func (s *regAllocState) setState(regs []endReg) {
	s.freeRegs(s.used)
	for _, x := range regs {
		s.assignReg(x.r, x.v, x.c)
	}
}

// compatRegs returns the set of registers which can store a type t.
func (s *regAllocState) compatRegs(t *types.Type) regMask {
	var m regMask
	if t.IsTuple() || t.IsFlags() {
		return 0
	}
	if t.IsFloat() || t == types.TypeInt128 {