Landing: d55b88505c7e

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Project / Subsystem

gcc / i386

Date

2026-08-06

Author

Uros Bizjak

Commit

d55b88505c7eace3b5476d021af52b996407cae3

Source

github

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Breaking

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All attributes

project: gcc
subsystem: i386
patch_id: —
commit_hash: d55b88505c7eace3b5476d021af52b996407cae3
source_type: github
headline: Use %w operand modifier for ROLW bswaphisi2_lowpart alternative.
tldr: Fixes incorrect operand size handling for ROLW instruction on i386.
author: Uros Bizjak
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • i386
• code generation
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/d55b88505c7eace3b5476d021af52b996407cae3
date: 2026-08-06T00:00:00.000Z

This change corrects an issue on the i386 architecture where the bswaphisi2_lowpart alternative for the ROLW instruction was not using the correct operand size modifier. By introducing the %w operand modifier, the compiler now correctly emits a HImode register name, resolving a bug reported in PR126685.