Landing: 7b350a051058

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Project / Subsystem

gcc / avr

Date

2026-07-08

Author

Georg-Johann Lay

Commit

7b350a051058e95bb2640469bd040daab671f26c

Source

github

Perf win

Breaking

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All attributes

project: gcc
subsystem: avr
patch_id: —
commit_hash: 7b350a051058e95bb2640469bd040daab671f26c
source_type: github
headline: AVR: Add R18:SI = neg R18:SI to libgcc.
tldr: AVR libgcc gains a factored-out negation function for R18:SI and a conditional call macro.
author: Georg-Johann Lay
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • avr
• libgcc
• optimization
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/7b350a051058e95bb2640469bd040daab671f26c
date: 2026-07-08T00:00:00.000Z

The AVR version of libgcc now includes a new function, _negsi2_r18, which factors out common code for negating the R18:SI register. Additionally, a new macro, .call_if_neg, is introduced to conditionally call a label based on a register’s value. These changes improve code reuse and convenience in libgcc’s AVR implementation.