Landing: f06e56614b94

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Project / Subsystem

gcc / risc-v

Date

2026-07-10

Author

Jin Ma

Commit

f06e56614b948ad88dabf63020f47713b7dea0ec

Source

github

Perf win

Yes

Breaking

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All attributes

project: gcc
subsystem: risc-v
patch_id: —
commit_hash: f06e56614b948ad88dabf63020f47713b7dea0ec
source_type: github
headline: RISC-V: Remove scratch register from bitfield extract splitter.
tldr: RISC-V bitfield extraction optimized by removing an unnecessary scratch register, reducing pressure on register allocation.
author: Jin Ma
outcome: committed
performance_win: true
breaking_change: false
series_id: —
series_parts: []
tags: • risc-v
• optimization
• register allocation
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/f06e56614b948ad88dabf63020f47713b7dea0ec
date: 2026-07-10T00:00:00.000Z

The RISC-V backend of GCC has optimized the bitfield extract instruction splitter. By removing an unnecessary early-clobber scratch register, the intermediate shift-left operation can now directly use its destination register. This change simplifies the generated code and reduces register pressure.