internal static void forLoop(Instruction i, LuaVm vm)
{
var asBx = i.AsBx();
var a = asBx.Item1 + 1;
var sBx = asBx.Item2;
// R(A)+=R(A+2);
vm.PushValue(a + 2);
vm.PushValue(a);
vm.Arith(Consts.LUA_OPADD);
vm.Replace(a);
var isPositiveStep = vm.ToNumber(a + 2) >= 0;
if (
(isPositiveStep && vm.Compare(a, a + 1, Consts.LUA_OPLE)) ||
(!isPositiveStep && vm.Compare(a + 1, a, Consts.LUA_OPLE)))
{
// pc+=sBx; R(A+3)=R(A)
vm.AddPC(sBx);
vm.Copy(a, a + 3);
}
}
internal static void _compare(Instruction i, LuaVm vm, CompareOp op)
{
var abc = i.ABC();
var a = abc.Item1 + 1;
var b = abc.Item2 + 1;
var c = abc.Item3 + 1;
vm.GetRK(b);
vm.GetRK(c);
if (vm.Compare(-2, -1, op) != (a != 0))
{
vm.AddPC(1);
}
vm.Pop(2);
}