Landing: d458a4daa68c

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Project / Subsystem

gcc / gcc/tree-vect

Date

2026-07-30

Author

Richard Biener

Commit

d458a4daa68cdbaa869344ec1a75360a842ef19e

Source

github

Perf win

Breaking

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All attributes

project: gcc
subsystem: gcc/tree-vect
patch_id: —
commit_hash: d458a4daa68cdbaa869344ec1a75360a842ef19e
source_type: github
headline: Dump SLP subgraph entries upon costing
tldr: Added debugging output to SLP vectorization to show subgraph entries during cost analysis.
author: Richard Biener
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • debugging
• vectorization
• SLP
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/d458a4daa68cdbaa869344ec1a75360a842ef19e
date: 2026-07-30T00:00:00.000Z

To aid in debugging and understanding the cost analysis for SLP (Superword-Level Parallelism) vectorization, commit d458a4daa68cdbaa869344ec1a75360a842ef19e adds diagnostic dumping of SLP graph entries. This information is output when the vectorization profitability of a basic block is being calculated, providing developers with more insight into the internal workings of the vectorizer.