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8031743: C2: loadI2L_immI broken for negative memory values

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Restrict loadI2L_imm optimizations to positive values of mask

Reviewed-by: kvn, dlong
This commit is contained in:
Igor Veresov 2014-01-21 20:05:28 -08:00
parent 2275de8d6b
commit 0c43978be6
4 changed files with 103 additions and 15 deletions
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55
hotspot/test/compiler/codegen/LoadWithMask2.java Normal file
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@ -0,0 +1,55 @@
/*
* Copyright (c) 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.
*/
/*
* @test
* @bug 8031743
* @summary loadI2L_immI broken for negative memory values
* @run main/othervm -server -Xbatch -XX:-TieredCompilation -XX:CompileCommand=compileonly,*.foo* LoadWithMask2
*
*/
public class LoadWithMask2 {
static int x;
static long foo1() {
return x & 0xfffffffe;
}
static long foo2() {
return x & 0xff000000;
}
static long foo3() {
return x & 0x8abcdef1;
}
public static void main(String[] args) {
x = -1;
long l = 0;
for (int i = 0; i < 100000; ++i) {
l = foo1() & foo2() & foo3();
}
if (l > 0) {
System.out.println("FAILED");
System.exit(97);
}
System.out.println("PASSED");
}
}