// freeRegs frees up all registers listed in m.
func (s *regAllocState) freeRegs(m regMask) {
	for m&s.used != 0 {
		s.freeReg(pickReg(m & s.used))
	}
}

// clobberRegs inserts instructions that clobber registers listed in m.
func (s *regAllocState) clobberRegs(m regMask) {
	m &= s.allocatable & s.f.Config.gpRegMask // only integer register can contain pointers, only clobber them
	for m != 0 {
		r := pickReg(m)
		m &^= 1 << r

	// Clobber experiment op
	{name: "Clobber", argLength: 0, typ: "Void", aux: "SymOff", symEffect: "None"}, // write an invalid pointer value to the given pointer slot of a stack variable
	{name: "ClobberReg", argLength: 0, typ: "Void"},                                // clobber a register

	// Prefetch instruction

		generic:        true,
	},
	{
		name:      "Clobber",
		auxType:   auxSymOff,
		argLen:    0,
		symEffect: SymNone,
		generic:   true,
	},
	{
		name:    "ClobberReg",
		argLen:  0,
		generic: true,
	},
	{
		name:           "PrefetchCache",
		argLen:         2,
		hasSideEffects: true,
		generic:        true,
	},
	{