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

import com.oracle.truffle.api.CompilerDirectives;
import com.oracle.truffle.api.CompilerDirectives.CompilationFinal;
import com.oracle.truffle.api.frame.VirtualFrame;
import com.oracle.truffle.llvm.runtime.LLVMAddress;
import com.oracle.truffle.llvm.runtime.memory.LLVMMemory;
import com.oracle.truffle.llvm.runtime.memory.LLVMThreadingStack;
import com.oracle.truffle.llvm.runtime.nodes.api.LLVMExpressionNode;
import com.oracle.truffle.llvm.runtime.vector.LLVMFloatVector;

public final class LLVMComplexDivSC extends LLVMExpressionNode {

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

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

    @CompilationFinal private LLVMThreadingStack threadingStack;

    private LLVMThreadingStack getThreadingStack() {
        if (threadingStack == null) {
            CompilerDirectives.transferToInterpreterAndInvalidate();
            threadingStack = getContext().getThreadingStack();
        }
        return threadingStack;
    }

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

        float denom = c * c + d * d;
        float zReal = (a * c + b * d) / denom;
        float zImag = (b * c - a * d) / denom;

        long allocatedMemory = getThreadingStack().getStack().allocateStackMemory(2 * LLVMExpressionNode.FLOAT_SIZE_IN_BYTES, 8);
        LLVMMemory.putFloat(allocatedMemory, zReal);
        LLVMMemory.putFloat(allocatedMemory + LLVMExpressionNode.FLOAT_SIZE_IN_BYTES, zImag);
        return LLVMFloatVector.readVectorFromMemory(LLVMAddress.fromLong(allocatedMemory), 2);
    }

}