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8073184: Compile of java.lang.Integer::getChars fails with LoopLimitCheck = false after 8054478

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CastII that guards counted loops confuses range check elimination with LoopLimitCheck off

Reviewed-by: kvn, iveresov
This commit is contained in:
Roland Westrelin 2015-02-24 15:23:05 +01:00
parent 14cf940405
commit f4f9769cd2
2 changed files with 47 additions and 1 deletions
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2
hotspot/src/share/vm/opto/loopTransform.cpp
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@ -2032,7 +2032,7 @@ void PhaseIdealLoop::do_range_check( IdealLoopTree *loop, Node_List &old_new ) {
// Hopefully, compiler will optimize for powers of 2.
Node *ctrl = get_ctrl(main_limit);
Node *stride = cl->stride();
Node *init = cl->init_trip();
Node *init = cl->init_trip()->uncast();
Node *span = new SubINode(main_limit,init);
register_new_node(span,ctrl);
Node *rndup = _igvn.intcon(stride_con + ((stride_con>0)?-1:1));

46
hotspot/test/compiler/loopopts/TestCastIINoLoopLimitCheck.java Normal file
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@ -0,0 +1,46 @@
/*
* Copyright (c) 2015, 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 8073184
* @summary CastII that guards counted loops confuses range check elimination with LoopLimitCheck off
* @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:-LoopLimitCheck -XX:CompileOnly=TestCastIINoLoopLimitCheck.m -Xcomp TestCastIINoLoopLimitCheck
*
*/
public class TestCastIINoLoopLimitCheck {
static void m(int i, int index, char[] buf) {
while (i >= 65536) {
i = i / 100;
buf [--index] = 0;
buf [--index] = 1;
}
}
static public void main(String[] args) {
m(0, 0, null);
}
}