Landing: 1bf4a46e9b5c

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Project / Subsystem

gcc / tree-ssa

Date

2026-05-28

Author

Roger Sayle

Commit

1bf4a46e9b5c2253afba434895e071ed0e95fc93

Source

github

Perf win

Yes

Breaking

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All attributes

project: gcc
subsystem: tree-ssa
patch_id: —
commit_hash: 1bf4a46e9b5c2253afba434895e071ed0e95fc93
source_type: github
headline: SSA Loop Optimizations: Store Motion Gets More Efficient
tldr: Refactors loop store motion code in GCC to avoid redundant checks and reduce memory usage.
author: Roger Sayle
outcome: committed
performance_win: true
breaking_change: false
series_id: —
series_parts: []
tags: • optimization
• ssa
• loop
• store motion
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/1bf4a46e9b5c2253afba434895e071ed0e95fc93
date: 2026-05-28T00:00:00.000Z

The loop store motion pass in GCC’s tree-ssa optimizer has been micro-optimized. The ref_always_accessed_p function was refactored and renamed to ref_always_stored_p, saving storage and avoiding redundant checks at runtime. This tightens up the loop invariant code motion pass, which hoists stores that are loop-invariant out of the loop, improving performance.