MOVQ (8*0)(x_ptr), t0

	MOVQ (8*1)(x_ptr), AX
	MULQ t0
	MOVQ AX, acc1
	MOVQ DX, acc2

	MOVQ (8*2)(x_ptr), AX
	MULQ t0
	ADDQ AX, acc2
	ADCQ $0, DX
	MOVQ DX, acc3

	MOVQ (8*3)(x_ptr), AX
	MULQ t0
	ADDQ AX, acc3
	ADCQ $0, DX
	MOVQ DX, acc4
	// y[2:] * y[1]
	MOVQ (8*1)(x_ptr), t0

	MOVQ (8*2)(x_ptr), AX
	MULQ t0
	ADDQ AX, acc3
	ADCQ $0, DX
	MOVQ DX, t1

	// ppc64x:"SRAD"
	b := n2 / 64 // signed

	return a, b
}

// Check that constant divisions get turned into MULs
func ConstDivs(n1 uint, n2 int) (uint, int) {
	// amd64:"MOVQ\t[$]-1085102592571150095","MULQ",-"DIVQ"
	// 386:"MOVL\t[$]-252645135","MULL",-"DIVL"
	// arm64:`MOVD`,`UMULH`,-`DIV`
	// arm:`MOVW`,`MUL`,-`.*udiv`
	a := n1 / 17 // unsigned

	// amd64:"MOVQ\t[$]-1085102592571150095","IMULQ",-"IDIVQ"

//    bits.Mul*    //
// --------------- //

func Mul(x, y uint) (hi, lo uint) {
	// amd64:"MULQ"
	// arm64:"UMULH","MUL"
	// ppc64x:"MULHDU","MULLD"
	// s390x:"MLGR"
	// mips64: "MULVU"
	// riscv64:"MULHU","MUL"
	return bits.Mul(x, y)
}

func Mul64(x, y uint64) (hi, lo uint64) {
	// amd64:"MULQ"
	// arm64:"UMULH","MUL"
	// ppc64x:"MULHDU","MULLD"
	// s390x:"MLGR"
	// mips64: "MULVU"