1169167 - AsmJS Baseline Compiler

Status: RESOLVED DUPLICATE of bug 1232205

(Core :: JavaScript Engine: JIT, defect)

Description

[Benjamin Bouvier [:bbouvier] (inactive)]

First compilation of asm.js modules can take some time, especially on phones and/or for big codebases. As a user, I don't want to have to wait too much the first time before being able to play / use the program. The idea of an asm.js baseline compiler would be to quickly compile a asm.js module while the bigger Odin compilation is made in the background; and switch from the quickly compiled module to the odin module when there are no asm.js activations on the stack.

Comment 1

[Sean Stangl [:sstangl]]

Does this mean that Odin would have to support OSR?

Comment 2

[Luke Wagner [:luke]]

In the simplest incarnation, the swap would happen only when there were no activations on the stack (which currently happens once a frame).  (Also to be clear, this would be a custom asm.js baseline compiler, not reusing the existing baseline JS compiler.)  With bug 709490, workers may never have to return to the main thread, so we may need to cut over at the level of function calls (by having a uniform (native) call ABI and then patching baseline to optimized).