Landing: 2b2e5f661dcb

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Project / Subsystem

gcc / sh

Date

2026-06-23

Author

Kaz Kojima

Commit

2b2e5f661dcbea7136229494148c8e0897496613

Source

github

Perf win

Breaking

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All attributes

project: gcc
subsystem: sh
patch_id: —
commit_hash: 2b2e5f661dcbea7136229494148c8e0897496613
source_type: github
headline: SH: Adjust fp-reg move insns for LRA compatibility
tldr: SH backend modifies floating-point move instructions to better integrate with the LRA register allocator.
author: Kaz Kojima
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • sh
• register allocation
• floating-point
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/2b2e5f661dcbea7136229494148c8e0897496613
date: 2026-06-23T00:00:00.000Z

The SH backend adjusts floating-point move instructions to accommodate the Long-Range Addresser (LRA) register allocator. Modifications include splitting the movsf_ie_ra instruction, introducing new sub-patterns for movdf constant loads, and creating a movsf_ie_rffr pattern. These changes aim to remove match_scratch constraints that LRA struggles with, improving its reliability for floating-point operations.