Mercurial > hg > graal-jvmci-8
diff graal/Compiler/src/com/sun/c1x/ir/ArithmeticOp.java @ 2507:9ec15d6914ca
Pull over of compiler from maxine repository.
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Wed, 27 Apr 2011 11:43:22 +0200 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/graal/Compiler/src/com/sun/c1x/ir/ArithmeticOp.java Wed Apr 27 11:43:22 2011 +0200 @@ -0,0 +1,121 @@ +/* + * Copyright (c) 2009, 2011, 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.sun.c1x.ir; + +import com.sun.c1x.*; +import com.sun.c1x.debug.*; +import com.sun.c1x.value.*; +import com.sun.cri.bytecode.*; +import com.sun.cri.ci.*; + +/** + * The {@code ArithmeticOp} class represents arithmetic operations such as addition, subtraction, etc. + * + * @author Ben L. Titzer + */ +public final class ArithmeticOp extends Op2 { + + private FrameState stateBefore; + + /** + * Creates a new arithmetic operation. + * @param opcode the bytecode opcode + * @param kind the result kind of the operation + * @param x the first input instruction + * @param y the second input instruction + * @param isStrictFP indicates this operation has strict rounding semantics + * @param stateBefore the state for instructions that may trap + */ + public ArithmeticOp(int opcode, CiKind kind, Value x, Value y, boolean isStrictFP, FrameState stateBefore) { + super(kind, opcode, x, y); + initFlag(Flag.IsStrictFP, isStrictFP); + if (stateBefore != null) { + // state before is only used in the case of a division or remainder, + // and isn't needed if the zero check is redundant + if (y.isConstant()) { + long divisor = y.asConstant().asLong(); + if (divisor != 0) { + C1XMetrics.ZeroChecksRedundant++; + setFlag(Flag.NoZeroCheck); + } else { + this.stateBefore = stateBefore; + } + if (divisor != -1) { + C1XMetrics.DivideSpecialChecksRedundant++; + setFlag(Flag.NoDivSpecialCase); + } + } else { + this.stateBefore = stateBefore; + } + } + } + + @Override + public FrameState stateBefore() { + return stateBefore; + } + + /** + * Checks whether this instruction has strict fp semantics. + * @return {@code true} if this instruction has strict fp semantics + */ + public boolean isStrictFP() { + return checkFlag(Flag.IsStrictFP); + } + + /** + * Checks whether this instruction can cause a trap. For arithmetic operations, + * only division and remainder operations can cause traps. + * @return {@code true} if this instruction can cause a trap + */ + @Override + public boolean canTrap() { + return stateBefore != null; + } + + @Override + public void accept(ValueVisitor v) { + v.visitArithmeticOp(this); + } + + public boolean isCommutative() { + return Bytecodes.isCommutative(opcode); + } + + public boolean needsZeroCheck() { + return !checkFlag(Flag.NoZeroCheck); + } + + public void eliminateZeroCheck() { + clearRuntimeCheck(Flag.NoZeroCheck); + } + + @Override + public void print(LogStream out) { + out.print(x()). + print(' '). + print(Bytecodes.operator(opcode)). + print(' '). + print(y()); + } +}