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 * conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright notice, this list of
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 * endorse or promote products derived from this software without specific prior written
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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.LLVMAMD64WriteBooleanNode;
import com.oracle.truffle.llvm.runtime.nodes.api.LLVMExpressionNode;

@NodeChild("src")
@NodeChild("dst")
public abstract class LLVMAMD64BsrNode extends LLVMExpressionNode {
    @Child protected LLVMAMD64WriteBooleanNode writeZFNode;
    protected final ConditionProfile profile;

    public LLVMAMD64BsrNode(LLVMAMD64WriteBooleanNode writeZFNode) {
        this.writeZFNode = writeZFNode;
        profile = ConditionProfile.createCountingProfile();
    }

    public abstract static class LLVMAMD64BsrwNode extends LLVMAMD64BsrNode {
        public LLVMAMD64BsrwNode(LLVMAMD64WriteBooleanNode writeZFNode) {
            super(writeZFNode);
        }

        @Specialization
        protected short doI16(VirtualFrame frame, short src, short dst) {
            if (profile.profile(src == 0)) {
                writeZFNode.execute(frame, true);
                return dst;
            } else {
                writeZFNode.execute(frame, false);
                int val = Short.toUnsignedInt(src);
                int numberOfLeadingZeros = Integer.numberOfLeadingZeros(val) - LLVMExpressionNode.I32_SIZE_IN_BITS + LLVMExpressionNode.I16_SIZE_IN_BITS;
                return (short) (LLVMExpressionNode.I16_SIZE_IN_BITS - numberOfLeadingZeros - 1);
            }
        }
    }

    public abstract static class LLVMAMD64BsrlNode extends LLVMAMD64BsrNode {
        public LLVMAMD64BsrlNode(LLVMAMD64WriteBooleanNode writeZFNode) {
            super(writeZFNode);
        }

        @Specialization
        protected int doI32(VirtualFrame frame, int src, int dst) {
            if (profile.profile(src == 0)) {
                writeZFNode.execute(frame, true);
                return dst;
            } else {
                writeZFNode.execute(frame, false);
                int numberOfLeadingZeros = Integer.numberOfLeadingZeros(src);
                return LLVMExpressionNode.I32_SIZE_IN_BITS - numberOfLeadingZeros - 1;
            }
        }
    }

    public abstract static class LLVMAMD64BsrqNode extends LLVMAMD64BsrNode {
        public LLVMAMD64BsrqNode(LLVMAMD64WriteBooleanNode writeZFNode) {
            super(writeZFNode);
        }

        @Specialization
        protected long doI64(VirtualFrame frame, long src, long dst) {
            if (profile.profile(src == 0)) {
                writeZFNode.execute(frame, true);
                return dst;
            } else {
                writeZFNode.execute(frame, false);
                int numberOfLeadingZeros = Long.numberOfLeadingZeros(src);
                return LLVMExpressionNode.I64_SIZE_IN_BITS - numberOfLeadingZeros - 1;
            }
        }
    }
}