public static Tile RegReg()
{
// l = 0 -> first instruction sets reg to 0
// r = 0 but l > 0 -> fourth instruction sets reg to 0
// l > 0 and r > 0 -> first instruction sets reg = l > 0 and nothing changes
return(makeBinopTile <LogAndOperatorNode, RegisterNode, RegisterNode> (
(regNode, left, right) => new[] {
InstructionFactory.Move(regNode, left), // reg = left
InstructionFactory.Xor(left, left), // left = 0
InstructionFactory.Cmp(right, left), // if right == 0
InstructionFactory.Cmove(regNode, left) // then reg = 0
}
));
}