package register

import (
	"slices"

	"git.urbach.dev/cli/q/src/asm"
	"git.urbach.dev/cli/q/src/cpu"
)

// SaveRegister attempts to move a variable occupying this register to another register.
func (f *Machine) SaveRegister(register cpu.Register) {
	if !f.RegisterIsUsed(register) {
		return
	}

	if slices.Contains(f.CPU.General, register) {
		return
	}

	variable := f.VariableByRegister(register)

	if variable == nil || variable.Value.Alive == 0 {
		return
	}

	newRegister := f.NewRegister()
	f.RegisterRegister(asm.MOVE, newRegister, register)
	variable.Value.Register = newRegister
	f.FreeRegister(register)
}