VPGATHERQQ X0, 512(R12)(X1*1), X2       // c4c2f991940c00020000
	VPGATHERQQ X0, (BP)(X1*1), X2           // c4e2f991540d00
	VPGATHERQQ X0, 16(BP)(X1*1), X2         // c4e2f991540d10
	VPGATHERQQ X0, 512(BP)(X1*1), X2        // c4e2f991940d00020000
	VPGATHERQQ X0, (R13)(X1*1), X2          // c4c2f991540d00
	VPGATHERQQ X0, 16(R13)(X1*1), X2        // c4c2f991540d10
	VPGATHERQQ X0, 512(R13)(X1*1), X2       // c4c2f991940d00020000

	// "invalid VSIB address (missing vector index)"
	VPGATHERQQ Y2, (BP), Y1         // ERROR "invalid instruction"
	// AVX2GATHER mask/index/dest #UD cases.
	VPGATHERQQ Y2, (BP)(X2*2), Y2   // ERROR "mask, index, and destination registers should be distinct"
	VPGATHERQQ Y2, (BP)(X2*2), Y7   // ERROR "mask, index, and destination registers should be distinct"