97 lines
2.5 KiB
Plaintext
97 lines
2.5 KiB
Plaintext
/*
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* Copyright (c) 2022, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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super public class TestOnlyInfiniteLoops
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{
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public Method "<init>":"()V"
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stack 2 locals 1
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{
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aload_0;
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invokespecial Method java/lang/Object."<init>":"()V";
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return;
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}
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static Method test_simple:"(III)I"
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stack 200 locals 10
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{
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// Nested infinite loop, where inner loop eventually
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// looses exit to outer loop. Then, the inner loop
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// floats outside the inner loop. The entry from
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// outer to inner loop now becomes an exit for the
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// outer loop, where it now enters the next loop, that
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// used to be the inner loop.
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iconst_0;
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istore 9;
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iload 0;
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ifeq LEND; // skip
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LOOP1:
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iload 1;
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ifeq LOOP1; // dominates
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LOOP2:
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// SKIP: prevent loop-exit from becoming zero-trip guard
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iload 2;
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ifeq SKIP;
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iinc 9, 1;
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SKIP:
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iload 1;
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ifeq LOOP1; // is dominated
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goto LOOP2;
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LEND:
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iload 9;
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ireturn;
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}
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static Method test_irreducible:"(IIII)V"
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stack 200 locals 200
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{
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iload_0;
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ifeq LEND; // skip
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L1:
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iload 1;
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ifgt MERGE;
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L2:
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iload 2;
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ifge MERGE;
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goto L1;
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MERGE:
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nop;
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LOOP:
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iload 3;
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ifle L2;
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iconst_0; // always true
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ifeq LOOP;
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iconst_0; // always true
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ifeq LOOP;
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INFTY:
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goto INFTY; // infinite loop
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LEND:
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return;
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}
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}
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