Mercurial > hg > truffle
view graal/Compiler/src/com/sun/c1x/ir/SignificantBitOp.java @ 2507:9ec15d6914ca
Pull over of compiler from maxine repository.
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Wed, 27 Apr 2011 11:43:22 +0200 |
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/* * Copyright (c) 2010, 2011, 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 * or visit www.oracle.com if you need additional information or have any * questions. */ package com.sun.c1x.ir; import com.sun.c1x.debug.*; import com.sun.c1x.util.*; import com.sun.cri.bytecode.*; import com.sun.cri.ci.*; /** * Implements the {@link Bytecodes#LSB} and {@link Bytecodes#MSB} instructions. * * @author Laurent Daynes */ public class SignificantBitOp extends Instruction { Value value; /** * This will be {@link Bytecodes#LSB} or {@link Bytecodes#MSB}. */ public final int op; /** * Create a a new SignificantBitOp instance. * * @param value the instruction producing the value that is input to this instruction * @param opcodeop either {@link Bytecodes#LSB} or {@link Bytecodes#MSB} */ public SignificantBitOp(Value value, int opcodeop) { super(CiKind.Int); assert opcodeop == Bytecodes.LSB || opcodeop == Bytecodes.MSB; this.value = value; this.op = opcodeop; } /** * Gets the instruction producing input to this instruction. * @return the instruction that produces this instruction's input */ public Value value() { return value; } @Override public void inputValuesDo(ValueClosure closure) { value = closure.apply(value); } @Override public void accept(ValueVisitor v) { v.visitSignificantBit(this); } @Override public int valueNumber() { return Util.hash1(op, value); } @Override public boolean valueEqual(Instruction i) { if (i instanceof SignificantBitOp) { SignificantBitOp o = (SignificantBitOp) i; // FIXME: this is a conservative estimate. If x is a single-bit value // (i.e., a power of 2), then the values are equal regardless of the value of the most field. return value == o.value && op == o.op; } return false; } @Override public void print(LogStream out) { out.print(Bytecodes.nameOf(op) + " [").print(this).print("] "); } }