Mercurial > hg > graal-jvmci-8
view graal/com.oracle.graal.lir/src/com/oracle/graal/lir/alloc/lsra/SSAResolveDataFlow.java @ 21335:f2e3054bd164
SSALinearScan: add SSAResolveDataFlow.
author | Josef Eisl <josef.eisl@jku.at> |
---|---|
date | Tue, 12 May 2015 13:42:25 +0200 |
parents | |
children | 1c56b7be2731 |
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 java.util.*; import com.oracle.graal.api.meta.*; import com.oracle.graal.compiler.common.cfg.*; import com.oracle.graal.debug.*; import com.oracle.graal.lir.*; import com.oracle.graal.lir.ssa.*; import com.oracle.graal.lir.ssa.SSAUtils.PhiValueVisitor; class SSAResolveDataFlow extends ResolveDataFlow { private static final DebugMetric numPhiResolutionMoves = Debug.metric("SSA LSRA[numPhiResolutionMoves]"); private static final DebugMetric numStackToStackMoves = Debug.metric("SSA LSRA[numStackToStackMoves]"); SSAResolveDataFlow(LinearScan allocator) { super(allocator); } @Override void resolveCollectMappings(AbstractBlockBase<?> fromBlock, AbstractBlockBase<?> toBlock, AbstractBlockBase<?> midBlock, MoveResolver moveResolver) { super.resolveCollectMappings(fromBlock, toBlock, midBlock, moveResolver); if (toBlock.getPredecessorCount() > 1) { int toBlockFirstInstructionId = allocator.getFirstLirInstructionId(toBlock); int fromBlockLastInstructionId = allocator.getLastLirInstructionId(fromBlock) + 1; AbstractBlockBase<?> phiOutBlock = midBlock != null ? midBlock : fromBlock; List<LIRInstruction> instructions = allocator.ir.getLIRforBlock(phiOutBlock); int phiOutIdx = SSAUtils.phiOutIndex(allocator.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 = allocator.splitChildAtOpId(allocator.intervalFor(phiIn), toBlockFirstInstructionId, LIRInstruction.OperandMode.DEF); if (isConstant(phiOut)) { numPhiResolutionMoves.increment(); moveResolver.addMapping(phiOut, toInterval); } else { Interval fromInterval = allocator.splitChildAtOpId(allocator.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(allocator.ir, toBlock, phiOutBlock, visitor); SSAUtils.removePhiOut(allocator.ir, phiOutBlock); } } }