From 08b9640333af248316e168d5a8d3331200fec9e9 Mon Sep 17 00:00:00 2001
From: WANG Xuerui <git@xen0n.name>
Date: Tue, 13 Dec 2022 16:51:02 +0800
Subject: [PATCH] cmd/compile: teach regalloc to rightly do nothing on loong64
 in case of dynlinking

This is needed before actual support for buildmode=plugin is added.
Should not affect current behavior.

Change-Id: I86371d7e373fd529cb8710850d7b0fbbf1eb52ca
Reviewed-on: https://go-review.googlesource.com/c/go/+/480877
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Meidan Li <limeidan@loongson.cn>
Reviewed-by: abner chenc <chenguoqi@loongson.cn>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Run-TryBot: WANG Xuerui <git@xen0n.name>
TryBot-Result: Gopher Robot <gobot@golang.org>
---
 src/cmd/compile/internal/ssa/regalloc.go | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/cmd/compile/internal/ssa/regalloc.go b/src/cmd/compile/internal/ssa/regalloc.go
index fcd3f5c8b5..2325b9ee45 100644
--- a/src/cmd/compile/internal/ssa/regalloc.go
+++ b/src/cmd/compile/internal/ssa/regalloc.go
@@ -672,6 +672,8 @@ func (s *regAllocState) init(f *Func) {
 			s.allocatable &^= 1 << 9 // R9
 		case "arm64":
 			// nothing to do
+		case "loong64": // R2 (aka TP) already reserved.
+			// nothing to do
 		case "ppc64le": // R2 already reserved.
 			// nothing to do
 		case "riscv64": // X3 (aka GP) and X4 (aka TP) already reserved.