Landing: 194d91912cb3

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Project / Subsystem

gcc / gcc/tree-optimization

Date

2026-08-28

Author

Richard Biener

Commit

194d91912cb3fc86dcce7d13d2239f46ab988b03

Source

github

Perf win

Yes

Breaking

View on GitHub →

All attributes

project: gcc
subsystem: gcc/tree-optimization
patch_id: —
commit_hash: 194d91912cb3fc86dcce7d13d2239f46ab988b03
source_type: github
headline: Simplify BB reduction group splitting for vectorization
tldr: Vectorizer now picks the largest isomorphic subset for BB reduction, improving efficiency.
author: Richard Biener
outcome: committed
performance_win: true
breaking_change: false
series_id: —
series_parts: []
tags: • gcc
• vectorization
• optimization
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/194d91912cb3fc86dcce7d13d2239f46ab988b03
date: 2026-08-28T00:00:00.000Z

The GCC vectorizer simplifies the process of splitting basic blocks (BBs) for loop vectorization. It now identifies and selects the largest isomorphic subset of instructions within a BB reduction, allowing for more direct vectorization. This change enhances the efficiency of code generation by improving how instruction groups are chosen for vector processing.