Landing: 03750b3b6c39

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Project / Subsystem

gcc / avr

Date

2026-07-21

Author

Georg-Johann Lay

Commit

03750b3b6c39cf918e549d6c24840205550dd028

Source

github

Perf win

Yes

Breaking

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All attributes

project: gcc
subsystem: avr
patch_id: —
commit_hash: 03750b3b6c39cf918e549d6c24840205550dd028
source_type: github
headline: AVR: Optimize __muldi3_6 for faster execution.
tldr: AVR libgcc function __muldi3_6 optimized for a one-cycle speedup in common cases.
author: Georg-Johann Lay
outcome: committed
performance_win: true
breaking_change: false
series_id: —
series_parts: []
tags: • avr
• optimization
• libgcc
• performance
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/03750b3b6c39cf918e549d6c24840205550dd028
date: 2026-07-21T00:00:00.000Z

The AVR libgcc function __muldi3_6 has been optimized to save one CPU cycle. This is achieved by altering the sequence of operations, specifically in cases where a conditional branch is not taken, resulting in a net performance improvement for 64-bit multiplication operations on AVR microcontrollers.