1 /* 2 * Copyright (c) 2015, 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 package org.graalvm.compiler.lir.alloc.lsra.ssa; 24 25 import java.util.EnumSet; 26 27 import org.graalvm.compiler.debug.Debug; 28 import org.graalvm.compiler.lir.LIRInstruction; 29 import org.graalvm.compiler.lir.LIRInstruction.OperandFlag; 30 import org.graalvm.compiler.lir.LIRInstruction.OperandMode; 31 import org.graalvm.compiler.lir.StandardOp.LabelOp; 32 import org.graalvm.compiler.lir.ValueConsumer; 33 import org.graalvm.compiler.lir.alloc.lsra.Interval; 34 import org.graalvm.compiler.lir.alloc.lsra.Interval.RegisterPriority; 35 import org.graalvm.compiler.lir.alloc.lsra.LinearScan; 36 import org.graalvm.compiler.lir.alloc.lsra.LinearScanLifetimeAnalysisPhase; 37 import org.graalvm.compiler.lir.ssa.SSAUtil; 38 39 import jdk.vm.ci.meta.AllocatableValue; 40 import jdk.vm.ci.meta.Value; 41 42 public class SSALinearScanLifetimeAnalysisPhase extends LinearScanLifetimeAnalysisPhase { 43 44 SSALinearScanLifetimeAnalysisPhase(LinearScan linearScan) { 45 super(linearScan); 46 } 47 48 @Override 49 protected void addRegisterHint(final LIRInstruction op, final Value targetValue, OperandMode mode, EnumSet<OperandFlag> flags, final boolean hintAtDef) { 50 super.addRegisterHint(op, targetValue, mode, flags, hintAtDef); 51 52 if (hintAtDef && op instanceof LabelOp) { 53 LabelOp label = (LabelOp) op; 54 55 Interval to = allocator.getOrCreateInterval((AllocatableValue) targetValue); 56 57 SSAUtil.forEachPhiRegisterHint(allocator.getLIR(), allocator.blockForId(label.id()), label, targetValue, mode, (ValueConsumer) (registerHint, valueMode, valueFlags) -> { 58 if (LinearScan.isVariableOrRegister(registerHint)) { 59 Interval from = allocator.getOrCreateInterval((AllocatableValue) registerHint); 60 61 setHint(op, to, from); 62 setHint(op, from, to); 63 } 64 }); 65 } 66 } 67 68 public static void setHint(final LIRInstruction op, Interval target, Interval source) { 69 Interval currentHint = target.locationHint(false); 70 if (currentHint == null || currentHint.from() > target.from()) { 71 /* 72 * Update hint if there was none or if the hint interval starts after the hinted 73 * interval. 74 */ 75 target.setLocationHint(source); 76 if (Debug.isLogEnabled()) { 77 Debug.log("operation at opId %d: added hint from interval %d to %d", op.id(), source.operandNumber, target.operandNumber); 78 } 79 } 80 } 81 82 @Override 83 protected RegisterPriority registerPriorityOfOutputOperand(LIRInstruction op) { 84 if (op instanceof LabelOp) { 85 LabelOp label = (LabelOp) op; 86 if (label.isPhiIn()) { 87 return RegisterPriority.None; 88 } 89 } 90 return super.registerPriorityOfOutputOperand(op); 91 } 92 }