diff test/compiler/8005419/Test8005419.java @ 7477:038dd2875b94

8005419: Improve intrinsics code performance on x86 by using AVX2 Summary: use 256bit vpxor,vptest instructions in String.compareTo() and equals() intrinsics. Reviewed-by: twisti
author kvn
date Tue, 08 Jan 2013 11:30:51 -0800
parents
children de6a9e811145
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--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/compiler/8005419/Test8005419.java	Tue Jan 08 11:30:51 2013 -0800
@@ -0,0 +1,120 @@
+/*
+ * Copyright (c) 2012, 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.
+ */
+
+/*
+ * @test
+ * @bug 8005419
+ * @summary Improve intrinsics code performance on x86 by using AVX2
+ * @run main/othervm -Xbatch -Xmx64m Test8005419
+ *
+ */
+
+public class Test8005419 {
+    public static int SIZE = 64;
+
+    public static void main(String[] args) {
+        char[] a = new char[SIZE];
+        char[] b = new char[SIZE];
+
+        for (int i = 16; i < SIZE; i++) {
+          a[i] = (char)i;
+          b[i] = (char)i;
+        }
+        String s1 = new String(a);
+        String s2 = new String(b);
+
+        // Warm up
+        boolean failed = false;
+        int result = 0;
+        for (int i = 0; i < 10000; i++) {
+          result += test(s1, s2);
+        }
+        for (int i = 0; i < 10000; i++) {
+          result += test(s1, s2);
+        }
+        for (int i = 0; i < 10000; i++) {
+          result += test(s1, s2);
+        }
+        if (result != 0) failed = true;
+
+        System.out.println("Start testing");
+        // Compare same string
+        result = test(s1, s1);
+        if (result != 0) {
+          failed = true;
+          System.out.println("Failed same: result = " + result + ", expected 0");
+        }
+        // Compare equal strings
+        for (int i = 1; i <= SIZE; i++) {
+          s1 = new String(a, 0, i);
+          s2 = new String(b, 0, i);
+          result = test(s1, s2);
+          if (result != 0) {
+            failed = true;
+            System.out.println("Failed equals s1[" + i + "], s2[" + i + "]: result = " + result + ", expected 0");
+          }
+        }
+        // Compare equal strings but different sizes
+        for (int i = 1; i <= SIZE; i++) {
+          s1 = new String(a, 0, i);
+          for (int j = 1; j <= SIZE; j++) {
+            s2 = new String(b, 0, j);
+            result = test(s1, s2);
+            if (result != (i-j)) {
+              failed = true;
+              System.out.println("Failed diff size s1[" + i + "], s2[" + j + "]: result = " + result + ", expected " + (i-j));
+            }
+          }
+        }
+        // Compare strings with one char different and different sizes
+        for (int i = 1; i <= SIZE; i++) {
+          s1 = new String(a, 0, i);
+          for (int j = 0; j < i; j++) {
+            b[j] -= 3; // change char
+            s2 = new String(b, 0, i);
+            result = test(s1, s2);
+            int chdiff = a[j] - b[j];
+            if (result != chdiff) {
+              failed = true;
+              System.out.println("Failed diff char s1[" + i + "], s2[" + i + "]: result = " + result + ", expected " + chdiff);
+            }
+            result = test(s2, s1);
+            chdiff = b[j] - a[j];
+            if (result != chdiff) {
+              failed = true;
+              System.out.println("Failed diff char s2[" + i + "], s1[" + i + "]: result = " + result + ", expected " + chdiff);
+            }
+            b[j] += 3; // restore
+          }
+        }
+        if (failed) {
+          System.out.println("FAILED");
+          System.exit(97);
+        }
+        System.out.println("PASSED");
+    }
+
+    private static int test(String str1, String str2) {
+        return str1.compareTo(str2);
+    }
+}