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8348678: [PPC64] C2: unaligned vector load/store is ok

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8343906: test2 of compiler/c2/TestCastX2NotProcessedIGVN.java fails on some platforms

Reviewed-by: mdoerr, amitkumar
This commit is contained in:
Richard Reingruber 2025-02-11 07:45:55 +00:00
parent 41bdc47d71
commit 1a8212e101
3 changed files with 12 additions and 7 deletions
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10
src/hotspot/cpu/ppc/matcher_ppc.hpp
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2021, 2024, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2021, 2025, 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
@ -37,10 +37,12 @@
return false;
}
// PPC implementation uses VSX load/store instructions (if
// SuperwordUseVSX) which support 4 byte but not arbitrary alignment
// The PPC implementation uses VSX lxvd2x/stxvd2x instructions (if
// SuperwordUseVSX). They do not have alignment requirements.
// Some VSX storage access instructions cannot encode arbitrary displacements
// (e.g. lxv). None of them is currently used.
static constexpr bool misaligned_vectors_ok() {
return false;
return true;
}
// Whether code generation need accurate ConvI2L types.

5
src/hotspot/cpu/ppc/vm_version_ppc.cpp
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@ -1,6 +1,6 @@
/*
* Copyright (c) 1997, 2025, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2012, 2024 SAP SE. All rights reserved.
* Copyright (c) 2012, 2025 SAP SE. 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
@ -131,6 +131,9 @@ void VM_Version::initialize() {
}
}
MaxVectorSize = SuperwordUseVSX ? 16 : 8;
if (FLAG_IS_DEFAULT(AlignVector)) {
FLAG_SET_ERGO(AlignVector, false);
}
if (PowerArchitecturePPC64 >= 9) {
if (FLAG_IS_DEFAULT(UseCountTrailingZerosInstructionsPPC64)) {

4
test/hotspot/jtreg/compiler/c2/TestCastX2NotProcessedIGVN.java
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@ -1,6 +1,6 @@
/*
* Copyright (c) 2024, Red Hat, Inc. All rights reserved.
* Copyright (c) 2024, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2024, 2025, 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
@ -77,7 +77,7 @@ public class TestCastX2NotProcessedIGVN {
@Test
@IR(counts = {IRNode.LOAD_VECTOR_I, "> 1"},
applyIfOr = {"UseCompactObjectHeaders", "false", "AlignVector", "false"},
applyIfPlatformOr = {"x64", "true", "aarch64", "true"})
applyIfPlatformOr = {"x64", "true", "aarch64", "true", "ppc", "true"})
public static int test2(int stop, int[] array) {
int v = 0;
stop = Math.min(stop, Integer.MAX_VALUE / 4);