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view graal/com.oracle.graal.lir/src/com/oracle/graal/lir/alloc/lsra/SSALinearScanEliminateSpillMovePhase.java @ 21340:dd013bfdccc3
SSALinearScan: rename sub-phases.
author | Josef Eisl <josef.eisl@jku.at> |
---|---|
date | Tue, 12 May 2015 14:22:16 +0200 |
parents | graal/com.oracle.graal.lir/src/com/oracle/graal/lir/alloc/lsra/SSAEliminateSpillMove.java@1c56b7be2731 |
children | 1c8383a27c1b |
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/* * 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 com.oracle.graal.compiler.common.cfg.*; import com.oracle.graal.debug.*; import com.oracle.graal.debug.Debug.*; import com.oracle.graal.lir.*; import com.oracle.graal.lir.StandardOp.*; import com.oracle.graal.lir.ssa.*; public class SSALinearScanEliminateSpillMovePhase extends LinearScanEliminateSpillMovePhase { SSALinearScanEliminateSpillMovePhase(LinearScan allocator) { super(allocator); } @Override protected int firstInstructionOfInterest() { // also look at Labels as they define PHI values return 0; } @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 : allocator.sortedBlocks) { if (toBlock.getPredecessorCount() > 1) { SSAUtils.removePhiIn(allocator.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 = allocator.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; } 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 = allocator.instructionForId(toInterval.from()); if (!(op instanceof LabelOp)) { return false; } AbstractBlockBase<?> intStartBlock = allocator.blockForId(toInterval.from()); assert allocator.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; } }