diff -r 000000000000 -r f90c822e73f8 test/compiler/6921969/TestMultiplyLongHiZero.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/compiler/6921969/TestMultiplyLongHiZero.java	Wed Apr 27 01:25:04 2016 +0800
@@ -0,0 +1,138 @@
+/*
+ * Copyright 2010 Google, Inc.  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.
+ *
+ */
+
+/*
+ * @test
+ * @bug 6921969
+ * @summary Tests shorter long multiply sequences when the high 32 bits of long operands are known to be zero on x86_32
+ * @run main/othervm -Xbatch -XX:-Inline -XX:CompileOnly=.testNormal,.testLeftOptimized,.testRightOptimized,.testOptimized,.testLeftOptimized_LoadUI2L,.testRightOptimized_LoadUI2L,.testOptimized_LoadUI2L TestMultiplyLongHiZero
+ */
+
+// This test must run without any command line arguments.
+
+public class TestMultiplyLongHiZero {
+
+  private static void check(long leftFactor, long rightFactor, long optimizedProduct, long constantProduct) {
+    long normalProduct = leftFactor * rightFactor; // unaffected by the new optimization
+    if (optimizedProduct != constantProduct || normalProduct != constantProduct) {
+      throw new RuntimeException("Not all three products are equal: " +
+                                 Long.toHexString(normalProduct) + ", " +
+                                 Long.toHexString(optimizedProduct) + ", " +
+                                 Long.toHexString(constantProduct));
+    }
+  }
+
+  private static int initInt(String[] args, int v) {
+    if (args.length > 0) {
+      try {
+        return Integer.valueOf(args[0]);
+      } catch (NumberFormatException e) { }
+    }
+    return v;
+  }
+
+  private static final long mask32 = 0x00000000FFFFFFFFL;
+
+  private static void testNormal(int leftFactor, int rightFactor, long constantProduct) {
+    check((long) leftFactor,
+          (long) rightFactor,
+          (long) leftFactor * (long) rightFactor, // unaffected by the new optimization
+          constantProduct);
+  }
+
+  private static void testLeftOptimized(int leftFactor, int rightFactor, long constantProduct) {
+    check((leftFactor & mask32),
+          (long) rightFactor,
+          (leftFactor & mask32) * (long) rightFactor, // left factor optimized
+          constantProduct);
+  }
+
+  private static void testRightOptimized(int leftFactor, int rightFactor, long constantProduct) {
+    check((long) leftFactor,
+          (rightFactor & mask32),
+          (long) leftFactor * (rightFactor & mask32), // right factor optimized
+          constantProduct);
+  }
+
+  private static void testOptimized(int leftFactor, int rightFactor, long constantProduct) {
+    check((leftFactor & mask32),
+          (rightFactor & mask32),
+          (leftFactor & mask32) * (rightFactor & mask32), // both factors optimized
+          constantProduct);
+  }
+
+  private static void testLeftOptimized_LoadUI2L(int leftFactor, int rightFactor, long constantProduct, int[] factors) {
+    check((leftFactor & mask32),
+          (long) rightFactor,
+          (factors[0] & mask32) * (long) rightFactor, // left factor optimized
+          constantProduct);
+  }
+
+  private static void testRightOptimized_LoadUI2L(int leftFactor, int rightFactor, long constantProduct, int[] factors) {
+    check((long) leftFactor,
+          (rightFactor & mask32),
+          (long) leftFactor * (factors[1] & mask32), // right factor optimized
+          constantProduct);
+  }
+
+  private static void testOptimized_LoadUI2L(int leftFactor, int rightFactor, long constantProduct, int[] factors) {
+    check((leftFactor & mask32),
+          (rightFactor & mask32),
+          (factors[0] & mask32) * (factors[1] & mask32), // both factors optimized
+          constantProduct);
+  }
+
+  private static void test(int leftFactor, int rightFactor,
+                           long normalConstantProduct,
+                           long leftOptimizedConstantProduct,
+                           long rightOptimizedConstantProduct,
+                           long optimizedConstantProduct) {
+    int[] factors = new int[2];
+    factors[0] = leftFactor;
+    factors[1] = rightFactor;
+    testNormal(leftFactor, rightFactor, normalConstantProduct);
+    testLeftOptimized(leftFactor, rightFactor, leftOptimizedConstantProduct);
+    testRightOptimized(leftFactor, rightFactor, rightOptimizedConstantProduct);
+    testOptimized(leftFactor, rightFactor, optimizedConstantProduct);
+    testLeftOptimized_LoadUI2L(leftFactor, rightFactor, leftOptimizedConstantProduct, factors);
+    testRightOptimized_LoadUI2L(leftFactor, rightFactor, rightOptimizedConstantProduct, factors);
+    testOptimized_LoadUI2L(leftFactor, rightFactor, optimizedConstantProduct, factors);
+  }
+
+  public static void main(String[] args) {
+    for (int i = 0; i < 100000; ++i) { // Trigger compilation
+      int i0 = initInt(args, 1);
+      int i1 = initInt(args, 3);
+      int i2 = initInt(args, -1);
+      int i3 = initInt(args, 0x7FFFFFFF);
+      test(i0, i1, 3L, 3L, 3L, 3L);
+      test(i0, i2, -1L, -1L, 0xFFFFFFFFL, 0xFFFFFFFFL);
+      test(i0, i3, 0x7FFFFFFFL, 0x7FFFFFFFL, 0x7FFFFFFFL, 0x7FFFFFFFL);
+      test(i1, i2, -3L, -3L, 0x2FFFFFFFDL, 0x2FFFFFFFDL);
+      test(i1, i3, 0x17FFFFFFDL, 0x17FFFFFFDL, 0x17FFFFFFDL, 0x17FFFFFFDL);
+      test(i2, i3, 0xFFFFFFFF80000001L, 0x7FFFFFFE80000001L,
+           0xFFFFFFFF80000001L, 0x7FFFFFFE80000001L);
+    }
+  }
+}