hotspot/src/cpu/x86/vm/globalDefinitions_x86.hpp
author dcubed
Tue, 14 Oct 2014 10:32:12 -0700
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8049737: Contended Locking reorder and cache line bucket Summary: JEP-143/JDK-8046133 - optimization #1 - reorder and cache line bucket. Reviewed-by: shade, dice, dholmes, dsimms Contributed-by: dave.dice@oracle.com, karen.kinnear@oracle.com, daniel.daugherty@oracle.com
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/*
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 * Copyright (c) 1999, 2014, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#ifndef CPU_X86_VM_GLOBALDEFINITIONS_X86_HPP
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#define CPU_X86_VM_GLOBALDEFINITIONS_X86_HPP
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const int StackAlignmentInBytes  = 16;
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// Indicates whether the C calling conventions require that
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// 32-bit integer argument values are properly extended to 64 bits.
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// If set, SharedRuntime::c_calling_convention() must adapt
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// signatures accordingly.
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const bool CCallingConventionRequiresIntsAsLongs = false;
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#define SUPPORTS_NATIVE_CX8
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// The expected size in bytes of a cache line, used to pad data structures.
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#if defined(TIERED)
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  #ifdef _LP64
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    // tiered, 64-bit, large machine
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    #define DEFAULT_CACHE_LINE_SIZE 128
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  #else
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    // tiered, 32-bit, medium machine
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    #define DEFAULT_CACHE_LINE_SIZE 64
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  #endif
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#elif defined(COMPILER1)
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  // pure C1, 32-bit, small machine
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  // i486 was the last Intel chip with 16-byte cache line size
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  #define DEFAULT_CACHE_LINE_SIZE 32
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#elif defined(COMPILER2) || defined(SHARK)
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  #ifdef _LP64
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    // pure C2, 64-bit, large machine
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    #define DEFAULT_CACHE_LINE_SIZE 128
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  #else
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    // pure C2, 32-bit, medium machine
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    #define DEFAULT_CACHE_LINE_SIZE 64
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  #endif
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#endif
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#endif // CPU_X86_VM_GLOBALDEFINITIONS_X86_HPP