diff --git a/src/cmd/asm/internal/asm/testdata/loong64enc1.s b/src/cmd/asm/internal/asm/testdata/loong64enc1.s
index e16bd78fee..7aeb2920bd 100644
--- a/src/cmd/asm/internal/asm/testdata/loong64enc1.s
+++ b/src/cmd/asm/internal/asm/testdata/loong64enc1.s
@@ -278,3 +278,8 @@ lable2:
 	FMAXF	F4, F5			// a5900801
 	FMAXD	F4, F5, F6		// a6100901
 	FMAXD	F4, F5			// a5100901
+
+	FCOPYSGF	F4, F5, F6	// a6901201
+	FCOPYSGD	F4, F5, F6	// a6101301
+	FCLASSF		F4, F5		// 85341401
+	FCLASSD		F4, F5		// 85381401
diff --git a/src/cmd/internal/obj/loong64/a.out.go b/src/cmd/internal/obj/loong64/a.out.go
index e48160eaa2..878f148f15 100644
--- a/src/cmd/internal/obj/loong64/a.out.go
+++ b/src/cmd/internal/obj/loong64/a.out.go
@@ -446,6 +446,14 @@ const (
 	AFMAXF
 	AFMAXD
 
+	// 3.2.1.7
+	AFCOPYSGF
+	AFCOPYSGD
+
+	// 3.2.1.8
+	AFCLASSF
+	AFCLASSD
+
 	ALAST
 
 	// aliases
diff --git a/src/cmd/internal/obj/loong64/anames.go b/src/cmd/internal/obj/loong64/anames.go
index 42d9ea4d18..aac8ac92b8 100644
--- a/src/cmd/internal/obj/loong64/anames.go
+++ b/src/cmd/internal/obj/loong64/anames.go
@@ -183,5 +183,9 @@ var Anames = []string{
 	"FMIND",
 	"FMAXF",
 	"FMAXD",
+	"FCOPYSGF",
+	"FCOPYSGD",
+	"FCLASSF",
+	"FCLASSD",
 	"LAST",
 }
diff --git a/src/cmd/internal/obj/loong64/asm.go b/src/cmd/internal/obj/loong64/asm.go
index c0f9dee380..6ac02df988 100644
--- a/src/cmd/internal/obj/loong64/asm.go
+++ b/src/cmd/internal/obj/loong64/asm.go
@@ -1028,6 +1028,8 @@ func buildop(ctxt *obj.Link) {
 			opset(ATRUNCFW, r0)
 			opset(ASQRTF, r0)
 			opset(ASQRTD, r0)
+			opset(AFCLASSF, r0)
+			opset(AFCLASSD, r0)
 
 		case AMOVVF:
 			opset(AMOVVD, r0)
@@ -1056,6 +1058,8 @@ func buildop(ctxt *obj.Link) {
 			opset(AFMIND, r0)
 			opset(AFMAXF, r0)
 			opset(AFMAXD, r0)
+			opset(AFCOPYSGF, r0)
+			opset(AFCOPYSGD, r0)
 
 		case AAND:
 			opset(AOR, r0)
@@ -1884,6 +1888,10 @@ func (c *ctxt0) oprrr(a obj.As) uint32 {
 		return 0x211 << 15 // fmax.s
 	case AFMAXD:
 		return 0x212 << 15 // fmax.d
+	case AFCOPYSGF:
+		return 0x225 << 15 // fcopysign.s
+	case AFCOPYSGD:
+		return 0x226 << 15 // fcopysign.d
 	}
 
 	if a < 0 {
@@ -1952,6 +1960,10 @@ func (c *ctxt0) oprr(a obj.As) uint32 {
 		return 0x4511 << 10
 	case ASQRTD:
 		return 0x4512 << 10
+	case AFCLASSF:
+		return 0x450d << 10 // fclass.s
+	case AFCLASSD:
+		return 0x450e << 10 // fclass.d
 	}
 
 	c.ctxt.Diag("bad rr opcode %v", a)