# HG changeset patch
# User Roland Schatz <roland.schatz@oracle.com>
# Date 1422356741 -3600
# Node ID 858b1e3ab2eed887ac786106e2a174e8d2fa3cb1
# Parent  7efef7005e534e650c4379ef2df9eb48a574f12a
Enable constant folding of Math.pow().

diff -r 7efef7005e53 -r 858b1e3ab2ee graal/com.oracle.graal.replacements/src/com/oracle/graal/replacements/MathSubstitutionsX86.java
--- a/graal/com.oracle.graal.replacements/src/com/oracle/graal/replacements/MathSubstitutionsX86.java	Tue Jan 27 12:25:38 2015 +0100
+++ b/graal/com.oracle.graal.replacements/src/com/oracle/graal/replacements/MathSubstitutionsX86.java	Tue Jan 27 12:05:41 2015 +0100
@@ -28,6 +28,7 @@
 import com.oracle.graal.graph.Node.NodeIntrinsic;
 import com.oracle.graal.nodes.calc.*;
 import com.oracle.graal.nodes.extended.*;
+import com.oracle.graal.nodes.spi.*;
 import com.oracle.graal.replacements.nodes.*;
 import com.oracle.graal.replacements.nodes.MathIntrinsicNode.Operation;
 
@@ -67,6 +68,7 @@
     /**
      * Special cases from {@link Math#pow} and __ieee754_pow (in sharedRuntimeTrans.cpp).
      */
+    @MacroSubstitution(macro = MathPowNode.class)
     @MethodSubstitution(guard = UnsafeSubstitutions.GetAndSetGuard.class)
     public static double pow(double x, double y) {
         // If the second argument is positive or negative zero, then the result is 1.0.
diff -r 7efef7005e53 -r 858b1e3ab2ee graal/com.oracle.graal.replacements/src/com/oracle/graal/replacements/nodes/MathPowNode.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.graal.replacements/src/com/oracle/graal/replacements/nodes/MathPowNode.java	Tue Jan 27 12:05:41 2015 +0100
@@ -0,0 +1,58 @@
+/*
+ * 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.replacements.nodes;
+
+import com.oracle.graal.graph.spi.*;
+import com.oracle.graal.nodeinfo.*;
+import com.oracle.graal.nodes.*;
+import com.oracle.graal.nodes.extended.*;
+
+/**
+ * This is an extension of {@link MacroNode} that is a {@link StateSplit} and a
+ * {@link MemoryCheckpoint}.
+ */
+@NodeInfo
+public class MathPowNode extends MacroStateSplitNode implements Canonicalizable.Binary<ValueNode> {
+
+    public MathPowNode(Invoke i) {
+        super(i);
+    }
+
+    public ValueNode canonical(CanonicalizerTool tool, ValueNode forX, ValueNode forY) {
+        if (forX.isConstant() && forY.isConstant()) {
+            double x = forX.asJavaConstant().asDouble();
+            double y = forY.asJavaConstant().asDouble();
+            return ConstantNode.forDouble(Math.pow(x, y));
+        } else {
+            return this;
+        }
+    }
+
+    public ValueNode getX() {
+        return arguments.get(0);
+    }
+
+    public ValueNode getY() {
+        return arguments.get(1);
+    }
+}