feat(arch): add VMINMAXSH to the extension layer

Assisted-by: GLM 5.3 Flash

asm/extension_amd64_test.go

@@ -85,6 +85,7 @@ func TestAmd64ExtensionRegistry(t *testing.T) {
 		{"VFMADDCSH", 1},
 		{"VFCMADDCSH", 1},
 		{"VMINMAXPH", 3},
+		{"VMINMAXSH", 1},
 	} {
 		cands, ok := LookupExtension(arch.AMD64, tt.mnem)
 		if !ok {
@@ -98,8 +99,8 @@ func TestAmd64ExtensionRegistry(t *testing.T) {
 			t.Errorf("the %s lookup is not case-insensitive", tt.mnem)
 		}
 	}
-	if got := arch.Extensions(arch.AMD64); len(got) != 182 {
-		t.Errorf("the amd64 layer registers %d instructions, want 182", len(got))
+	if got := arch.Extensions(arch.AMD64); len(got) != 183 {
+		t.Errorf("the amd64 layer registers %d instructions, want 183", len(got))
 	}
 	if _, ok := LookupExtension(arch.AMD64, "NOSUCHINSTR"); ok {
 		t.Error("a non-extended mnemonic resolved")
@@ -217,6 +218,9 @@ func TestEncodeExtensionAmd64(t *testing.T) {
 		{"minimum or maximum under a control byte", "VMINMAXPH",
 			[]arch.ExtOperand{arch.ExtImmediate(0x88), arch.ExtZmm(29), arch.ExtMemory(9, 0), arch.ExtZmm(30)},
 			"62431440523188"},
+		{"scalar minimum or maximum out of memory", "VMINMAXSH",
+			[]arch.ExtOperand{arch.ExtImmediate(0x88), arch.ExtXmm(28), arch.ExtMemory(9, 0), arch.ExtXmm(29)},
+			"62431c00532988"},
 	} {
 		got, err := EncodeExtension(arch.AMD64, tt.mnem, tt.ops...)
 		if err != nil {