OpenJDK / amber / amber
changeset 41696:578189b0f230
8166742: SIGFPE in C2 Loop IV elimination
Reviewed-by: kvn
author | rasbold |
---|---|
date | Wed, 28 Sep 2016 10:11:40 -0700 |
parents | 1faafa135782 |
children | 94ef14db8a20 |
files | hotspot/src/share/vm/opto/loopnode.cpp hotspot/test/compiler/loopopts/TestImpossibleIV.java |
diffstat | 2 files changed, 57 insertions(+), 0 deletions(-) [+] |
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--- a/hotspot/src/share/vm/opto/loopnode.cpp Tue Sep 27 04:48:51 2016 -0700 +++ b/hotspot/src/share/vm/opto/loopnode.cpp Wed Sep 28 10:11:40 2016 -0700 @@ -1687,6 +1687,12 @@ Node *init2 = phi2->in( LoopNode::EntryControl ); int stride_con2 = incr2->in(2)->get_int(); + // The ratio of the two strides cannot be represented as an int + // if stride_con2 is min_int and stride_con is -1. + if (stride_con2 == min_jint && stride_con == -1) { + continue; + } + // The general case here gets a little tricky. We want to find the // GCD of all possible parallel IV's and make a new IV using this // GCD for the loop. Then all possible IVs are simple multiples of
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/hotspot/test/compiler/loopopts/TestImpossibleIV.java Wed Sep 28 10:11:40 2016 -0700 @@ -0,0 +1,51 @@ +/* + * Copyright 2016 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 8166742 + * @summary C2 IV elimination throws FPE + * @run main/othervm -XX:-TieredCompilation -XX:-BackgroundCompilation TestImpossibleIV + * @author Chuck Rasbold rasbold@google.com + */ + +/* + * Use -XX:-TieredCompilation to get C2 only. + * Use -XX:-BackgroundCompilation to wait for compilation before test exit. + */ + +public class TestImpossibleIV { + + static private void testMethod() { + int sum = 0; + // A unit count-down loop which has an induction variable with + // MIN_VALUE stride. + for (int i = 100000; i >= 0; i--) { + sum += Integer.MIN_VALUE; + } + } + + public static void main(String[] args) { + testMethod(); + } +}