feat(arch): the SVE2.1 pairwise and quadword-reduction families

Assisted-by: GLM 5.3 Flash

asm/extension_test.go

@@ -273,7 +273,8 @@ func TestExtensionNamesARM64(t *testing.T) {
 		"ZZIP2",
 		"ZZIPQ1",
 		"ZZIPQ2",
-		// The stage-four families: the SVE2.1 narrowing two-to-one set.
+		// The stage-four families: the SVE2.1 narrowing two-to-one set, the
+		// pairwise forms and the quadword reductions.
 		"ZADDHNB",
 		"ZADDHNT",
 		"ZRADDHNB",
@@ -282,6 +283,21 @@ func TestExtensionNamesARM64(t *testing.T) {
 		"ZRSUBHNT",
 		"ZSUBHNB",
 		"ZSUBHNT",
+		"ZADDP",
+		"ZADDPT",
+		"ZADDQV",
+		"ZANDQV",
+		"ZEORQV",
+		"ZFADDQV",
+		"ZFMAXNMQV",
+		"ZFMAXQV",
+		"ZFMINNMQV",
+		"ZFMINQV",
+		"ZORQV",
+		"ZSMAXQV",
+		"ZSMINQV",
+		"ZUMAXQV",
+		"ZUMINQV",
 		// The stage-three families: the SVE2 crypto group, the predicate
 		// counters and loop terminators with the 32-bit while compares, and
 		// the reductions into a SIMD register.
@@ -394,7 +410,7 @@ 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 != 389 {
-		t.Errorf("the family registers %d instructions, want 389", n)
+	if n := len(arch.Extensions(arch.ARM64)); n != 405 {
+		t.Errorf("the family registers %d instructions, want 405", n)
 	}
 }