From 96a10b9c8469110a0aa30ea2185ca55f4aefef99 Mon Sep 17 00:00:00 2001
From: Xiaodong Liu <liuxiaodong@loongson.cn>
Date: Thu, 19 May 2022 20:01:10 +0800
Subject: [PATCH] runtime: implement duffzero/duffcopy for linux/loong64

Contributors to the loong64 port are:
  Weining Lu <luweining@loongson.cn>
  Lei Wang <wanglei@loongson.cn>
  Lingqin Gong <gonglingqin@loongson.cn>
  Xiaolin Zhao <zhaoxiaolin@loongson.cn>
  Meidan Li <limeidan@loongson.cn>
  Xiaojuan Zhai <zhaixiaojuan@loongson.cn>
  Qiyuan Pu <puqiyuan@loongson.cn>
  Guoqi Chen <chenguoqi@loongson.cn>

This port has been updated to Go 1.15.6:
  https://github.com/loongson/go

Updates #46229

Change-Id: Ida040e76dc8172f60e6aee1ea2b5bce13ab3581e
Reviewed-on: https://go-review.googlesource.com/c/go/+/368077
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Auto-Submit: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
---
 src/runtime/duff_loong64.s | 907 +++++++++++++++++++++++++++++++++++++
 src/runtime/mkduff.go      |  25 +
 2 files changed, 932 insertions(+)
 create mode 100644 src/runtime/duff_loong64.s

diff --git a/src/runtime/duff_loong64.s b/src/runtime/duff_loong64.s
new file mode 100644
index 00000000000..7f78e4fa9f1
--- /dev/null
+++ b/src/runtime/duff_loong64.s
@@ -0,0 +1,907 @@
+// Code generated by mkduff.go; DO NOT EDIT.
+// Run go generate from src/runtime to update.
+// See mkduff.go for comments.
+
+#include "textflag.h"
+
+TEXT runtime·duffzero(SB), NOSPLIT|NOFRAME, $0-0
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	MOVV	R0, 8(R19)
+	ADDV	$8, R19
+	RET
+
+TEXT runtime·duffcopy(SB), NOSPLIT|NOFRAME, $0-0
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	MOVV	(R19), R30
+	ADDV	$8, R19
+	MOVV	R30, (R20)
+	ADDV	$8, R20
+
+	RET
diff --git a/src/runtime/mkduff.go b/src/runtime/mkduff.go
index f1e4ed75d0b..6b42b8524b4 100644
--- a/src/runtime/mkduff.go
+++ b/src/runtime/mkduff.go
@@ -36,6 +36,7 @@ func main() {
 	gen("386", notags, zero386, copy386)
 	gen("arm", notags, zeroARM, copyARM)
 	gen("arm64", notags, zeroARM64, copyARM64)
+	gen("loong64", notags, zeroLOONG64, copyLOONG64)
 	gen("ppc64x", tagsPPC64x, zeroPPC64x, copyPPC64x)
 	gen("mips64x", tagsMIPS64x, zeroMIPS64x, copyMIPS64x)
 	gen("riscv64", notags, zeroRISCV64, copyRISCV64)
@@ -176,6 +177,30 @@ func copyARM64(w io.Writer) {
 	fmt.Fprintln(w, "\tRET")
 }
 
+func zeroLOONG64(w io.Writer) {
+	// R0: always zero
+	// R19 (aka REGRT1): ptr to memory to be zeroed - 8
+	// On return, R19 points to the last zeroed dword.
+	fmt.Fprintln(w, "TEXT runtime·duffzero(SB), NOSPLIT|NOFRAME, $0-0")
+	for i := 0; i < 128; i++ {
+		fmt.Fprintln(w, "\tMOVV\tR0, 8(R19)")
+		fmt.Fprintln(w, "\tADDV\t$8, R19")
+	}
+	fmt.Fprintln(w, "\tRET")
+}
+
+func copyLOONG64(w io.Writer) {
+	fmt.Fprintln(w, "TEXT runtime·duffcopy(SB), NOSPLIT|NOFRAME, $0-0")
+	for i := 0; i < 128; i++ {
+		fmt.Fprintln(w, "\tMOVV\t(R19), R30")
+		fmt.Fprintln(w, "\tADDV\t$8, R19")
+		fmt.Fprintln(w, "\tMOVV\tR30, (R20)")
+		fmt.Fprintln(w, "\tADDV\t$8, R20")
+		fmt.Fprintln(w)
+	}
+	fmt.Fprintln(w, "\tRET")
+}
+
 func tagsPPC64x(w io.Writer) {
 	fmt.Fprintln(w)
 	fmt.Fprintln(w, "//go:build ppc64 || ppc64le")