Landing: 1d63e50467f1

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Project / Subsystem

gcc / phiprop

Date

2026-03-28

Author

Andrew Pinski

Commit

1d63e50467f140b4749065afb1c1b3f94c819de8

Source

github

Perf win

Yes

Breaking

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All attributes

project: gcc
subsystem: phiprop
patch_id: —
commit_hash: 1d63e50467f140b4749065afb1c1b3f94c819de8
source_type: github
headline: Phi-node Propagation: Skip Clobbers More Effectively
tldr: The phi-node propagation pass now skips over clobbering instructions more effectively, improving optimization opportunities.
author: Andrew Pinski
outcome: committed
performance_win: true
breaking_change: false
series_id: —
series_parts: []
tags: • optimization
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/1d63e50467f140b4749065afb1c1b3f94c819de8
date: 2026-03-28T00:00:00.000Z

This commit improves the phi-node propagation pass (phiprop) by enabling it to skip over clobbering instructions more effectively. This allows the pass to propagate values through more complex code sequences. The changes specifically handle cases where aggregates (structures or arrays) are involved, improving the accuracy and effectiveness of the optimization.