Landing: e7dcba030640

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Project / Subsystem

gcc / aarch64

Date

2026-05-11

Author

Tamar Christina

Commit

e7dcba03064011c65f3a87c1e89bdd281909b279

Source

github

Perf win

Yes

Breaking

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All attributes

project: gcc
subsystem: aarch64
patch_id: —
commit_hash: e7dcba03064011c65f3a87c1e89bdd281909b279
source_type: github
headline: AArch64: Turn on GPR narrowing pass by default
tldr: The GPR narrowing pass is now enabled by default for all AArch64 targets, optimizing code by using smaller register sizes where possible.
author: Tamar Christina
outcome: committed
performance_win: true
breaking_change: false
series_id: —
series_parts: []
tags: • aarch64
• optimization
• register allocation
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/e7dcba03064011c65f3a87c1e89bdd281909b279
date: 2026-05-11T00:00:00.000Z

This commit enables the GPR (General Purpose Register) narrowing pass by default for all AArch64 targets. The GPR narrowing pass attempts to use smaller register sizes (e.g., 32-bit registers instead of 64-bit registers) when possible, which can improve code density and performance, especially on memory-constrained systems.