VPGATHERDQ (BP)(Y20*2), K1, Z20 // ERROR "index and destination registers should be distinct"
	// Instructions without EVEX variant can't use High-16 registers.
	VADDSUBPD X20, X1, X2           // ERROR "invalid instruction"
	VADDSUBPS X0, X20, X2           // ERROR "invalid instruction"
	// Use of K0 for write mask (Yknot0).
	// TODO(quasilyte): improve error message (#21860).