Landing: faf5c056ca18

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Project / Subsystem

gcc / tree-optimization

Date

2026-09-15

Author

Richard Biener

Commit

faf5c056ca1826cffb5673fa3b445eb61a6bb7eb

Source

github

Perf win

Breaking

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All attributes

project: gcc
subsystem: tree-optimization
patch_id: —
commit_hash: faf5c056ca1826cffb5673fa3b445eb61a6bb7eb
source_type: github
headline: Vectorization rejects bit-precision integer comparisons
tldr: Vectorizer now correctly rejects comparisons of _BitInt types, requiring bitfield lowering.
author: Richard Biener
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • vectorization
• optimization
• _BitInt
• bugfix
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/faf5c056ca1826cffb5673fa3b445eb61a6bb7eb
date: 2026-09-15T00:00:00.000Z

The GCC vectorizer previously failed to reject attempts to vectorize comparisons involving non-mode precision integer types, such as _BitInt. This commit modifies vectorizable_comparison_1 to reject such comparisons, ensuring they are handled by bitfield lowering in ifcvt or through pattern recognition, addressing PR tree-optimization/127390.