diff --git a/asm/extension_amd64_test.go b/asm/extension_amd64_test.go
index a058b46..3ed7b46 100644
--- a/asm/extension_amd64_test.go
+++ b/asm/extension_amd64_test.go
@@ -189,6 +189,21 @@ func TestEncodeExtensionAmd64(t *testing.T) {
 		{"packed fp16 rounding to fraction bits", "VRNDSCALEPH",
 			[]arch.ExtOperand{arch.ExtImmediate(0x7b), arch.ExtZmm(5), arch.ExtZmm(6)},
 			"62f37c4808f57b"},
+		{"packed fused multiply-add, high registers", "VFMADD132PH",
+			[]arch.ExtOperand{arch.ExtZmm(29), arch.ExtZmm(28), arch.ExtZmm(30)},
+			"6206154098f4"},
+		{"fused multiply-add out of a broadcast source", "VFMADD231PH",
+			[]arch.ExtOperand{arch.ExtYmm(5), arch.ExtBroadcast(1, 0), arch.ExtYmm(6)},
+			"62f65538b831"},
+		{"scalar multiply-subtract under embedded rounding", "VFMSUB231SH",
+			[]arch.ExtOperand{arch.ExtXmm(5), arch.ExtXmm(4), arch.ExtRounded(arch.ExtXmm(6), arch.ExtRoundTruncate)},
+			"62f65578bbf4"},
+		{"complex multiply, conjugating the first source", "VFCMULCPH",
+			[]arch.ExtOperand{arch.ExtZmm(29), arch.ExtZmm(28), arch.ExtZmm(30)},
+			"62061740d6f4"},
+		{"minimum or maximum under a control byte", "VMINMAXPH",
+			[]arch.ExtOperand{arch.ExtImmediate(0x88), arch.ExtZmm(29), arch.ExtMemory(9, 0), arch.ExtZmm(30)},
+			"62431440523188"},
 	} {
 		got, err := EncodeExtension(arch.AMD64, tt.mnem, tt.ops...)
 		if err != nil {