Go: RISC-V Assembly Enhancement

Mark Ryan added support for RISC-V pseudo CSR operations to Go's assembler and compiler toolchain. The enhancement includes seven new pseudo operations and comprehensive test coverage for RVV CSR register encoding.

Duration: PT1M52S

Episode overview

This episode is a short developer briefing from Go.

It explains recent repository work in plain language.

  • Show: Go
  • Published: 2026-04-26T00:00:00Z
  • Audio duration: PT1M52S

Transcript excerpt

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Good morning, this is your Go development briefing for Monday, April 26th, 2026.

Today's activity centers on a significant enhancement to Go's RISC-V 64-bit architecture support. Mark Ryan committed changes that add support for RISC-V pseudo CSR operations to the assembler and internal object code generator.

The commit introduces seven pseudo CSR operations: CSRR for reading control and status registers, CSRW for writing, CSRS and CSRC for setting and clearing bits, and their immediate variants CSRWI, CSRSI, and CSRCI. These operations provide developers with standardized ways to interact with RISC-V control and status…

The implementation spans multiple components of Go's toolchain. Changes were made to the RISC-V assembler architecture definitions, the main assembler logic, and the RISC-V object code generator. Ryan also added comprehensive test coverage, including verification that the assembler can correctly encode CSRR…

This enhancement received review from three Go team members - Meng Zhuo, Carlos Amedee, and Mark Freeman - and passed the LUCI continuous integration system, indicating thorough validation of the changes.

What's next: This enhancement should improve Go's support…

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