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8026049: (bf) Intrinsify ByteBuffer.put{Int, Double, Float, ...} methods

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Use unaligned Unsafe loads and stores for ByteBuffer access on platforms which support unaligned access. Add intrinsics for Unsafe.{get,put}-X-Unaligned methods.

Reviewed-by: dholmes, jrose, psandoz, kvn
This commit is contained in:
Andrew Haley 2015-03-31 12:31:18 -07:00
parent 61aa1cfdef
commit 1dfbc44c1f
11 changed files with 486 additions and 7 deletions
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9
hotspot/src/cpu/sparc/vm/vm_version_sparc.cpp
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@ -1,5 +1,5 @@
/*
* Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 1997, 2015, 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
@ -356,6 +356,13 @@ void VM_Version::initialize() {
(cache_line_size > ContendedPaddingWidth))
ContendedPaddingWidth = cache_line_size;
// This machine does not allow unaligned memory accesses
if (UseUnalignedAccesses) {
if (!FLAG_IS_DEFAULT(UseUnalignedAccesses))
warning("Unaligned memory access is not available on this CPU");
FLAG_SET_DEFAULT(UseUnalignedAccesses, false);
}
#ifndef PRODUCT
if (PrintMiscellaneous && Verbose) {
tty->print_cr("L1 data cache line size: %u", L1_data_cache_line_size());