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8254998: C2: assert(!n->as_Loop()->is_transformed_long_loop()) failur…
…e with -XX:StressLongCountedLoop=1

Reviewed-by: vlivanov, kvn, thartmann
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rwestrel committed Oct 20, 2020
1 parent 3ee0380 commit 294e0705faf40e8fe5989a19f464c0739790e7e3
Showing with 56 additions and 1 deletion.
  1. +1 −1 src/hotspot/share/opto/compile.cpp
  2. +55 −0 test/hotspot/jtreg/compiler/longcountedloops/TestTooManyLoopOpts.java
@@ -3428,7 +3428,7 @@ void Compile::final_graph_reshaping_main_switch(Node* n, Final_Reshape_Counts& f
}
break;
case Op_Loop:
assert(!n->as_Loop()->is_transformed_long_loop(), "should have been turned into a counted loop");
assert(!n->as_Loop()->is_transformed_long_loop() || _loop_opts_cnt == 0, "should have been turned into a counted loop");
case Op_CountedLoop:
case Op_OuterStripMinedLoop:
if (n->as_Loop()->is_inner_loop()) {
@@ -0,0 +1,55 @@
/*
* Copyright (c) 2020, Red Hat, 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 8254998
* @summary C2: assert(!n->as_Loop()->is_transformed_long_loop()) failure with -XX:StressLongCountedLoop=1
* @requires vm.compiler2.enabled & vm.gc.Parallel
*
* @run main/othervm -Xcomp -XX:-TieredCompilation -XX:MaxRecursiveInlineLevel=26 -XX:MaxInlineLevel=26 -XX:LoopOptsCount=41 -XX:+UseParallelGC TestTooManyLoopOpts
*
*/

public class TestTooManyLoopOpts {
private static volatile int field;

public static void main(String[] args) {
test(0);
}

private static void test(int stop) {
for (long l = 0; l < 10; l++) {
test_helper(stop, 26);
field = 0x42;
}
}
private static void test_helper(int stop, int rec) {
if (rec <= 0) {
return;
}
for (int i = 0; i < stop; i++) {
test_helper(stop, rec - 1);
}
}
}

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