// ppc64x: -"ADDC", "ADDE", -"ADDZE"
	// s390x:"ADDE",-"ADDC\t[$]-1,"
	r[1], c = bits.Add64(p[1], q[1], c)
	r[2], c = bits.Add64(p[2], q[2], c)
}

func Add64M0(p, q, r *[3]uint64) {
	var c uint64
	r[0], c = bits.Add64(p[0], q[0], 0)
	// ppc64x: -"ADDC", -"ADDE", "ADDZE\tR[1-9]"
	r[1], c = bits.Add64(p[1], 0, c)
	// ppc64x: -"ADDC", "ADDE", -"ADDZE"
	r[2], c = bits.Add64(p[2], p[2], c)
}

	MULHDU	R5, R14, R11	// high x[i]*y
	ADDC	R15, R10
	ADDZE	R11
	ADDC	R9, R10
	ADDZE	R11, R9
	MULLD	R5, R16, R14	// low x[i+1]*y
	MULHDU	R5, R16, R15	// high x[i+1]*y
	ADDC	R17, R14
	ADDZE	R15
	ADDC	R9, R14
	ADDZE	R15, R9
	MULLD	R5, R18, R16    // low x[i+2]*y
	MULHDU	R5, R18, R17    // high x[i+2]*y
	ADDC	R19, R16
	ADDZE	R17
	ADDC	R9, R16
	ADDZE	R17, R9
	MULLD	R5, R20, R18    // low x[i+3]*y

		{name: "ADDZE", argLength: 2, reg: gp1xer1xer, asm: "ADDZE", typ: "(UInt64, UInt64)"},                  // arg0 + CA (arg1) -> out, CA
		{name: "SUBE", argLength: 3, reg: gp2xer1xer, asm: "SUBE", typ: "(UInt64, UInt64)"},                    // arg0 - arg1 - CA (arg2) -> out, CA
		{name: "ADDZEzero", argLength: 1, reg: xergp, asm: "ADDZE", typ: "UInt64"},                             // CA (arg0) + $0 -> out