Landing: a924d879f01d

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Project / Subsystem

gcc / risc-v

Date

2026-09-25

Author

Robin Dapp

Commit

a924d879f01d00d6c29e870c51bebcbf5e5a96eb

Source

github

Perf win

Yes

Breaking

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All attributes

project: gcc
subsystem: risc-v
patch_id: —
commit_hash: a924d879f01d00d6c29e870c51bebcbf5e5a96eb
source_type: github
headline: RISC-V: Consider spills in conv-dynamic LMUL for vector operations.
tldr: RISC-V vector code generation now considers spills when determining LMUL for conv-dynamic mode.
author: Robin Dapp
outcome: committed
performance_win: true
breaking_change: false
series_id: —
series_parts: []
tags: • risc-v
• vectorization
• optimization
• performance
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/a924d879f01d00d6c29e870c51bebcbf5e5a96eb
date: 2026-09-25T00:00:00.000Z

The RISC-V vector code generation, specifically for the -mrvv-max-lmul=conv-dynamic option, now accounts for potential data spills. Previously, this mode solely relied on the size ratio of the largest and smallest types, sometimes leading to unexpected spills in applications like x264. This change integrates spill estimation into the ‘conv-dynamic’ mode and refactors related logic for clarity.