package z

import (
	"git.akyoto.dev/cli/q/src/build/asm"
	"git.akyoto.dev/cli/q/src/build/cpu"
)

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

	for _, general := range f.CPU.General {
		if register == general {
			return
		}
	}

	variable := f.VariableByRegister(register)

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

	newRegister := f.CurrentScope().MustFindFree(f.CPU.General)
	f.CurrentScope().Reserve(newRegister)
	f.RegisterRegister(asm.MOVE, newRegister, register)
	variable.Register = newRegister
}