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8166742: SIGFPE in C2 Loop IV elimination

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Reviewed-by: kvn
This commit is contained in:
Chuck Rasbold 2016-09-28 10:11:40 -07:00
parent 25017eef2c
commit f99a7c05c4
2 changed files with 57 additions and 0 deletions
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6
hotspot/src/share/vm/opto/loopnode.cpp
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@ -1687,6 +1687,12 @@ void PhaseIdealLoop::replace_parallel_iv(IdealLoopTree *loop) {
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

51
hotspot/test/compiler/loopopts/TestImpossibleIV.java Normal file
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@ -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();
}
}