From 68a32ced0f7b1b9abf9fd948db53c668ef6b1c66 Mon Sep 17 00:00:00 2001
From: Junxian Zhu <zhujunxian@oss.cipunited.com>
Date: Wed, 12 Jul 2023 19:07:55 +0800
Subject: [PATCH] cmd/compile/internal/mips: use hardware NOP instruction as
 NOOP on mips platform

This CL uses mips hardware NOP instruction as NOOP on mips platform, instead of pseudo NOP "nor $zero,$zero,$zero".

Change-Id: I336e1ba4228b71e6bfc6be66b367a4327fb3b36e
Reviewed-on: https://go-review.googlesource.com/c/go/+/509015
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Joel Sing <joel@sing.id.au>
Run-TryBot: Joel Sing <joel@sing.id.au>
Reviewed-by: Keith Randall <khr@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
---
 src/cmd/compile/internal/mips/ggen.go   | 6 +-----
 src/cmd/compile/internal/mips64/ggen.go | 6 +-----
 2 files changed, 2 insertions(+), 10 deletions(-)

diff --git a/src/cmd/compile/internal/mips/ggen.go b/src/cmd/compile/internal/mips/ggen.go
index a18440e7b3c..e235ef95676 100644
--- a/src/cmd/compile/internal/mips/ggen.go
+++ b/src/cmd/compile/internal/mips/ggen.go
@@ -46,10 +46,6 @@ func zerorange(pp *objw.Progs, p *obj.Prog, off, cnt int64, _ *uint32) *obj.Prog
 }
 
 func ginsnop(pp *objw.Progs) *obj.Prog {
-	p := pp.Prog(mips.ANOR)
-	p.From.Type = obj.TYPE_REG
-	p.From.Reg = mips.REG_R0
-	p.To.Type = obj.TYPE_REG
-	p.To.Reg = mips.REG_R0
+	p := pp.Prog(mips.ANOOP)
 	return p
 }
diff --git a/src/cmd/compile/internal/mips64/ggen.go b/src/cmd/compile/internal/mips64/ggen.go
index 37bb871958b..5f3f3e64d9c 100644
--- a/src/cmd/compile/internal/mips64/ggen.go
+++ b/src/cmd/compile/internal/mips64/ggen.go
@@ -50,10 +50,6 @@ func zerorange(pp *objw.Progs, p *obj.Prog, off, cnt int64, _ *uint32) *obj.Prog
 }
 
 func ginsnop(pp *objw.Progs) *obj.Prog {
-	p := pp.Prog(mips.ANOR)
-	p.From.Type = obj.TYPE_REG
-	p.From.Reg = mips.REG_R0
-	p.To.Type = obj.TYPE_REG
-	p.To.Reg = mips.REG_R0
+	p := pp.Prog(mips.ANOOP)
 	return p
 }