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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
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 * 2 along with this work; if not, write to the Free Software Foundation,
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package org.graalvm.compiler.core.aarch64;

import org.graalvm.compiler.asm.aarch64.AArch64MacroAssembler;
import org.graalvm.compiler.core.gen.NodeMatchRules;
import org.graalvm.compiler.core.match.ComplexMatchResult;
import org.graalvm.compiler.core.match.MatchRule;
import org.graalvm.compiler.lir.LIRFrameState;
import org.graalvm.compiler.lir.aarch64.AArch64ArithmeticOp;
import org.graalvm.compiler.lir.gen.LIRGeneratorTool;
import org.graalvm.compiler.nodes.ConstantNode;
import org.graalvm.compiler.nodes.DeoptimizingNode;
import org.graalvm.compiler.nodes.NodeView;
import org.graalvm.compiler.nodes.ValueNode;
import org.graalvm.compiler.nodes.calc.AddNode;
import org.graalvm.compiler.nodes.calc.BinaryNode;
import org.graalvm.compiler.nodes.calc.LeftShiftNode;
import org.graalvm.compiler.nodes.calc.RightShiftNode;
import org.graalvm.compiler.nodes.calc.UnsignedRightShiftNode;
import org.graalvm.compiler.nodes.memory.Access;

import jdk.vm.ci.aarch64.AArch64Kind;

public class AArch64NodeMatchRules extends NodeMatchRules {

    public AArch64NodeMatchRules(LIRGeneratorTool gen) {
        super(gen);
    }

    protected LIRFrameState getState(Access access) {
        if (access instanceof DeoptimizingNode) {
            return state((DeoptimizingNode) access);
        }
        return null;
    }

    protected AArch64Kind getMemoryKind(Access access) {
        return (AArch64Kind) gen.getLIRKind(access.asNode().stamp(NodeView.DEFAULT)).getPlatformKind();
    }

    private ComplexMatchResult emitAddSubShift(AArch64ArithmeticOp op, ValueNode value, BinaryNode shift) {
        assert shift.getY() instanceof ConstantNode;
        int shiftAmount = shift.getY().asJavaConstant().asInt();

        if (shift instanceof LeftShiftNode) {
            return builder -> getArithmeticLIRGenerator().emitAddSubShift(op, operand(value), operand(shift.getX()),
                            AArch64MacroAssembler.ShiftType.LSL, shiftAmount);
        } else if (shift instanceof RightShiftNode) {
            return builder -> getArithmeticLIRGenerator().emitAddSubShift(op, operand(value), operand(shift.getX()),
                            AArch64MacroAssembler.ShiftType.ASR, shiftAmount);
        } else {
            assert shift instanceof UnsignedRightShiftNode;
            return builder -> getArithmeticLIRGenerator().emitAddSubShift(op, operand(value), operand(shift.getX()),
                            AArch64MacroAssembler.ShiftType.LSR, shiftAmount);
        }
    }

    @MatchRule("(Add=binary a (LeftShift=shift b Constant))")
    @MatchRule("(Add=binary a (RightShift=shift b Constant))")
    @MatchRule("(Add=binary a (UnsignedRightShift=shift b Constant))")
    @MatchRule("(Sub=binary a (LeftShift=shift b Constant))")
    @MatchRule("(Sub=binary a (RightShift=shift b Constant))")
    @MatchRule("(Sub=binary a (UnsignedRightShift=shift b Constant))")
    public ComplexMatchResult addSubShift(BinaryNode binary, ValueNode a, BinaryNode shift) {
        if (binary instanceof AddNode) {
            return emitAddSubShift(AArch64ArithmeticOp.ADD, a, shift);
        }
        return emitAddSubShift(AArch64ArithmeticOp.SUB, a, shift);
    }

    @Override
    public AArch64LIRGenerator getLIRGeneratorTool() {
        return (AArch64LIRGenerator) gen;
    }

    protected AArch64ArithmeticLIRGenerator getArithmeticLIRGenerator() {
        return (AArch64ArithmeticLIRGenerator) getLIRGeneratorTool().getArithmetic();
    }
}