diff --git a/src/cmd/asm/internal/asm/testdata/loong64enc1.s b/src/cmd/asm/internal/asm/testdata/loong64enc1.s
index 8d4231fa6c..45256beb7c 100644
--- a/src/cmd/asm/internal/asm/testdata/loong64enc1.s
+++ b/src/cmd/asm/internal/asm/testdata/loong64enc1.s
@@ -132,6 +132,11 @@ lable2:
 	BREAK				// 00002a00
 	UNDEF				// 00002a00
 
+	ANDN	R4, R5, R6		// a6901600
+	ANDN	R4, R5			// a5901600
+	ORN	R4, R5, R6		// a6101600
+	ORN	R4, R5			// a5101600
+
 	// mul
 	MUL	R4, R5	  		// a5101c00
 	MUL	R4, R5, R6	  	// a6101c00
diff --git a/src/cmd/internal/obj/loong64/a.out.go b/src/cmd/internal/obj/loong64/a.out.go
index 7c20df3b2d..60b0a62180 100644
--- a/src/cmd/internal/obj/loong64/a.out.go
+++ b/src/cmd/internal/obj/loong64/a.out.go
@@ -385,6 +385,10 @@ const (
 	AMOVVF
 	AMOVVD
 
+	// 2.2.1.8
+	AORN
+	AANDN
+
 	// 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 ed3d5b25ce..ddf13eec6e 100644
--- a/src/cmd/internal/obj/loong64/anames.go
+++ b/src/cmd/internal/obj/loong64/anames.go
@@ -127,6 +127,8 @@ var Anames = []string{
 	"MOVDV",
 	"MOVVF",
 	"MOVVD",
+	"ORN",
+	"ANDN",
 	"AMSWAPB",
 	"AMSWAPH",
 	"AMSWAPW",
diff --git a/src/cmd/internal/obj/loong64/asm.go b/src/cmd/internal/obj/loong64/asm.go
index 261e4a13c8..4e5bc15d33 100644
--- a/src/cmd/internal/obj/loong64/asm.go
+++ b/src/cmd/internal/obj/loong64/asm.go
@@ -1100,6 +1100,8 @@ func buildop(ctxt *obj.Link) {
 		case AAND:
 			opset(AOR, r0)
 			opset(AXOR, r0)
+			opset(AORN, r0)
+			opset(AANDN, r0)
 
 		case ABEQ:
 			opset(ABNE, r0)
@@ -1858,6 +1860,10 @@ func (c *ctxt0) oprrr(a obj.As) uint32 {
 		return 0x2a << 15
 	case AXOR:
 		return 0x2b << 15
+	case AORN:
+		return 0x2c << 15 // orn
+	case AANDN:
+		return 0x2d << 15 // andn
 	case ASUB:
 		return 0x22 << 15
 	case ASUBU, ANEGW: