Landing: 65b50ebf4bbd

← All landings

Project / Subsystem

gcc / avr

Date

2026-07-22

Author

Georg-Johann Lay

Commit

65b50ebf4bbdf39388cd83030d9441111663604b

Source

github

Perf win

Breaking

View on GitHub →

All attributes

project: gcc
subsystem: avr
patch_id: —
commit_hash: 65b50ebf4bbdf39388cd83030d9441111663604b
source_type: github
headline: AVR: Tweak lib1funcs-fixed.S::__mulQ64_work
tldr: AVR libgcc multiplication routine refined for signed overflow handling.
author: Georg-Johann Lay
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • avr
• libgcc
• multiplication
• signed overflow
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/65b50ebf4bbdf39388cd83030d9441111663604b
date: 2026-07-22T00:00:00.000Z

The __mulQ64_work function in GCC’s libgcc for the AVR target has been updated to refine its signed overflow handling. The patch now uses __negsi2 (non-saturating negation) for negation. Additionally, a misnamed file fx24-mul.c has been renamed to fx64-mul-1.c, and more test cases have been added to fx64-mul-2.c.