--- /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());
+    }
+}