jdk-24/test/hotspot/jtreg/compiler/loopopts/MalformedControlIrreducibleLoop.jasm
Roland Westrelin 690d626995 8307927: C2: "malformed control flow" with irreducible loop
Reviewed-by: thartmann, epeter
2023-06-29 07:43:46 +00:00

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/*
* Copyright (c) 2023, 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.
*/
super public class MalformedControlIrreducibleLoop
version 52:0
{
public Method "<init>":"()V"
stack 1 locals 1
{
aload_0;
invokespecial Method java/lang/Object."<init>":"()V";
return;
}
/* same as:
public static void actualTest(int flag) {
int i = 1;
int j = 1;
if (flag == 2) {
// goto second_entry;
}
loop:
for (;;) {
i = 1;
// second_entry:
do {
if (i == 1) {
continue loop; // goto loop
}
i *= 2;
j *= 2;
} while (j < 2);
break;
}
}
*/
public static Method actualTest:"(I)V"
stack 2 locals 3
{
iconst_1;
istore_1;
iconst_1;
istore_2;
iload_0;
iconst_2;
if_icmpne L11;
L9: stack_frame_type append;
locals_map int, int;
iconst_1;
istore_1;
L11: stack_frame_type same;
iload_1;
iconst_1;
if_icmpeq L9;
L19: stack_frame_type same;
iload_1;
iconst_2;
imul;
istore_1;
iload_2;
iconst_2;
imul;
istore_2;
iload_2;
iconst_2;
if_icmplt L11;
goto L35;
L35: stack_frame_type same;
return;
}
} // end Class TestMalformedControlIrreducibleLoop