/*
 * Copyright (c) 2012, 2012, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 */
package com.oracle.graal.snippets.target.amd64;

import com.oracle.graal.api.code.*;
import com.oracle.graal.api.meta.*;
import com.oracle.graal.lir.amd64.*;
import com.oracle.graal.lir.asm.*;
import com.oracle.max.asm.target.amd64.*;


public class AMD64BitScanOp extends AMD64LIRInstruction {
    public enum IntrinsicOpcode  {
        BSF,
        BSR;
    }

    @Opcode private final IntrinsicOpcode opcode;
    @Def protected Value result;
    @Use({OperandFlag.REG, OperandFlag.ADDR}) protected Value input;

    public AMD64BitScanOp(IntrinsicOpcode opcode, Value result, Value input) {
        this.opcode = opcode;
        this.result = result;
        this.input = input;
    }

    @Override
    public void emitCode(TargetMethodAssembler tasm, AMD64MacroAssembler masm) {
        switch(opcode) {
            case BSF:
                if (ValueUtil.isAddress(input)) {
                    masm.bsfq(ValueUtil.asIntReg(result), ValueUtil.asAddress(input));
                } else {
                    masm.bsfq(ValueUtil.asIntReg(result), ValueUtil.asRegister(input));
                }
                break;
            case BSR:
                if (ValueUtil.isAddress(input)) {
                    masm.bsrq(ValueUtil.asIntReg(result), ValueUtil.asAddress(input));
                } else {
                    masm.bsrq(ValueUtil.asIntReg(result), ValueUtil.asRegister(input));
                }
                break;
        }
    }

}