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jdk-24/test/hotspot/jtreg/compiler/regalloc/TestNodeRegArrayOverflow.java
Roberto Castañeda Lozano a5818972c1 8317507: C2 compilation fails with "Exceeded _node_regs array" 
Co-authored-by: Tobias Hartmann <thartmann@openjdk.org>
Reviewed-by: thartmann, shade, dlong
2023-10-30 12:54:03 +00:00

600 lines
12 KiB
Java
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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.
*/
package compiler.regalloc;
/**
* @test
* @bug 8317507
* @summary Test that C2's PhaseRegAlloc::_node_regs (a post-register-allocation
* mapping from machine nodes to assigned registers) does not overflow
* in the face of a program with a high-density of CISC spilling
* candidate nodes.
* @run main/othervm -Xcomp -XX:CompileOnly=compiler.regalloc.TestNodeRegArrayOverflow::testWithCompilerUnrolling
-XX:CompileCommand=dontinline,compiler.regalloc.TestNodeRegArrayOverflow::dontInline
compiler.regalloc.TestNodeRegArrayOverflow compiler
* @run main/othervm -Xcomp -XX:CompileOnly=compiler.regalloc.TestNodeRegArrayOverflow::testWithManualUnrolling
-XX:CompileCommand=dontinline,compiler.regalloc.TestNodeRegArrayOverflow::dontInline
compiler.regalloc.TestNodeRegArrayOverflow manual
*/
public class TestNodeRegArrayOverflow {
static int dontInline() {
return 0;
}
static float testWithCompilerUnrolling(float inc) {
int i = 0, j = 0;
// This non-inlined method call causes 'inc' to be spilled.
float f = dontInline();
// This two-level reduction loop is unrolled 512 times, which is
// requested by the SLP-specific unrolling analysis, but not vectorized.
// Because 'inc' is spilled, each of the unrolled AddF nodes is
// CISC-spill converted (PhaseChaitin::fixup_spills()). Before the fix,
// this causes the unique node index counter (Compile::_unique) to grow
// beyond the size of the node register array
// (PhaseRegAlloc::_node_regs), and leads to overflow when accessed for
// nodes that are created later (e.g. during the peephole phase).
while (i++ < 128) {
for (j = 0; j < 16; j++) {
f += inc;
}
}
return f;
}
// This test reproduces the same failure as 'testWithCompilerUnrolling'
// without relying on loop transformations.
static float testWithManualUnrolling(float inc) {
int i = 0, j = 0;
float f = dontInline();
f += inc;
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return f;
}
public static void main(String[] args) {
switch (args[0]) {
case "compiler":
testWithCompilerUnrolling(0);
break;
case "manual":
testWithManualUnrolling(0);
break;
default:
throw new IllegalArgumentException("Invalid mode: " + args[0]);
}
}
}
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