Mercurial > hg > graal-compiler
diff test/compiler/rangechecks/TestRangeCheckSmearingLoopOpts.java @ 20701:b6585ac86988
8048170: Test closed/java/text/Normalizer/ConformanceTest.java failed
Summary: PhaseIdealLoop::split_if_with_blocks_post() shoulnd't reorder range checks adjusted by range check smearing
Reviewed-by: kvn, jrose
author | roland |
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date | Thu, 04 Dec 2014 14:34:11 +0100 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/test/compiler/rangechecks/TestRangeCheckSmearingLoopOpts.java Thu Dec 04 14:34:11 2014 +0100 @@ -0,0 +1,76 @@ +/* + * Copyright (c) 2014, 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 8048170 + * @summary Following range check smearing, range check cannot be replaced by dominating identical test. + * @run main/othervm -XX:-BackgroundCompilation -XX:-UseOnStackReplacement TestRangeCheckSmearingLoopOpts + * + */ +public class TestRangeCheckSmearingLoopOpts { + + static int dummy; + + static int m1(int[] array, int i) { + for (;;) { + for (;;) { + if (array[i] < 0) { // range check (i+0) dominates equivalent check below + break; + } + i++; + } + + // A control flow that stops IfNode::up_one_dom() + if ((i % 2)== 0) { + if ((array[i] % 2) == 0) { + dummy = i; + } + } + + // IfNode::Ideal will rewrite some range checks if Compile::allow_range_check_smearing + if (array[i-1] == 9) { // range check (i-1) unchanged + int res = array[i-3]; // range check (i-3) unchanged + res += array[i]; // range check (i+0) unchanged + res += array[i-2]; // removed redundant range check + // the previous access might be hoisted by + // PhaseIdealLoop::split_if_with_blocks_post because + // it appears to have the same guard, but it also + // depends on the previous guards + return res; + } + i++; + } + } + + static public void main(String[] args) { + int[] array = { 0, 1, 2, -3, 4, 5, -2, 7, 8, 9, -1 }; + for (int i = 0; i < 20000; i++) { + m1(array, 0); + } + array[0] = -1; + try { + m1(array, 0); + } catch(ArrayIndexOutOfBoundsException aioobe) {} + } +}