Landing: 277e73c868a1

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Project / Subsystem

gcc / rx

Date

2026-05-18

Author

Yoshinori Sato

Commit

277e73c868a1e655629109e5651c3a81f6292f53

Source

github

Perf win

Breaking

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All attributes

project: gcc
subsystem: rx
patch_id: —
commit_hash: 277e73c868a1e655629109e5651c3a81f6292f53
source_type: github
headline: RX: Correct the size of mov instruction
tldr: This patch fixes incorrect code generation in the RX backend when expanding `extendqisi2` or `extendhisi2` operations.
author: Yoshinori Sato
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • gcc
• rx
• code generation
• bugfix
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/277e73c868a1e655629109e5651c3a81f6292f53
date: 2026-05-18T00:00:00.000Z

The RX backend was generating incorrect mov instruction sizes for certain code patterns, leading to incorrect output. This patch ensures the correct operation size is always selected for mov instructions, resolving the code generation issue. Optimization hid the bug, so it went unnoticed until now.