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8386656: C2 AVX512: -XX:-UseCountTrailingZerosInstruction causes assert(UseCountTrailingZerosInstruction) failed: tzcnt instruction not supported

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Reviewed-by: kvn, epeter, mhaessig, adinn
This commit is contained in:
Ashutosh Mehra 2026-06-29 14:45:38 +00:00
parent 17f2e11fe4
commit e28a58b486
2 changed files with 60 additions and 0 deletions
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7
src/hotspot/cpu/x86/x86.ad
View File

@ -3179,6 +3179,13 @@ bool Matcher::match_rule_supported(int opcode) {
break;
case Op_VectorCmpMasked:
if (!UseCountTrailingZerosInstruction) {
return false;
}
if (UseAVX < 3 || !VM_Version::supports_bmi2()) {
return false;
}
break;
case Op_VectorMaskGen:
if (UseAVX < 3 || !VM_Version::supports_bmi2()) {
return false;

53
test/hotspot/jtreg/compiler/cpuflags/TestUseCountTrailingZerosInstruction.java Normal file
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@ -0,0 +1,53 @@
/*
* Copyright (c) 2026, 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 8386656
* @summary Verify no assertions when running with -XX:-UseCountTrailingZerosInstruction
* @requires os.simpleArch == "x64"
* @run main/othervm -Xbatch -XX:-UseCountTrailingZerosInstruction ${test.main.class}
*/
/**
* @test
* @bug 8386656
* @summary Verify no assertions when running with -XX:+UseCountTrailingZerosInstruction
* @requires os.simpleArch == "x64"
* @run main/othervm -Xbatch -XX:+UseCountTrailingZerosInstruction ${test.main.class}
*/
package compiler.cpuflags;
import java.util.Arrays;
public class TestUseCountTrailingZerosInstruction {
public static void main(String[] args) {
byte[] a = new byte[32];
byte[] b = new byte[32];
for (int i = 0; i < 20_000; i++) {
Arrays.mismatch(a, b);
}
}
}