Landing: ef039a5bf888

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Project / Subsystem

gcc / gcc

Date

2026-04-29

Author

Vladimir N. Makarov

Commit

ef039a5bf888f736eb4504fe1322b8c1d5523dea

Source

github

Perf win

Breaking

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All attributes

project: gcc
subsystem: gcc
patch_id: —
commit_hash: ef039a5bf888f736eb4504fe1322b8c1d5523dea
source_type: github
headline: Fix a bug in updating live info during rematerialization.
tldr: The compiler's register allocation phase now correctly handles multi-register pseudo-registers during 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/ef039a5bf888f736eb4504fe1322b8c1d5523dea
date: 2026-04-29T00:00:00.000Z

A bug was fixed in the LRA (Local Register Allocator) rematerialization pass where it failed to account for pseudo-registers requiring multiple hardware registers. This could lead to incorrect rematerialization decisions, but is now corrected to consider the correct number of registers.