--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.graal.replacements.amd64/src/com/oracle/graal/replacements/amd64/AMD64MathSubstitutions.java	Wed Apr 08 22:09:05 2015 +0200
@@ -0,0 +1,117 @@
+/*
+ * Copyright (c) 2011, 2014, 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.amd64;
+
+import static com.oracle.graal.compiler.target.Backend.*;
+
+import com.oracle.graal.api.meta.*;
+import com.oracle.graal.graph.Node.ConstantNodeParameter;
+import com.oracle.graal.graph.Node.NodeIntrinsic;
+import com.oracle.graal.nodes.extended.*;
+import com.oracle.graal.replacements.amd64.AMD64MathIntrinsicNode.Operation;
+
+/**
+ * Substitutions for some {@link java.lang.Math} methods that leverage AMD64 instructions for
+ * selected input values.
+ */
+public class AMD64MathSubstitutions {
+
+    private static final double PI_4 = Math.PI / 4;
+
+    /**
+     * Special cases from {@link Math#pow} and __ieee754_pow (in sharedRuntimeTrans.cpp).
+     */
+    public static double pow(double x, double y) {
+        // If the second argument is positive or negative zero, then the result is 1.0.
+        if (y == 0.0D) {
+            return 1;
+        }
+
+        // If the second argument is 1.0, then the result is the same as the first argument.
+        if (y == 1.0D) {
+            return x;
+        }
+
+        // If the second argument is NaN, then the result is NaN.
+        if (Double.isNaN(y)) {
+            return Double.NaN;
+        }
+
+        // If the first argument is NaN and the second argument is nonzero, then the result is NaN.
+        if (Double.isNaN(x) && y != 0.0D) {
+            return Double.NaN;
+        }
+
+        // x**-1 = 1/x
+        if (y == -1.0D) {
+            return 1 / x;
+        }
+
+        // x**2 = x*x
+        if (y == 2.0D) {
+            return x * x;
+        }
+
+        // x**0.5 = sqrt(x)
+        if (y == 0.5D && x >= 0.0D) {
+            return Math.sqrt(x);
+        }
+        return callDouble2(ARITHMETIC_POW, x, y);
+    }
+
+    // NOTE on snippets below:
+    // Math.sin(), .cos() and .tan() guarantee a value within 1 ULP of the
+    // exact result, but x87 trigonometric FPU instructions are only that
+    // accurate within [-pi/4, pi/4]. Examine the passed value and provide
+    // a slow path for inputs outside of that interval.
+
+    public static double sin(double x) {
+        if (Math.abs(x) < PI_4) {
+            return AMD64MathIntrinsicNode.compute(x, Operation.SIN);
+        } else {
+            return callDouble1(ARITHMETIC_SIN, x);
+        }
+    }
+
+    public static double cos(double x) {
+        if (Math.abs(x) < PI_4) {
+            return AMD64MathIntrinsicNode.compute(x, Operation.COS);
+        } else {
+            return callDouble1(ARITHMETIC_COS, x);
+        }
+    }
+
+    public static double tan(double x) {
+        if (Math.abs(x) < PI_4) {
+            return AMD64MathIntrinsicNode.compute(x, Operation.TAN);
+        } else {
+            return callDouble1(ARITHMETIC_TAN, x);
+        }
+    }
+
+    @NodeIntrinsic(value = ForeignCallNode.class, setStampFromReturnType = true)
+    private static native double callDouble1(@ConstantNodeParameter ForeignCallDescriptor descriptor, double value);
+
+    @NodeIntrinsic(value = ForeignCallNode.class, setStampFromReturnType = true)
+    private static native double callDouble2(@ConstantNodeParameter ForeignCallDescriptor descriptor, double a, double b);
+}