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

import com.oracle.truffle.api.dsl.NodeChild;
import com.oracle.truffle.api.dsl.NodeChildren;
import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.api.frame.VirtualFrame;
import com.oracle.truffle.llvm.nodes.asm.support.LLVMAMD64WriteRegisterNode.LLVMAMD64WriteI16RegisterNode;
import com.oracle.truffle.llvm.nodes.asm.support.LLVMAMD64WriteRegisterNode.LLVMAMD64WriteI32RegisterNode;
import com.oracle.truffle.llvm.nodes.asm.support.LLVMAMD64WriteRegisterNode.LLVMAMD64WriteI64RegisterNode;
import com.oracle.truffle.llvm.runtime.nodes.api.LLVMExpressionNode;
import com.oracle.truffle.llvm.nodes.asm.support.LongMultiplication;

public abstract class LLVMAMD64MulNode extends LLVMExpressionNode {
    @NodeChildren({@NodeChild(value = "left", type = LLVMExpressionNode.class), @NodeChild(value = "right", type = LLVMExpressionNode.class)})
    public abstract static class LLVMAMD64MulbNode extends LLVMExpressionNode {
        @Specialization
        protected short executeI16(byte left, byte right) {
            return (short) (Byte.toUnsignedInt(left) * Byte.toUnsignedInt(right));
        }
    }

    @NodeChildren({@NodeChild("left"), @NodeChild("right")})
    public abstract static class LLVMAMD64MulwNode extends LLVMExpressionNode {
        private final LLVMAMD64WriteI16RegisterNode high;

        public LLVMAMD64MulwNode(LLVMAMD64WriteI16RegisterNode high) {
            this.high = high;
        }

        @Specialization
        protected short executeI16(VirtualFrame frame, short left, short right) {
            int value = Short.toUnsignedInt(left) * Short.toUnsignedInt(right);
            short hi = (short) (value >> LLVMExpressionNode.I16_SIZE_IN_BITS);
            high.execute(frame, hi);
            return (short) value;
        }
    }

    @NodeChildren({@NodeChild("left"), @NodeChild("right")})
    public abstract static class LLVMAMD64MullNode extends LLVMExpressionNode {
        private final LLVMAMD64WriteI32RegisterNode high;

        public LLVMAMD64MullNode(LLVMAMD64WriteI32RegisterNode high) {
            this.high = high;
        }

        @Specialization
        protected int executeI32(VirtualFrame frame, int left, int right) {
            long value = Integer.toUnsignedLong(left) * Integer.toUnsignedLong(right);
            int hi = (int) (value >> LLVMExpressionNode.I32_SIZE_IN_BITS);
            high.execute(frame, hi);
            return (int) value;
        }
    }

    @NodeChildren({@NodeChild("left"), @NodeChild("right")})
    public abstract static class LLVMAMD64MulqNode extends LLVMExpressionNode {
        private final LLVMAMD64WriteI64RegisterNode high;

        public LLVMAMD64MulqNode(LLVMAMD64WriteI64RegisterNode high) {
            this.high = high;
        }

        @Specialization
        protected long executeI64(VirtualFrame frame, long left, long right) {
            // FIXME: implement as unsigned operation
            long hi = LongMultiplication.multiplyHigh(left, right);
            high.execute(frame, hi);
            return left * right;
        }
    }
}