hotspot/src/cpu/x86/vm/globalDefinitions_x86.hpp

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
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 *
 * 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.
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#ifndef CPU_X86_VM_GLOBALDEFINITIONS_X86_HPP
#define CPU_X86_VM_GLOBALDEFINITIONS_X86_HPP

const int StackAlignmentInBytes  = 16;

// Indicates whether the C calling conventions require that
// 32-bit integer argument values are extended to 64 bits.
const bool CCallingConventionRequiresIntsAsLongs = false;

#define SUPPORTS_NATIVE_CX8

// The expected size in bytes of a cache line, used to pad data structures.
#if defined(TIERED)
  #ifdef _LP64
    // tiered, 64-bit, large machine
    #define DEFAULT_CACHE_LINE_SIZE 128
  #else
    // tiered, 32-bit, medium machine
    #define DEFAULT_CACHE_LINE_SIZE 64
  #endif
#elif defined(COMPILER1)
  // pure C1, 32-bit, small machine
  // i486 was the last Intel chip with 16-byte cache line size
  #define DEFAULT_CACHE_LINE_SIZE 32
#elif defined(COMPILER2) || defined(SHARK)
  #ifdef _LP64
    // pure C2, 64-bit, large machine
    #define DEFAULT_CACHE_LINE_SIZE 128
  #else
    // pure C2, 32-bit, medium machine
    #define DEFAULT_CACHE_LINE_SIZE 64
  #endif
#endif

#if defined(COMPILER2) && !defined(JAVASE_EMBEDDED)
// Include Restricted Transactional Memory lock eliding optimization
#define INCLUDE_RTM_OPT 1
#endif

#if defined(LINUX) || defined(SOLARIS) || defined(__APPLE__)
#define SUPPORT_RESERVED_STACK_AREA
#endif

#endif // CPU_X86_VM_GLOBALDEFINITIONS_X86_HPP