Landing: d1b4bf7c25ca

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Project / Subsystem

gcc / match

Date

2026-09-19

Author

Andrea Pinski

Commit

d1b4bf7c25ca1a57bb438b91439c0484eb73ac64

Source

github

Perf win

Yes

Breaking

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All attributes

project: gcc
subsystem: match
patch_id: —
commit_hash: d1b4bf7c25ca1a57bb438b91439c0484eb73ac64
source_type: github
headline: Remove redundant comparison check in vec_cond pattern
tldr: Simplifies a pattern matching a conditional vector expression by removing an unnecessary comparison.
author: Andrea Pinski
outcome: committed
performance_win: true
breaking_change: false
series_id: —
series_parts: []
tags: • optimization
• pattern-matching
• codegen
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/d1b4bf7c25ca1a57bb438b91439c0484eb73ac64
date: 2026-09-19T00:00:00.000Z

A pattern in the match.pd file used for matching conditional vector expressions has been simplified. The inner comparison within the VCE (Vector Conditional Expression) construct was found to be redundant for the purpose of VEC_COND matching and has been removed. This change may lead to slightly more optimized generated code by genmatch and could potentially improve matching for certain bitwise operations.