[go] cmd/compile, runtime: use fine-grained FENCE instructions on riscv64

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Keith Randall (Gerrit)

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May 15, 2026, 12:14:30 PM (17 hours ago) May 15

to Boyao Wang, goph...@pubsubhelper.golang.org, golang-...@googlegroups.com, Dmitri Shuralyov, Dmitri Shuralyov, Meng Zhuo, golang...@luci-project-accounts.iam.gserviceaccount.com, Joel Sing, Mark Ryan, Pengcheng Wang, Keith Randall, Michael Knyszek, Martin Möhrmann, Gopher Robot, golang-co...@googlegroups.com

Keith Randall submitted the change

Change information

Commit message:

cmd/compile, runtime: use fine-grained FENCE instructions on riscv64

Make use of the newly supported FENCE operands on riscv64 to replace
overly conservative full memory barriers with more precise memory
ordering instructions.

Change-Id: I8e749eee4f2199cca218229e0cf51779fb6003b4

Reviewed-on: https://go-review.googlesource.com/c/go/+/758020

Reviewed-by: Meng Zhuo <mengzh...@gmail.com>

LUCI-TryBot-Result: golang...@luci-project-accounts.iam.gserviceaccount.com <golang...@luci-project-accounts.iam.gserviceaccount.com>

Reviewed-by: Keith Randall <k...@google.com>

Reviewed-by: Dmitri Shuralyov <dmit...@google.com>

Files:

M src/cmd/compile/internal/riscv64/ssa.go
M src/internal/runtime/atomic/atomic_riscv64.s
M src/runtime/atomic_riscv64.s
M src/runtime/sys_freebsd_riscv64.s
M src/runtime/sys_linux_riscv64.s

Change size: M

Delta: 5 files changed, 39 insertions(+), 15 deletions(-)

Branch: refs/heads/master

Submit Requirements:

Code-Review: +1 by Keith Randall, +1 by Dmitri Shuralyov, +2 by Meng Zhuo
TryBots-Pass: LUCI-TryBot-Result+1 by golang...@luci-project-accounts.iam.gserviceaccount.com

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