2081933 - Skip cache-based override construction in the frame and sizing overloads of AnchorPosResolutionParams::From() when the supplied cache is null or the frame is in flow. Preserve the existing helper for other cases and clear only the position-area flag when

Status: UNCONFIRMED

(Core :: Performance: Automated Findings, defect)

Description

[perf-ai-bot]

Skip cache-based override construction in the frame and sizing overloads of AnchorPosResolutionParams::From() when the supplied cache is null or the frame is in flow. Preserve the existing helper for other cases and clear only the position-area flag when aIgnorePositionArea is set. Reported measurements do not establish an end-to-end performance gain.

Problem

The frame and sizing factories unconditionally used the out-of-line cache-based constructor even when its helper would return all-false flags for a null cache or an in-flow frame. This added avoidable call overhead to common reflow and intrinsic-sizing paths. The cache requirement does not apply to the separate computed-style overload, which derives override flags from stored anchor references.

Performance

• Benchmark: speedometer4-responsive-design
• Test: sp4-responsive-design
• Component: Layout
• Local Improvement: 0.73%

Validation

• Before profile
• After profile
• Try push
• Performance comparison

Comment 1

[perf-ai-bot]

Please move this bug to the correct component.

Once the Phabricator patch is ready for review, please commandeer it.

Comment 2

[perf-ai-bot]

Attachment: WIP: Bug 2081933 - Skip cache-based override construction in the frame and sizing overloads of AnchorPosResolutionParams::From() when the supplied cache is null or the frame is in flow. Preserve the existing helper for other cases and clear only the posit

Skip cache-based override construction in the frame and sizing overloads of AnchorPosResolutionParams::From() when the supplied cache is null or the frame is in flow. Preserve the existing helper for other cases and clear only the position-area flag when