Bug 239258

Summary:	[JSC] Add partial inlining in the DFG/FTL
Product:	WebKit	Reporter:	Robin Morisset <rmorisset>
Component:	JavaScriptCore	Assignee:	Nobody <webkit-unassigned>
Status:	NEW ---
Severity:	Normal	CC:	webkit-bug-importer
Priority:	P2	Keywords:	InRadar
Version:	WebKit Nightly Build
Hardware:	Unspecified
OS:	Unspecified

Description Robin Morisset 2022-04-12 15:39:07 PDT

Some functions (e.g. the hottest function in the ML subtest of JetStream2 if I remember correctly) have the following structure:
- A switch or branch on the number of arguments, or the type of an argument, or the value of an argument
- All of the code is in the various branches.
- The function as a whole is too big to inline.
It would be great to be able to outline each of the branches, which would make the function as a whole trivially inlinable and would allow eliminating the branch in most cases.
According to some profiling I did a couple of years ago, it should have a significant impact on some subtests of JS2.

Comment 1 Radar WebKit Bug Importer 2022-04-19 15:40:12 PDT

<rdar://problem/91990465>