feat(arch): add the amd64 fp16 packed conversion family

Assisted-by: GLM 5.3

asm/extension_amd64_test.go

@@ -41,6 +41,20 @@ func TestAmd64ExtensionRegistry(t *testing.T) {
 		{"VGETMANTSH", 1},
 		{"VREDUCESH", 1},
 		{"VRNDSCALESH", 1},
+		{"VCVTPH2W", 3},
+		{"VCVTPH2UW", 3},
+		{"VCVTW2PH", 3},
+		{"VCVTUW2PH", 3},
+		{"VCVTPH2DQ", 3},
+		{"VCVTPH2UDQ", 3},
+		{"VCVTDQ2PH", 3},
+		{"VCVTUDQ2PH", 3},
+		{"VCVTPH2QQ", 3},
+		{"VCVTPH2UQQ", 3},
+		{"VCVTQQ2PH", 3},
+		{"VCVTUQQ2PH", 3},
+		{"VCVTPH2PD", 3},
+		{"VCVTPD2PH", 3},
 	} {
 		cands, ok := LookupExtension(arch.AMD64, tt.mnem)
 		if !ok {
@@ -54,8 +68,8 @@ func TestAmd64ExtensionRegistry(t *testing.T) {
 			t.Errorf("the %s lookup is not case-insensitive", tt.mnem)
 		}
 	}
-	if got := arch.Extensions(arch.AMD64); len(got) != 70 {
-		t.Errorf("the amd64 layer registers %d instructions, want 70", len(got))
+	if got := arch.Extensions(arch.AMD64); len(got) != 112 {
+		t.Errorf("the amd64 layer registers %d instructions, want 112", len(got))
 	}
 	if _, ok := LookupExtension(arch.AMD64, "NOSUCHINSTR"); ok {
 		t.Error("a non-extended mnemonic resolved")
@@ -131,6 +145,21 @@ func TestEncodeExtensionAmd64(t *testing.T) {
 		{"scalar fp16 minimum with exceptions suppressed", "VMINSH",
 			[]arch.ExtOperand{arch.ExtXmm(5), arch.ExtXmm(4), arch.ExtRounded(arch.ExtXmm(6), arch.ExtRoundSAE)},
 			"62f556185df4"},
+		{"fp16 to signed words", "VCVTPH2W",
+			[]arch.ExtOperand{arch.ExtZmm(5), arch.ExtZmm(6)},
+			"62f57d487df5"},
+		{"dwords to fp16 over a broadcast source", "VCVTDQ2PH",
+			[]arch.ExtOperand{arch.ExtBroadcast(9, 0), arch.ExtYmm(30)},
+			"62457c585b31"},
+		{"fp16 to signed qwords, rounded", "VCVTPH2QQ",
+			[]arch.ExtOperand{arch.ExtXmm(5), arch.ExtRounded(arch.ExtZmm(6), arch.ExtRoundTruncate)},
+			"62f57d787bf5"},
+		{"fp16 scalar out of memory into an integer", "VCVTSH2SI",
+			[]arch.ExtOperand{arch.ExtMemory(9, 0), arch.ExtGpr64(12)},
+			"6255fe082d21"},
+		{"fp16 to double-precision, widened", "VCVTPH2PD",
+			[]arch.ExtOperand{arch.ExtXmm(5), arch.ExtZmm(6)},
+			"62f57c485af5"},
 	} {
 		got, err := EncodeExtension(arch.AMD64, tt.mnem, tt.ops...)
 		if err != nil {