Landing: b9cf6721ef0f

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Project / Subsystem

gcc / risc-v

Date

2026-05-20

Author

Zhongyao Chen

Commit

b9cf6721ef0f13cd27d399024931634f571e9186

Source

github

Perf win

Breaking

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All attributes

project: gcc
subsystem: risc-v
patch_id: —
commit_hash: b9cf6721ef0f13cd27d399024931634f571e9186
source_type: github
headline: RISC-V: Adds RVV main-loop overhead comparison in cost model
tldr: GCC now compares RISC-V RVV main-loop overhead in the cost model to favor loop elimination.
author: Zhongyao Chen
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • risc-v
• rvv
• vectorization
• cost model
• optimization
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/b9cf6721ef0f13cd27d399024931634f571e9186
date: 2026-05-20T00:00:00.000Z

This commit introduces a RISC-V RVV-specific loop-overhead comparison in the cost model. The compiler now prefers RVV mode that eliminates the main loop. This change helps the compiler to select the most efficient vectorization strategy for RISC-V architectures, potentially improving performance.