1322728 - [meta] Wasm baseline: Atomics

Status: RESOLVED WONTFIX

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

Description

[Lars T Hansen [:lth]]

Currently the wasm baseline compiler does not compile translated asm.js functions that use atomics.  We should change this.  I don't think this is particularly hard but it may be a fair amount of work (and it can be done piecemeal).

If we wait for bug 1312751 to land we get fence generation for load and store almost for free, though it's not hard to add fence generation to the existing load/store infrastructure in baseline.

In addition to that we need to implement exchange, add, sub, and, xor, and or, as well as compareExchange.

We need this on x64, x86, and ARM.

Existing MacroAssembler abstractions are probably sufficient, but if they aren't we should factor code out of the CodeGenerators into the upper MacroAssembler level.

Comment 1

[Lars T Hansen [:lth]]

Baseline will not support asm.js atomics (indeed no longer supports asm.js).  We'll create a new bug when we want to implement wasm atomics in baseline.