Landing: 33495b439916

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Project / Subsystem

gcc / gcc

Date

2026-08-27

Author

Richard Biener

Commit

33495b439916fe799492c7b80873f1f69fbe091f

Source

github

Perf win

Breaking

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All attributes

project: gcc
subsystem: gcc
patch_id: —
commit_hash: 33495b439916fe799492c7b80873f1f69fbe091f
source_type: github
headline: Remove -ftree-loop-if-convert and tie if-conversion to vectorization
tldr: GCC removes the standalone -ftree-loop-if-convert option, dedicating if-conversion to loop vectorization.
author: Richard Biener
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • gcc
• optimization
• vectorization
• compiler
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/33495b439916fe799492c7b80873f1f69fbe091f
date: 2026-08-27T00:00:00.000Z

The GCC compiler has removed the -ftree-loop-if-convert option, which previously allowed standalone loop if-conversion. This change simplifies the compiler by tying if-conversion directly to the vectorizer’s loop vectorization pass, as other if-conversion mechanisms (phiopt and cselimg) are considered more general. This aims to improve integration with the vectorizer and eliminate under-tested functionality.