core :: JavaScript Engine: JIT, enhancement, P3)

Description

[Lars T Hansen [:lth]]

A fairly modest amount of effort is necessary to support WebAssembly on aarch64 with a baseline-only strategy.  At least the following work items:

* stubs for calling in and calling out
* interrupt / signal handling for OOB handling
* huge-memory support
* register assignment, architecture strategies, frame layouts, etc
* port the baseline compiler by instantiating its porting APIs, generalizing
* fill in many assembler macros that are now MOZ_CRASH, this includes some
  hard OOL cases (non-trivial amounts of logic)
* resolve the simulator situation wrt atomics (useless, last we looked)

The baseline compiler is becoming large enough that it is also time to refactor it a bit, so that work should happen first.

Comment 1

[Lars T Hansen [:lth]]

Attachment: arm64-queue.bundle

WIP.  Adds most of the ARM64 support to wasm baseline (all except some atomics support and two OOL cases).  Initial work on masm and other issues.

Comment 2

[Lars T Hansen [:lth]]

Attachment: arm64-rollup.patch

Rollup patch - enough support to actually compile and run some code.  (An old Smalltalk joke holds that your engine works when it can execute "3+4" correctly.  This queue can do that.)

Comment 3

[Lars T Hansen [:lth]]

Attachment: bug1407535-wip-rabaldr-arm64.patch

Work in progress.

Comment 4

[Lars T Hansen [:lth]]

I have some stubs work left but won't do that until the stubs rewrite lands.

Comment 5

[Lars T Hansen [:lth]]

Attachment: bug1407535-wip-rabaldr-arm64-v2.patch

Comment 6

[Lars T Hansen [:lth]]

Try run for final patch queue is green:
https://treeherder.mozilla.org/#/jobs?repo=try&revision=fed7d260309c153fc78ec295297a601a37926319

Hardware testing is green.

Waiting on a couple of minor reviews; basically ready to land.

Comment 7

[Lars T Hansen [:lth]]

... and it runs my wasm raytracer demo on my Nexus 5X.  My work here is done.