Open Bug 1810245 Opened 1 year ago Updated 4 months ago

Handle getters and custom data properties without an IC in Ion

Categories

(Core :: JavaScript Engine, enhancement, P3)

Product:
Core
Component:
JavaScript Engine
Type:
enhancement

Tracking

()

Status:
ASSIGNED

People

(Reporter: alexical, Assigned: alexical, NeedInfo)

References

(Blocks 1 open bug)

Details

(Whiteboard: [sp3])

We should be able to just tweak the megamorphic cache slightly to allow us to, from a new MIR op, gracefully fall back to a VM call in the case where a megamorphic GetProp/GetElem has a cache miss. Our failure to do this results in us transitioning to a generic mode IC, which shows up in Speedometer profiles as IonGetPropertyIC::update.

Assignee: nobody → dothayer
Status: NEW → ASSIGNED
Severity: -- → S3
Priority: -- → P1
Whiteboard: [sp3]

(Re-prioritizing P1 bugs)

Severity: S3 → N/A
Type: task → enhancement
Priority: P1 → P3

Hey Alex,

This seems like an interesting bug for me to explore, I am totally new contributor to SM could you guide as to what areas of the code i can read for this this? is there any previous revision implementing something similar and is there a code sample with which we can emulate this cache miss?

Thank you!

Flags: needinfo?(dothayer)
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