public static Tile Dec_Reg()
{
return(makeUnopTile <DecOperatorNode, RegisterNode> (
(regNode, root, left) => new [] {
InstructionFactory.Dec(left),
InstructionFactory.Move(regNode, left)
}
));
}
// reg1 = reg2 - const
public static Tile Reg_SubConst()
{
return(new Tile(typeof(AssignmentNode),
new[] {
makeTile <RegisterNode> (),
makeTile <SubOperatorNode> (
makeTile <RegisterNode> (),
makeTile <ConstantNode <long> > ()
)
},
(regNode, node) => {
var root = node as AssignmentNode;
var reg1 = root.Target as RegisterNode;
var subop = root.Source as SubOperatorNode;
var reg2 = subop.LeftOperand as RegisterNode;
var val = subop.RightOperand as ConstantNode <long>;
// reg = reg - 1 -> reg--
if (reg1 == reg2 && val.Value == 1L)
{
return new[] {
InstructionFactory.Dec(reg1),
InstructionFactory.Move(regNode, reg1)
};
}
else
{
return new[] {
InstructionFactory.Move(reg1, reg2), // r = left
InstructionFactory.Sub(reg1, val), // r = left - right
InstructionFactory.Move(regNode, reg1)
};
}
}
));
}