feat(arch): the SVE2.1 last-active vector and compare families

Assisted-by: GLM 5.3 Flash

asm/arm64_ext_asm_test.go

@@ -876,7 +876,7 @@ func TestArm64AssembleExtensionStage4Refusals(t *testing.T) {
 		{"ZADDHNB Z22.D, Z10.D, Z8.H", "want .S"},
 		{"ZADDHNB Z22.Q, Z10.Q, Z8.D", "want .H, .S or .D"},
 		{"ZADDHNB Z22.S, Z10.S, Z8", "carries no arrangement suffix"},
-		{"ZADDP Z15.B, Z0.B, P3.Z, Z0.B", "merging qualifier"},
+		{"ZADDP Z15.B, Z0.B, P3.Z, Z0.B", "/M qualifier"},
 		{"ZADDPT Z7.S, Z6.S, Z23.S", "want .D"},
 		{"ZADDQV Z25.S, P9, V5.S4", "outside P0-P7"},
 		{"ZADDQV Z25.S, P3/M, V5.S4", "takes no qualifier"},

asm/extension_test.go

@@ -338,6 +338,14 @@ func TestExtensionNamesARM64(t *testing.T) {
 		"ZBFMLSLT",
 		"ZBFMMLA",
 		"ZBFSCALE",
+		"ZCLASTA",
+		"ZCLASTB",
+		"ZCMPEQ",
+		"ZCMPGE",
+		"ZCMPGT",
+		"ZCMPHI",
+		"ZCMPHS",
+		"ZCMPNE",
 		"ZLD2B",
 		"ZLD2D",
 		"ZLD2H",
@@ -480,7 +488,7 @@ func TestExtensionNamesARM64(t *testing.T) {
 	if strings.Join(got, ",") != strings.Join(want, ",") {
 		t.Errorf("ExtensionNames(ARM64) = %v, want %v", got, want)
 	}
-	if n := len(arch.Extensions(arch.ARM64)); n != 483 {
-		t.Errorf("the family registers %d instructions, want 483", n)
+	if n := len(arch.Extensions(arch.ARM64)); n != 497 {
+		t.Errorf("the family registers %d instructions, want 497", n)
 	}
 }