return 1
}

func copyU32Arr(src, dest []uint32) int {
	if len(dest) < len(src) {
		return 0
	}
	for i, v := range src {
		dest[i] = v
	}
	return len(src)
}

func copyU64(val uint64, dest []uint64) int {
	if len(dest) < 1 {
		return 0
	}
	dest[0] = val
	return 1

	STP	(R12, R13), -16(R5)
	RET

	// Copy 65..128 bytes.
copy128:
	LDP	32(R1), (R14, R15)
	LDP	48(R1), (R16, R17)
	CMP	$96, R2
	BLS	copy96
	LDP	-64(R4), (R2, R3)
	LDP	-48(R4), (R1, R4)
	STP	(R2, R3), -64(R5)
	STP	(R1, R4), -48(R5)

copy96:
	STP	(R6, R7), (R0)
	STP	(R8, R9), 16(R0)
	STP	(R14, R15), 32(R0)
	STP	(R16, R17), 48(R0)
	STP	(R10, R11), -32(R5)
	STP	(R12, R13), -16(R5)
	RET

	vwPreIter(ADDS, ADCS, R10, add4)
	SUB	$4, R0
add4:
	BCC	copy
	vwOneIter(ADCS, R0, len1)
	B	add4
copy:
	MOVD	ZR, c+56(FP)
	CMP	R1, R3
	BEQ	done
copy_4:				// no carry flag, copy the rest
	vwOneIterCopy(R0, done)
	B	copy_4

// func subVW(z, x []Word, y Word) (c Word)
// The 'large' branch handles large 'z'. It checks the carry flag on every iteration