Mercurial > hg > graal-compiler
diff test/compiler/6956668/Test6956668.java @ 3416:f88fb2fa90cf
6956668: misbehavior of XOR operator (^) with int
Summary: optimize cmp_ne(xor(X,1),0) to cmp_eq(X,0) only for boolean values X.
Reviewed-by: never
author | kvn |
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date | Tue, 31 May 2011 10:05:36 -0700 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/test/compiler/6956668/Test6956668.java Tue May 31 10:05:36 2011 -0700 @@ -0,0 +1,69 @@ +/* + * Copyright (c) 2011, 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 6956668 + * @summary misbehavior of XOR operator (^) with int + * + * @run main/othervm -Xbatch Test6956668 + */ + + +public class Test6956668 { + + public static int bitTest() { + int result = 0; + + int testValue = 73; + int bitCount = Integer.bitCount(testValue); + + if (testValue != 0) { + int gap = Long.numberOfTrailingZeros(testValue); + testValue >>>= gap; + + while (testValue != 0) { + result++; + + if ((testValue ^= 0x1) != 0) { + gap = Long.numberOfTrailingZeros(testValue); + testValue >>>= gap; + } + } + } + + if (bitCount != result) { + System.out.println("ERROR: " + bitCount + " != " + result); + System.exit(97); + } + + return (result); + } + + public static void main(String[] args) { + for (int i = 0; i < 100000; i++) { + int ct = bitTest(); + } + } +}