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view graal/com.oracle.max.asmdis/src/com/sun/max/asm/ppc/BOOperand.java @ 3733:e233f5660da4
Added Java files from Maxine project.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Sat, 17 Dec 2011 19:59:18 +0100 |
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/* * Copyright (c) 2007, 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.max.asm.ppc; import com.sun.max.asm.*; import com.sun.max.util.*; /** * The argument to a Branch Conditional instruction specifying the conditions * under which the branch is taken. */ public final class BOOperand extends AbstractSymbolicArgument { private BOOperand(String value, String predictionBitsMask) { this(value, null, null, predictionBitsMask); } private BOOperand(String value) { this(value, null, null, null); } private BOOperand(String value, BOOperand taken, BOOperand notTaken, String predictionBitsMask) { super(Integer.parseInt(value, 2)); assert value.length() == 5; assert predictionBitsMask == null || predictionBitsMask.length() == value.length(); this.taken = taken; this.notTaken = notTaken; if (predictionBitsMask == null) { valueWithoutPredictionBits = Integer.MAX_VALUE; } else { int valWithoutPredictionBits = 0; int bit = 1 << (value.length() - 1); for (int i = 0; i != predictionBitsMask.length(); ++i) { if (predictionBitsMask.charAt(i) == '0') { if (value.charAt(i) == '1') { valWithoutPredictionBits |= bit; } } else { valWithoutPredictionBits >>= 1; } bit >>= 1; } this.valueWithoutPredictionBits = valWithoutPredictionBits; } } /** * The GNU assembler syntax does not have symbols for the valid values * and only accepts numeric arguments. */ @Override public String externalValue() { return Integer.toString(value()); } private final BOOperand taken; private final BOOperand notTaken; private final int valueWithoutPredictionBits; /** * @return the version of this branch condition operand that has the relevant bits set to indicate to the hardware that the branch is very likely not to be taken * * @throws IllegalArgumentException if prediction bits cannot be set for this operand */ public BOOperand taken() { if (taken == null) { throw new IllegalArgumentException("branch condition " + this + " does not support branch prediction"); } return taken; } /** * @return the version of this branch condition operand that has the relevant bits set to indicate to the hardware that the branch is very likely not to be taken * * @throws IllegalArgumentException if prediction bits cannot be set for this operand */ public BOOperand notTaken() { if (notTaken == null) { throw new IllegalArgumentException("branch condition " + this + " does not support branch prediction"); } return notTaken; } /** * @return the mask to apply to this branch condition operand to extract the branch prediction bits * * @throws IllegalArgumentException if this branch condition operand does not support branch prediction */ public int valueWithoutPredictionBits() { if (valueWithoutPredictionBits == Integer.MAX_VALUE) { throw new IllegalArgumentException("branch condition " + this + " does not support branch prediction"); } return valueWithoutPredictionBits; } // Checkstyle: stop constant name check /** * Decrement the Counter Register, then branch if the decremented value is not 0 and * the bit in the Condition Register selected by the BI field is not set. */ public static final BOOperand CTRNonZero_CRFalse = new BOOperand("00000"); /** * Decrement the Counter Register, then branch if the decremented value is 0 and * the bit in the Condition Register selected by the BI field is not set. */ public static final BOOperand CTRZero_CRFalse = new BOOperand("00010"); /** * Branch if the bit in the Condition Register selected by the BI field is not set * and indicate that the branch is very likely to be taken. */ public static final BOOperand CRFalse_PredictTaken = new BOOperand("00111", "00011"); /** * Branch if the bit in the Condition Register selected by the BI field is not set * and indicate that the branch is very likely not to be taken. */ public static final BOOperand CRFalse_PredictNotTaken = new BOOperand("00110", "00011"); /** * Branch if the bit in the Condition Register selected by the BI field is not set. */ public static final BOOperand CRFalse = new BOOperand("00100", CRFalse_PredictTaken, CRFalse_PredictNotTaken, "00011"); /** * Decrement the Counter Register, then branch if the decremented value is not 0 and * the bit in the Condition Register selected by the BI field is set. */ public static final BOOperand CTRNonZero_CRTrue = new BOOperand("01000"); /** * Decrement the Counter Register, then branch if the decremented value is 0 and * the bit in the Condition Register selected by the BI field is set. */ public static final BOOperand CTRZero_CRTrue = new BOOperand("01010"); /** * Branch if the bit in the Condition Register selected by the BI field is set * and indicate that the branch is very likely to be taken. */ public static final BOOperand CRTrue_PredictTaken = new BOOperand("01111", "00011"); /** * Branch if the bit in the Condition Register selected by the BI field is set * and indicate that the branch is very likely not to be taken. */ public static final BOOperand CRTrue_PredictNotTaken = new BOOperand("01110", "00011"); /** * Branch if the bit in the Condition Register selected by the BI field is set. */ public static final BOOperand CRTrue = new BOOperand("01100", CRTrue_PredictTaken, CRTrue_PredictNotTaken, "00011"); /** * Decrement the Counter Register, then branch if the decremented value is 0 * and indicate that the branch is very likely to be taken. */ public static final BOOperand CTRNonZero_PredictTaken = new BOOperand("11001", "01001"); /** * Decrement the Counter Register, then branch if the decremented value is 0 * and indicate that the branch is very likely not to be taken. */ public static final BOOperand CTRNonZero_PredictNotTaken = new BOOperand("11000", "01001"); /** * Decrement the Counter Register, then branch if the decremented value is 0. */ public static final BOOperand CTRNonZero = new BOOperand("10000", CTRNonZero_PredictTaken, CTRNonZero_PredictNotTaken, "01001"); /** * Decrement the Counter Register, then branch if the decremented value is 0 * and indicate that the branch is very likely to be taken. */ public static final BOOperand CTRZero_PredictTaken = new BOOperand("11011", "01001"); /** * Decrement the Counter Register, then branch if the decremented value is 0 * and indicate that the branch is very likely not to be taken. */ public static final BOOperand CTRZero_PredictNotTaken = new BOOperand("11010", "01001"); /** * Decrement the Counter Register, then branch if the decremented value is 0. */ public static final BOOperand CTRZero = new BOOperand("10010", CTRZero_PredictTaken, CTRZero_PredictNotTaken, "01001"); /** * Branch always. */ public static final BOOperand Always = new BOOperand("10100"); // Checkstyle: resume constant name check public static final Symbolizer<BOOperand> SYMBOLIZER = Symbolizer.Static.initialize(BOOperand.class); }