v := uint64(v64)
	vp := (v & -v) + v
	// Likewise, for the wrapping case.
	vn := ^v
	vpn := (vn & -vn) + vn
	return (v&vp == 0 || vn&vpn == 0) && v != 0
}

// Encode a doubleword rotate mask into mb (mask begin) and
// me (mask end, inclusive). Note, POWER ISA labels bits in
// big endian order.
func encodePPC64RLDCMask(mask int64) (mb, me int) {
	// Determine boundaries and then decode them

	{name: "PopCount16", argLength: 1}, // Count bits in arg[0]
	{name: "PopCount32", argLength: 1}, // Count bits in arg[0]
	{name: "PopCount64", argLength: 1}, // Count bits in arg[0]

	// RotateLeftX instructions rotate the X bits of arg[0] to the left
	// by the low lg_2(X) bits of arg[1], interpreted as an unsigned value.
	// Note that this works out regardless of the bit width or signedness of

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