Mercurial > hg > graal-compiler
view graal/com.oracle.graal.lir/src/com/oracle/graal/lir/alloc/lsra/SSALinearScan.java @ 21246:b2b3c514a391
MoveResolver: don't call check from constructor.
author | Josef Eisl <josef.eisl@jku.at> |
---|---|
date | Tue, 05 May 2015 16:24:39 +0200 |
parents | a2430e146460 |
children | fd18bffefcc1 |
line wrap: on
line source
/* * Copyright (c) 2015, 2015, 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.oracle.graal.lir.alloc.lsra; import static com.oracle.graal.api.code.ValueUtil.*; import static com.oracle.graal.lir.LIRValueUtil.*; import java.util.*; import com.oracle.graal.api.code.*; import com.oracle.graal.api.meta.*; import com.oracle.graal.compiler.common.alloc.*; import com.oracle.graal.compiler.common.cfg.*; import com.oracle.graal.debug.*; import com.oracle.graal.debug.Debug.Scope; import com.oracle.graal.lir.*; import com.oracle.graal.lir.LIRInstruction.OperandFlag; import com.oracle.graal.lir.LIRInstruction.OperandMode; import com.oracle.graal.lir.StandardOp.LabelOp; import com.oracle.graal.lir.StandardOp.MoveOp; import com.oracle.graal.lir.gen.*; import com.oracle.graal.lir.gen.LIRGeneratorTool.SpillMoveFactory; import com.oracle.graal.lir.ssa.*; import com.oracle.graal.lir.ssa.SSAUtils.PhiValueVisitor; final class SSALinearScan extends LinearScan { private static final DebugMetric numPhiResolutionMoves = Debug.metric("SSA LSRA[numPhiResolutionMoves]"); private static final DebugMetric numStackToStackMoves = Debug.metric("SSA LSRA[numStackToStackMoves]"); SSALinearScan(TargetDescription target, LIRGenerationResult res, SpillMoveFactory spillMoveFactory, RegisterAllocationConfig regAllocConfig) { super(target, res, spillMoveFactory, regAllocConfig); } @Override protected MoveResolver createMoveResolver() { SSAMoveResolver moveResolver = new SSAMoveResolver(this); assert moveResolver.checkEmpty(); return moveResolver; } @Override protected int firstInstructionOfInterest() { // also look at Labels as they define PHI values return 0; } @Override void resolveCollectMappings(AbstractBlockBase<?> fromBlock, AbstractBlockBase<?> toBlock, AbstractBlockBase<?> midBlock, MoveResolver moveResolver) { super.resolveCollectMappings(fromBlock, toBlock, midBlock, moveResolver); if (toBlock.getPredecessorCount() > 1) { int toBlockFirstInstructionId = getFirstLirInstructionId(toBlock); int fromBlockLastInstructionId = getLastLirInstructionId(fromBlock) + 1; AbstractBlockBase<?> phiOutBlock = midBlock != null ? midBlock : fromBlock; List<LIRInstruction> instructions = ir.getLIRforBlock(phiOutBlock); int phiOutIdx = SSAUtils.phiOutIndex(ir, phiOutBlock); int phiOutId = midBlock != null ? fromBlockLastInstructionId : instructions.get(phiOutIdx).id(); assert phiOutId >= 0; PhiValueVisitor visitor = new PhiValueVisitor() { public void visit(Value phiIn, Value phiOut) { Interval toInterval = splitChildAtOpId(intervalFor(phiIn), toBlockFirstInstructionId, LIRInstruction.OperandMode.DEF); if (isConstant(phiOut)) { numPhiResolutionMoves.increment(); moveResolver.addMapping(phiOut, toInterval); } else { Interval fromInterval = splitChildAtOpId(intervalFor(phiOut), phiOutId, LIRInstruction.OperandMode.DEF); if (fromInterval != toInterval && !fromInterval.location().equals(toInterval.location())) { numPhiResolutionMoves.increment(); if (!(isStackSlotValue(toInterval.location()) && isStackSlotValue(fromInterval.location()))) { moveResolver.addMapping(fromInterval, toInterval); } else { numStackToStackMoves.increment(); moveResolver.addMapping(fromInterval, toInterval); } } } } }; SSAUtils.forEachPhiValuePair(ir, toBlock, phiOutBlock, visitor); SSAUtils.removePhiOut(ir, phiOutBlock); } } @Override protected void beforeSpillMoveElimination() { /* * PHI Ins are needed for the RegisterVerifier, otherwise PHIs where the Out and In value * matches (ie. there is no resolution move) are falsely detected as errors. */ try (Scope s1 = Debug.scope("Remove Phi In")) { for (AbstractBlockBase<?> toBlock : sortedBlocks) { if (toBlock.getPredecessorCount() > 1) { SSAUtils.removePhiIn(ir, toBlock); } } } } @Override protected boolean canEliminateSpillMove(AbstractBlockBase<?> block, MoveOp move) { // SSA Linear Scan might introduce moves to stack slots assert isVariable(move.getResult()) || LinearScanPhase.SSA_LSRA.getValue() : "Move should not be produced in a non-SSA compilation: " + move; Interval curInterval = intervalFor(move.getResult()); if (!isRegister(curInterval.location()) && curInterval.alwaysInMemory() && !isPhiResolutionMove(block, move, curInterval)) { assert isStackSlotValue(curInterval.location()) : "Not a stack slot: " + curInterval.location(); return true; } return false; } @Override void addRegisterHint(final LIRInstruction op, final Value targetValue, OperandMode mode, EnumSet<OperandFlag> flags, final boolean hintAtDef) { super.addRegisterHint(op, targetValue, mode, flags, hintAtDef); if (hintAtDef && op instanceof LabelOp) { LabelOp label = (LabelOp) op; Interval to = getOrCreateInterval((AllocatableValue) targetValue); SSAUtils.forEachPhiRegisterHint(ir, blockForId(label.id()), label, targetValue, mode, (ValueConsumer) (registerHint, valueMode, valueFlags) -> { if (isVariableOrRegister(registerHint)) { Interval from = getOrCreateInterval((AllocatableValue) registerHint); setHint(op, to, from); setHint(op, from, to); } }); } } private static void setHint(final LIRInstruction op, Interval target, Interval source) { Interval currentHint = target.locationHint(false); if (currentHint == null || currentHint.from() > target.from()) { /* * Update hint if there was none or if the hint interval starts after the hinted * interval. */ target.setLocationHint(source); if (Debug.isLogEnabled()) { Debug.log("operation at opId %d: added hint from interval %d to %d", op.id(), source.operandNumber, target.operandNumber); } } } private boolean isPhiResolutionMove(AbstractBlockBase<?> block, MoveOp move, Interval toInterval) { if (!LinearScanPhase.SSA_LSRA.getValue()) { return false; } if (!toInterval.isSplitParent()) { return false; } if ((toInterval.from() & 1) == 1) { // phi intervals start at even positions. return false; } if (block.getSuccessorCount() != 1) { return false; } LIRInstruction op = instructionForId(toInterval.from()); if (!(op instanceof LabelOp)) { return false; } AbstractBlockBase<?> intStartBlock = blockForId(toInterval.from()); assert ir.getLIRforBlock(intStartBlock).get(0).equals(op); if (!block.getSuccessors().get(0).equals(intStartBlock)) { return false; } try (Indent indet = Debug.indent()) { Debug.log("Is a move (%s) to phi interval %s", move, toInterval); } return true; } }