Landing: 0c7dc43c8de6

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Project / Subsystem

gcc / gcc

Date

2026-03-10

Author

Richard Biener

Commit

0c7dc43c8de6a42bcf581420fc75bf425faeff6e

Source

github

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Breaking

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project: gcc
subsystem: gcc
patch_id: —
commit_hash: 0c7dc43c8de6a42bcf581420fc75bf425faeff6e
source_type: github
headline: Add comment clarifying vectorization cost estimation.
tldr: A comment was added to GCC's vectorizer to explain the cost estimation of loop prologue and epilogue.
author: Richard Biener
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • vectorization
• optimization
• documentation
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/0c7dc43c8de6a42bcf581420fc75bf425faeff6e
date: 2026-03-10T00:00:00.000Z

This commit adds a comment to vect_estimate_min_profitable_iters in GCC’s vectorization pass. The comment explains the somewhat awkward method of estimating peeling costs by adding the scalar loop statement costs to the vector loop cost vector.