--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/Compiler/src/com/sun/c1x/ir/If.java	Wed Apr 27 11:43:22 2011 +0200
@@ -0,0 +1,181 @@
+/*
+ * 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.debug.*;
+import com.sun.c1x.util.*;
+import com.sun.c1x.value.*;
+import com.sun.cri.ci.*;
+
+/**
+ * The {@code If} instruction represents a branch that can go one of two directions
+ * depending on the outcome of a comparison.
+ *
+ * @author Ben L. Titzer
+ */
+public final class If extends BlockEnd {
+
+    Value x;
+    Value y;
+    Condition condition;
+
+    /**
+     * Constructs a new If instruction.
+     * @param x the instruction producing the first input to the instruction
+     * @param cond the condition (comparison operation)
+     * @param unorderedIsTrue {@code true} if unordered is treated as true (floating point operations)
+     * @param y the instruction that produces the second input to this instruction
+     * @param trueSucc the block representing the true successor
+     * @param falseSucc the block representing the false successor
+     * @param stateAfter the state before the branch but after the input values have been popped
+     * @param isSafepoint {@code true} if this branch should be considered a safepoint
+     */
+    public If(Value x, Condition cond, boolean unorderedIsTrue, Value y,
+              BlockBegin trueSucc, BlockBegin falseSucc, FrameState stateAfter, boolean isSafepoint) {
+        super(CiKind.Illegal, stateAfter, isSafepoint);
+        this.x = x;
+        this.y = y;
+        condition = cond;
+        assert Util.archKindsEqual(x, y);
+        initFlag(Flag.UnorderedIsTrue, unorderedIsTrue);
+        successors.add(trueSucc);
+        successors.add(falseSucc);
+    }
+
+    /**
+     * Gets the instruction that produces the first input to this comparison.
+     * @return the instruction producing the first input
+     */
+    public Value x() {
+        return x;
+    }
+
+    /**
+     * Gets the instruction that produces the second input to this comparison.
+     * @return the instruction producing the second input
+     */
+    public Value y() {
+        return y;
+    }
+
+    /**
+     * Gets the condition (comparison operation) for this instruction.
+     * @return the condition
+     */
+    public Condition condition() {
+        return condition;
+    }
+
+    /**
+     * Checks whether unordered inputs mean true or false.
+     * @return {@code true} if unordered inputs produce true
+     */
+    public boolean unorderedIsTrue() {
+        return checkFlag(Flag.UnorderedIsTrue);
+    }
+
+    /**
+     * Gets the block corresponding to the true successor.
+     * @return the true successor
+     */
+    public BlockBegin trueSuccessor() {
+        return successors.get(0);
+    }
+
+    /**
+     * Gets the block corresponding to the false successor.
+     * @return the false successor
+     */
+    public BlockBegin falseSuccessor() {
+        return successors.get(1);
+    }
+
+    /**
+     * Gets the block corresponding to the specified outcome of the branch.
+     * @param istrue {@code true} if the true successor is requested, {@code false} otherwise
+     * @return the corresponding successor
+     */
+    public BlockBegin successor(boolean istrue) {
+        return successors.get(istrue ? 0 : 1);
+    }
+
+    /**
+     * Gets the successor of this instruction for the unordered case.
+     * @return the successor for unordered inputs
+     */
+    public BlockBegin unorderedSuccessor() {
+        return successor(unorderedIsTrue());
+    }
+
+    /**
+     * Swaps the operands to this if and reverses the condition (e.g. > goes to <=).
+     * @see Condition#mirror()
+     */
+    public void swapOperands() {
+        condition = condition.mirror();
+        Value t = x;
+        x = y;
+        y = t;
+    }
+
+    /**
+     * Swaps the successor blocks to this if and negates the condition (e.g. == goes to !=)
+     * @see Condition#negate()
+     */
+    public void swapSuccessors() {
+        setFlag(Flag.UnorderedIsTrue, !unorderedIsTrue());
+        condition = condition.negate();
+        BlockBegin t = successors.get(0);
+        BlockBegin f = successors.get(1);
+        successors.set(0, f);
+        successors.set(1, t);
+    }
+
+    @Override
+    public void inputValuesDo(ValueClosure closure) {
+        x = closure.apply(x);
+        y = closure.apply(y);
+    }
+
+    @Override
+    public void accept(ValueVisitor v) {
+        v.visitIf(this);
+    }
+
+    @Override
+    public void print(LogStream out) {
+        out.print("if ").
+        print(x()).
+        print(' ').
+        print(condition().operator).
+        print(' ').
+        print(y()).
+        print(" then B").
+        print(successors().get(0).blockID).
+        print(" else B").
+        print(successors().get(1).blockID);
+        if (isSafepoint()) {
+            out.print(" (safepoint)");
+        }
+    }
+}