Landing: 53e0c6b96561

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Project / Subsystem

gcc / gcc/tree-vect

Date

2026-03-03

Author

Richard Biener

Commit

53e0c6b96561c4f2f7fc7831793c4ad8bd4db0f7

Source

github

Perf win

Yes

Breaking

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All attributes

project: gcc
subsystem: gcc/tree-vect
patch_id: —
commit_hash: 53e0c6b96561c4f2f7fc7831793c4ad8bd4db0f7
source_type: github
headline: Compute Full Scalar Statement Coverage During Vectorization
tldr: The compiler now computes full scalar statement coverage during basic block vectorization for simpler and more precise live lane determination and scalar costi…
author: Richard Biener
outcome: committed
performance_win: true
breaking_change: false
series_id: —
series_parts: []
tags: • optimization
• vectorization
• SLP
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/53e0c6b96561c4f2f7fc7831793c4ad8bd4db0f7
date: 2026-03-03T00:00:00.000Z

This commit re-purposes STMT_SLP_TYPE to indicate the scalar statement coverage of the vectorized SLP graph in basic block vectorization. This allows for simpler and more precise determination of live lanes and scalar costing, potentially improving the efficiency of vectorized code.