// "VMOVQ r/m64, xmm1"/6E vs "VMOVQ xmm2/m64, xmm1"/7E with mem operand.
	VMOVQ (AX), X20           // 62e1fd086e20 or 62e1fe087e20
	VMOVQ 7(DX), X20          // 62e1fd086ea207000000 or 62e1fe087ea207000000
	VMOVQ -15(R11)(CX*1), X20 // 62c1fd086ea40bf1ffffff or 62c1fe087ea40bf1ffffff
	VMOVQ (SP)(AX*2), X20     // 62e1fd086e2444 or 62e1fe087e2444
	// "VMOVQ xmm1, r/m64"/7E vs "VMOVQ xmm1, xmm2/m64"/D6 with mem operand.

		return MemImmediate{Rn, AddrOffset, ((int32(imm7 << 3)) << 22) >> 22}

	case arg_Xns_mem_optional_imm9_1_signed:
		Rn := RegSP(X0) + RegSP(x>>5&(1<<5-1))
		imm9 := (x >> 12) & (1<<9 - 1)
		return MemImmediate{Rn, AddrOffset, (int32(imm9) << 23) >> 23}

	case arg_Xns_mem_post_imm7_4_signed:
		Rn := RegSP(X0) + RegSP(x>>5&(1<<5-1))
		imm7 := (x >> 15) & (1<<7 - 1)

#define V3_EXT_FEATURES_CX (V2_EXT_FEATURES_CX | 1 << 5)
                         // BMI1     AVX2     BMI2
#define V3_EXT_FEATURES_BX (1 << 3 | 1 << 5 | 1 << 8)
                       // XMM      YMM
#define V3_OS_SUPPORT_AX (1 << 1 | 1 << 2)

#define V4_FEATURES_CX V3_FEATURES_CX

#define V4_EXT_FEATURES_CX V3_EXT_FEATURES_CX