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package com.oracle.truffle.llvm.nodes.intrinsics.llvm.arith;

import com.oracle.truffle.api.CompilerDirectives;
import com.oracle.truffle.api.frame.VirtualFrame;
import com.oracle.truffle.api.nodes.UnexpectedResultException;
import com.oracle.truffle.llvm.runtime.LLVMAddress;
import com.oracle.truffle.llvm.runtime.memory.LLVMMemory;
import com.oracle.truffle.llvm.runtime.nodes.api.LLVMExpressionNode;

public final class LLVMComplexMul extends LLVMExpressionNode {

    @Child private LLVMExpressionNode aNode;
    @Child private LLVMExpressionNode bNode;
    @Child private LLVMExpressionNode cNode;
    @Child private LLVMExpressionNode dNode;
    @Child private LLVMExpressionNode alloc;

    public LLVMComplexMul(LLVMExpressionNode alloc, LLVMExpressionNode a, LLVMExpressionNode b, LLVMExpressionNode c, LLVMExpressionNode d) {
        this.alloc = alloc;
        this.aNode = a;
        this.bNode = b;
        this.cNode = c;
        this.dNode = d;
    }

    @Override
    public Object executeGeneric(VirtualFrame frame) {
        try {
            double a = aNode.executeDouble(frame);
            double b = bNode.executeDouble(frame);
            double c = cNode.executeDouble(frame);
            double d = dNode.executeDouble(frame);

            double ac = a * c;
            double bd = b * d;
            double ad = a * d;
            double bc = b * c;
            double zReal = ac - bd;
            double zImag = ad + bc;

            LLVMAddress allocatedMemory = alloc.executeLLVMAddress(frame);
            LLVMMemory.putDouble(allocatedMemory, zReal);
            LLVMMemory.putDouble(allocatedMemory.getVal() + LLVMExpressionNode.DOUBLE_SIZE_IN_BYTES, zImag);

            return allocatedMemory;
        } catch (UnexpectedResultException e) {
            CompilerDirectives.transferToInterpreter();
            throw new IllegalStateException(e);
        }
    }

}