Mercurial > hg > truffle
view graal/com.oracle.graal.lir/src/com/oracle/graal/lir/NullCheckOptimizer.java @ 13531:1f870eaf1e96
Truffle-DSL: Added test for @CreateCast.
author | Christian Humer <christian.humer@gmail.com> |
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date | Tue, 07 Jan 2014 20:05:55 +0100 |
parents | c13633a4d472 |
children | a6595f1b55b0 |
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/* * Copyright (c) 2013, 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; import java.util.*; import com.oracle.graal.lir.StandardOp.ImplicitNullCheck; import com.oracle.graal.lir.StandardOp.NullCheck; import com.oracle.graal.nodes.cfg.*; public final class NullCheckOptimizer { public static void optimize(LIR ir, int implicitNullCheckLimit) { List<Block> blocks = ir.codeEmittingOrder(); NullCheckOptimizer.foldNullChecks(ir, blocks, implicitNullCheckLimit); } private NullCheckOptimizer() { } private static void foldNullChecks(LIR ir, List<Block> blocks, int implicitNullCheckLimit) { for (Block block : blocks) { List<LIRInstruction> list = ir.lir(block); if (!list.isEmpty()) { LIRInstruction lastInstruction = list.get(0); for (int i = 0; i < list.size(); i++) { LIRInstruction instruction = list.get(i); if (instruction instanceof ImplicitNullCheck && lastInstruction instanceof NullCheck) { NullCheck nullCheck = (NullCheck) lastInstruction; ImplicitNullCheck implicitNullCheck = (ImplicitNullCheck) instruction; if (implicitNullCheck.makeNullCheckFor(nullCheck.getCheckedValue(), nullCheck.getState(), implicitNullCheckLimit)) { list.remove(i - 1); if (i < list.size()) { instruction = list.get(i); } } } lastInstruction = instruction; } } } } }