Landing: fb3b31e0cbdd

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Project / Subsystem

gcc / gcc

Date

2026-04-29

Author

Vladimir N. Makarov

Commit

fb3b31e0cbdd779b3687b25334aa6a3766aec3f3

Source

github

Perf win

Breaking

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All attributes

project: gcc
subsystem: gcc
patch_id: —
commit_hash: fb3b31e0cbdd779b3687b25334aa6a3766aec3f3
source_type: github
headline: Fix a bug in finding conflicts during rematerialization.
tldr: The LRA rematerialization pass now uses the correct mode when identifying register conflicts, preventing incorrect rematerialization.
author: Vladimir N. Makarov
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • lra
• register allocation
• rematerialization
• bugfix
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/fb3b31e0cbdd779b3687b25334aa6a3766aec3f3
date: 2026-04-29T00:00:00.000Z

A bug was corrected in the LRA rematerialization pass where the wrong mode was used when searching for register conflicts, which could lead to incorrect rematerialization. The fix ensures the correct mode is used to find conflicts.