Bug 206912

Summary: Experiment with tweaking the alignment of instructions to avoid the perf issues from the recent Intel microcode update
Product: WebKit Reporter: Robin Morisset <rmorisset>
Component: JavaScriptCoreAssignee: Robin Morisset <rmorisset>
Status: NEW ---    
Severity: Normal CC: ews-watchlist, keith_miller, mark.lam, msaboff, saam, tzagallo
Priority: P2    
Version: WebKit Nightly Build   
Hardware: Unspecified   
OS: Unspecified   
Attachments:
Description Flags
WIP none

Description Robin Morisset 2020-01-28 15:55:28 PST 
See https://www.intel.com/content/dam/support/us/en/documents/processors/mitigations-jump-conditional-code-erratum.pdf

I am starting with a very basic patch which only deals with the simplest cases, in order to test if it actually brings us anything.
Comment 1 Robin Morisset 2020-01-28 15:55:48 PST 
Created attachment 389080 [details]
WIP