Landing: 19fae3c44356

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Project / Subsystem

gcc / tree-optimization

Date

2026-09-04

Author

Richard Biener

Commit

19fae3c44356017e3f36626d9d57fe0081533fad

Source

github

Perf win

Breaking

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All attributes

project: gcc
subsystem: tree-optimization
patch_id: —
commit_hash: 19fae3c44356017e3f36626d9d57fe0081533fad
source_type: github
headline: SLP schedule failure state caching improved.
tldr: GCC's SLP vectorization now correctly uses cached failure states for previously analyzed entries.
author: Richard Biener
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • optimization
• vectorization
• tree-optimization
• slp
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/19fae3c44356017e3f36626d9d57fe0081533fad
date: 2026-09-04T00:00:00.000Z

This commit ensures that GCC’s SLP (Superword Level Parallelism) vectorization pass properly utilizes cached failure information. When an entry has already been analyzed and determined to be unvectorizable, its failure state is now correctly reused, preventing redundant analysis and ensuring that previously identified unvectorizable code patterns are consistently handled.