From: Xiaolin Zhao <zhaoxiaolin@loongson.cn>
Date: Tue, 18 Nov 2025 02:55:19 +0000 (+0800)
Subject: cmd/internal/obj/loong64: add MULW.D.W[U] instructions
X-Git-Tag: go1.26rc1~235
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=7f2ae21fb4;p=gostls13.git

cmd/internal/obj/loong64: add MULW.D.W[U] instructions

Go asm syntax:
	MULWVW		RK, RJ, RD
	MULWVWU		RK, RJ, RD

Equivalent platform assembler syntax:
	mulw.d.w	rd, rj, rk
	mulw.d.wu	rd, rj, rk

Change-Id: Ie46a21904a4c25d04200b0663f83072c38a76c6f
Reviewed-on: https://go-review.googlesource.com/c/go/+/721521
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: abner chenc <chenguoqi@loongson.cn>
Reviewed-by: Meidan Li <limeidan@loongson.cn>
Reviewed-by: Mark Freeman <markfreeman@google.com>
Reviewed-by: Keith Randall <khr@google.com>
---

diff --git a/src/cmd/asm/internal/asm/testdata/loong64enc1.s b/src/cmd/asm/internal/asm/testdata/loong64enc1.s
index c820a0a5a1..277396bf27 100644
--- a/src/cmd/asm/internal/asm/testdata/loong64enc1.s
+++ b/src/cmd/asm/internal/asm/testdata/loong64enc1.s
@@ -212,6 +212,12 @@ lable2:
 	SRLV	$32, R4, R5 		// 85804500
 	SRLV	$32, R4			// 84804500
 
+	// MULW.D.W[U] instructions
+	MULWVW	R4, R5			// a5101f00
+	MULWVW	R4, R5, R6		// a6101f00
+	MULWVWU	R4, R5			// a5901f00
+	MULWVWU	R4, R5, R6		// a6901f00
+
 	MASKEQZ	R4, R5, R6		// a6101300
 	MASKNEZ	R4, R5, R6		// a6901300
 
diff --git a/src/cmd/internal/obj/loong64/a.out.go b/src/cmd/internal/obj/loong64/a.out.go
index 73f145df14..5b8bffc9f1 100644
--- a/src/cmd/internal/obj/loong64/a.out.go
+++ b/src/cmd/internal/obj/loong64/a.out.go
@@ -589,6 +589,10 @@ const (
 	AORN
 	AANDN
 
+	// 2.2.1.12
+	AMULWVW
+	AMULWVWU
+
 	// 2.2.7. Atomic Memory Access Instructions
 	AAMSWAPB
 	AAMSWAPH
diff --git a/src/cmd/internal/obj/loong64/anames.go b/src/cmd/internal/obj/loong64/anames.go
index ab85c52a21..1749b43bf6 100644
--- a/src/cmd/internal/obj/loong64/anames.go
+++ b/src/cmd/internal/obj/loong64/anames.go
@@ -131,6 +131,8 @@ var Anames = []string{
 	"ALSLV",
 	"ORN",
 	"ANDN",
+	"MULWVW",
+	"MULWVWU",
 	"AMSWAPB",
 	"AMSWAPH",
 	"AMSWAPW",
diff --git a/src/cmd/internal/obj/loong64/asm.go b/src/cmd/internal/obj/loong64/asm.go
index 38b075d77e..b35e49a1b6 100644
--- a/src/cmd/internal/obj/loong64/asm.go
+++ b/src/cmd/internal/obj/loong64/asm.go
@@ -1503,6 +1503,8 @@ func buildop(ctxt *obj.Link) {
 			opset(AREMU, r0)
 			opset(ADIV, r0)
 			opset(ADIVU, r0)
+			opset(AMULWVW, r0)
+			opset(AMULWVWU, r0)
 
 		case AMULV:
 			opset(AMULVU, r0)
@@ -3230,6 +3232,10 @@ func (c *ctxt0) oprrr(a obj.As) uint32 {
 		return 0x3c << 15 // mulh.d
 	case AMULHVU:
 		return 0x3d << 15 // mulhu.d
+	case AMULWVW:
+		return 0x3e << 15 // mulw.d.w
+	case AMULWVWU:
+		return 0x3f << 15 // mulw.d.wu
 	case ADIV:
 		return 0x40 << 15 // div.w
 	case ADIVU: