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8299179: ArrayFill with store on backedge needs to reduce length by 1
Backport-of: d716ec5d3034240b7dd0aed86d9bb371bc3e5f5a
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test/hotspot/jtreg/compiler/loopopts/TestBackedgeLoadArrayFill.jasm
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/* | ||
* Copyright (c) 2023, 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. | ||
* | ||
*/ | ||
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super public class TestBackedgeLoadArrayFill | ||
{ | ||
public Method "<init>":"()V" | ||
stack 2 locals 1 | ||
{ | ||
aload_0; | ||
invokespecial Method java/lang/Object."<init>":"()V"; | ||
return; | ||
} | ||
|
||
static Method test_101:"()V" | ||
stack 20 locals 20 | ||
{ | ||
// test_002 in jasm: using try-catch | ||
ldc 6; | ||
istore_0; // i = 6 | ||
ldc 25; | ||
newarray int; | ||
astore_1; // arr = new int[25] | ||
HEAD: | ||
aload_1; | ||
iload_0; | ||
iconst_1; | ||
iastore; // arr[i] = 1 | ||
// second block - the only one -> head block can be copied: one before, one on backedge | ||
try t0; | ||
aload_1; | ||
iload_0; | ||
aload_1; | ||
iload_0; | ||
iaload; | ||
iastore; // arr[i] = arr[i] | ||
goto FINALLY; | ||
endtry t0; | ||
catch t0 java/lang/Exception; | ||
pop; // exception | ||
FINALLY: | ||
iinc 0, 1; // i++ | ||
iload_0; | ||
ldc 21; | ||
if_icmplt HEAD; // if i < 21 | ||
// write array | ||
aload_1; | ||
putstatic Field TestBackedgeLoadArrayFillMain.intA:"[I"; | ||
return; | ||
} | ||
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static Method test_102:"()V" | ||
stack 20 locals 20 | ||
{ | ||
// test_002 in jasm: without try-catch | ||
ldc 5; | ||
istore_0; // i = 5 | ||
ldc 25; | ||
newarray int; | ||
astore_1; // arr = new int[25] | ||
HEAD: | ||
aload_1; | ||
iload_0; | ||
iconst_1; | ||
iastore; // arr[i] = 1 | ||
goto SECOND; | ||
// second block - the only one -> head block can be copied: one before, one on backedge | ||
// must have some material before inc, else it is partial peeled away | ||
// And if we set -XX:-PartialPeelLoop, then the counted loop is never detected | ||
SECOND: | ||
aload_1; | ||
iload_0; | ||
aload_1; | ||
iload_0; | ||
iaload; | ||
iastore; // arr[i] = arr[i] | ||
iinc 0, 1; // i++ | ||
iload_0; | ||
ldc 21; | ||
if_icmplt HEAD; // if i < 21 | ||
// write array | ||
aload_1; | ||
putstatic Field TestBackedgeLoadArrayFillMain.intA:"[I"; | ||
return; | ||
} | ||
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static Method test_103:"()V" | ||
stack 20 locals 20 | ||
{ | ||
// test_002 in jasm: without try-catch, and second array | ||
ldc 7; | ||
istore_0; // i = 7 | ||
ldc 25; | ||
newarray int; | ||
astore_1; // arr = new int[25] | ||
ldc 25; | ||
newarray int; | ||
astore_2; // arr2 = new int[25] | ||
HEAD: | ||
aload_1; | ||
iload_0; | ||
iconst_1; | ||
iastore; // arr[i] = 1 | ||
goto SECOND; | ||
// second block - the only one -> head block can be copied: one before, one on backedge | ||
SECOND: | ||
// we can also do the identity read-write on another array - it just has to eventually disappear | ||
aload_2; | ||
iload_0; | ||
aload_2; | ||
iload_0; | ||
iaload; | ||
iastore; // arr2[i] = arr2[i] | ||
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iinc 0, 1; // i++ | ||
iload_0; | ||
ldc 21; | ||
if_icmplt HEAD; // if i < 21 | ||
// write array | ||
aload_1; | ||
putstatic Field TestBackedgeLoadArrayFillMain.intA:"[I"; | ||
return; | ||
} | ||
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static Method test_104:"()V" | ||
stack 20 locals 20 | ||
{ | ||
ldc 9; | ||
istore_0; // i = 9 | ||
ldc 25; | ||
newarray int; | ||
astore_1; // arr = new int[25] | ||
HEAD: | ||
aload_1; | ||
iload_0; | ||
iconst_1; | ||
iastore; // arr[i] = 1 | ||
goto SECOND; | ||
// second block - the only one -> head block can be copied: one before, one on backedge | ||
SECOND: | ||
// CFG leads to partial peel -> load moved into loop body, then intrinsified | ||
iload_0; | ||
ldc 2; | ||
irem; | ||
ifeq SKIP; | ||
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SKIP: | ||
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iinc 0, 1; // i++ | ||
iload_0; | ||
ldc 21; | ||
if_icmplt HEAD; // if i < 21 | ||
// write array | ||
aload_1; | ||
putstatic Field TestBackedgeLoadArrayFillMain.intA:"[I"; | ||
return; | ||
} | ||
} |
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