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

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.llvm.nodes.intrinsics.llvm.LLVMBuiltin;
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 class LLVMUAddWithOverflow {

    @NodeChildren({@NodeChild(value = "left", type = LLVMExpressionNode.class), @NodeChild(value = "right", type = LLVMExpressionNode.class),
                    @NodeChild(value = "target", type = LLVMExpressionNode.class)})
    public abstract static class LLVMUAddWithOverflowI32 extends LLVMBuiltin {

        private static final int OVERFLOW_FIELD_OFFSET = 4;

        @Specialization
        public LLVMAddress executeDouble(int left, int right, LLVMAddress addr) {
            int result = left + right;
            boolean overflow = (((left ^ result) & (right ^ result)) < 0);
            LLVMMemory.putI32(addr, result);
            LLVMMemory.putI32(addr.getVal() + OVERFLOW_FIELD_OFFSET, overflow ? 1 : 0);
            return addr;
        }
    }

}