--- /dev/null	2017-01-22 10:16:57.869617664 -0800
+++ new/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.hotspot/src/org/graalvm/compiler/hotspot/replacements/BigIntegerSubstitutions.java	2017-02-15 17:00:18.179076267 -0800
@@ -0,0 +1,87 @@
+/*
+ * Copyright (c) 2016, 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 org.graalvm.compiler.hotspot.replacements;
+
+import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.arrayStart;
+
+import org.graalvm.compiler.api.directives.GraalDirectives;
+import org.graalvm.compiler.api.replacements.ClassSubstitution;
+import org.graalvm.compiler.api.replacements.MethodSubstitution;
+import org.graalvm.compiler.hotspot.HotSpotBackend;
+
+@ClassSubstitution(className = "java.math.BigInteger", optional = true)
+public class BigIntegerSubstitutions {
+
+    @MethodSubstitution(isStatic = false)
+    static int[] multiplyToLen(@SuppressWarnings("unused") Object receiver, int[] x, int xlen, int[] y, int ylen, int[] zIn) {
+        return multiplyToLenStatic(x, xlen, y, ylen, zIn);
+    }
+
+    @MethodSubstitution(isStatic = true)
+    static int[] multiplyToLenStatic(int[] x, int xlen, int[] y, int ylen, int[] zIn) {
+        int[] zResult = zIn;
+        int zLen;
+        if (zResult == null || zResult.length < (xlen + ylen)) {
+            zLen = xlen + ylen;
+            zResult = new int[xlen + ylen];
+        } else {
+            zLen = zIn.length;
+        }
+        HotSpotBackend.multiplyToLenStub(arrayStart(x), xlen, arrayStart(y), ylen, arrayStart(zResult), zLen);
+        return zResult;
+    }
+
+    @MethodSubstitution(isStatic = true)
+    static int mulAdd(int[] out, int[] in, int offset, int len, int k) {
+        int[] outNonNull = GraalDirectives.guardingNonNull(out);
+        int newOffset = outNonNull.length - offset;
+        return HotSpotBackend.mulAddStub(arrayStart(outNonNull), arrayStart(in), newOffset, len, k);
+    }
+
+    @MethodSubstitution(isStatic = true)
+    static int implMulAdd(int[] out, int[] in, int offset, int len, int k) {
+        int[] outNonNull = GraalDirectives.guardingNonNull(out);
+        int newOffset = outNonNull.length - offset;
+        return HotSpotBackend.mulAddStub(arrayStart(outNonNull), arrayStart(in), newOffset, len, k);
+    }
+
+    @MethodSubstitution(isStatic = true)
+    static int[] implMontgomeryMultiply(int[] a, int[] b, int[] n, int len, long inv, int[] product) {
+        HotSpotBackend.implMontgomeryMultiply(arrayStart(a), arrayStart(b), arrayStart(n), len, inv, arrayStart(product));
+        return product;
+
+    }
+
+    @MethodSubstitution(isStatic = true)
+    static int[] implMontgomerySquare(int[] a, int[] n, int len, long inv, int[] product) {
+        HotSpotBackend.implMontgomerySquare(arrayStart(a), arrayStart(n), len, inv, arrayStart(product));
+        return product;
+    }
+
+    @MethodSubstitution(isStatic = true)
+    static int[] implSquareToLen(int[] x, int len, int[] z, int zLen) {
+        HotSpotBackend.implSquareToLen(arrayStart(x), len, arrayStart(z), zLen);
+        return z;
+    }
+
+}