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package com.oracle.truffle.llvm.runtime.nodes.asm;

import com.oracle.truffle.api.dsl.NodeChild;
import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.api.frame.VirtualFrame;
import com.oracle.truffle.api.profiles.ConditionProfile;
import com.oracle.truffle.llvm.runtime.nodes.asm.support.LLVMAMD64UpdateFlagsNode.LLVMAMD64UpdateCPZSOFlagsNode;
import com.oracle.truffle.llvm.runtime.nodes.api.LLVMExpressionNode;

@NodeChild("left")
@NodeChild("right")
@NodeChild("cf")
public abstract class LLVMAMD64AdcNode extends LLVMExpressionNode {
    @Child protected LLVMAMD64UpdateCPZSOFlagsNode flags;

    protected final ConditionProfile noCfProfile = ConditionProfile.createCountingProfile();
    protected final ConditionProfile smallLeftProfile = ConditionProfile.createCountingProfile();
    protected final ConditionProfile smallRightProfile = ConditionProfile.createCountingProfile();

    private static boolean carry(byte left, byte right) {
        byte result = (byte) (left + right);
        return ((left < 0 || right < 0) && result >= 0) || (left < 0 && right < 0);
    }

    private static boolean carry(short left, short right) {
        short result = (short) (left + right);
        return ((left < 0 || right < 0) && result >= 0) || (left < 0 && right < 0);
    }

    private static boolean carry(int left, int right) {
        int result = left + right;
        return ((left < 0 || right < 0) && result >= 0) || (left < 0 && right < 0);
    }

    private static boolean carry(long left, long right) {
        long result = left + right;
        return ((left < 0 || right < 0) && result >= 0) || (left < 0 && right < 0);
    }

    private static boolean overflow(byte left, byte right) {
        byte result = (byte) (left + right);
        return (result < 0 && left > 0 && right > 0) || (result >= 0 && left < 0 && right < 0);
    }

    private static boolean overflow(short left, short right) {
        short result = (short) (left + right);
        return (result < 0 && left > 0 && right > 0) || (result >= 0 && left < 0 && right < 0);
    }

    private static boolean overflow(int left, int right) {
        int result = left + right;
        return (result < 0 && left > 0 && right > 0) || (result >= 0 && left < 0 && right < 0);
    }

    private static boolean overflow(long left, long right) {
        long result = left + right;
        return (result < 0 && left > 0 && right > 0) || (result >= 0 && left < 0 && right < 0);
    }

    private LLVMAMD64AdcNode(LLVMAMD64UpdateCPZSOFlagsNode flags) {
        this.flags = flags;
    }

    public abstract static class LLVMAMD64AdcbNode extends LLVMAMD64AdcNode {
        public LLVMAMD64AdcbNode(LLVMAMD64UpdateCPZSOFlagsNode flags) {
            super(flags);
        }

        @Specialization
        protected byte doI8(VirtualFrame frame, byte left, byte right, boolean cf) {
            byte c = (byte) (cf ? 1 : 0);
            byte result = (byte) (left + right + c);
            boolean overflow;
            boolean carry;
            if (noCfProfile.profile(!cf)) {
                overflow = (result < 0 && left > 0 && right > 0) || (result >= 0 && left < 0 && right < 0);
                carry = ((left < 0 || right < 0) && result >= 0) || (left < 0 && right < 0);
            } else if (smallLeftProfile.profile(left != -1)) {
                overflow = overflow((byte) (left + 1), right);
                carry = carry((byte) (left + 1), right);
            } else if (smallRightProfile.profile(right != -1)) {
                overflow = overflow(left, (byte) (right + 1));
                carry = carry(left, (byte) (right + 1));
            } else {
                overflow = false;
                carry = true;
            }
            flags.execute(frame, overflow, carry, result);
            return result;
        }
    }

    public abstract static class LLVMAMD64AdcwNode extends LLVMAMD64AdcNode {
        public LLVMAMD64AdcwNode(LLVMAMD64UpdateCPZSOFlagsNode flags) {
            super(flags);
        }

        @Specialization
        protected short doI16(VirtualFrame frame, short left, short right, boolean cf) {
            short c = (short) (cf ? 1 : 0);
            short result = (short) (left + right + c);
            boolean overflow;
            boolean carry;
            if (noCfProfile.profile(!cf)) {
                overflow = (result < 0 && left > 0 && right > 0) || (result >= 0 && left < 0 && right < 0);
                carry = ((left < 0 || right < 0) && result >= 0) || (left < 0 && right < 0);
            } else if (smallLeftProfile.profile(left != -1)) {
                overflow = overflow((short) (left + 1), right);
                carry = carry((short) (left + 1), right);
            } else if (smallRightProfile.profile(right != -1)) {
                overflow = overflow(left, (short) (right + 1));
                carry = carry(left, (short) (right + 1));
            } else {
                overflow = false;
                carry = true;
            }
            flags.execute(frame, overflow, carry, result);
            return result;
        }
    }

    public abstract static class LLVMAMD64AdclNode extends LLVMAMD64AdcNode {
        public LLVMAMD64AdclNode(LLVMAMD64UpdateCPZSOFlagsNode flags) {
            super(flags);
        }

        @Specialization
        protected int doI32(VirtualFrame frame, int left, int right, boolean cf) {
            int c = cf ? 1 : 0;
            int result = left + right + c;
            boolean overflow;
            boolean carry;
            if (noCfProfile.profile(!cf)) {
                overflow = (result < 0 && left > 0 && right > 0) || (result >= 0 && left < 0 && right < 0);
                carry = ((left < 0 || right < 0) && result >= 0) || (left < 0 && right < 0);
            } else if (smallLeftProfile.profile(left != -1)) {
                overflow = overflow(left + 1, right);
                carry = carry(left + 1, right);
            } else if (smallRightProfile.profile(right != -1)) {
                overflow = overflow(left, right + 1);
                carry = carry(left, right + 1);
            } else {
                overflow = false;
                carry = true;
            }
            flags.execute(frame, overflow, carry, result);
            return result;
        }
    }

    public abstract static class LLVMAMD64AdcqNode extends LLVMAMD64AdcNode {
        public LLVMAMD64AdcqNode(LLVMAMD64UpdateCPZSOFlagsNode flags) {
            super(flags);
        }

        @Specialization
        protected long doI64(VirtualFrame frame, long left, long right, boolean cf) {
            long c = cf ? 1 : 0;
            long result = left + right + c;
            boolean overflow;
            boolean carry;
            if (noCfProfile.profile(!cf)) {
                overflow = (result < 0 && left > 0 && right > 0) || (result >= 0 && left < 0 && right < 0);
                carry = ((left < 0 || right < 0) && result >= 0) || (left < 0 && right < 0);
            } else if (smallLeftProfile.profile(left != -1)) {
                overflow = overflow(left + 1, right);
                carry = carry(left + 1, right);
            } else if (smallRightProfile.profile(right != -1)) {
                overflow = overflow(left, right + 1);
                carry = carry(left, right + 1);
            } else {
                overflow = false;
                carry = true;
            }
            flags.execute(frame, overflow, carry, result);
            return result;
        }
    }
}