Optimize the size of the Base Library for the MSFT 32-bit tool chains by taking advan...

[mirror_edk2.git] / MdePkg / Library / BaseLib / Ia32 / InterlockedCompareExchange64.c

/** @file\r
  InterlockedCompareExchange64 function\r
\r
  Copyright (c) 2006, Intel Corporation<BR>\r
  All rights reserved. This program and the accompanying materials\r
  are licensed and made available under the terms and conditions of the BSD License\r
  which accompanies this distribution.  The full text of the license may be found at\r
  http://opensource.org/licenses/bsd-license.php\r
\r
  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
\r
**/\r
\r
#if _MSC_EXTENSIONS\r
\r
UINT64\r
EFIAPI\r
InternalSyncCompareExchange64 (\r
  IN      UINT64                    *Value,\r
  IN      UINT64                    CompareValue,\r
  IN      UINT64                    ExchangeValue\r
  )\r
{\r
  _asm {\r
    mov     esi, Value\r
    mov     eax, dword ptr [CompareValue + 0]\r
    mov     edx, dword ptr [CompareValue + 4]\r
    mov     ebx, dword ptr [ExchangeValue + 0]\r
    mov     ecx, dword ptr [ExchangeValue + 4]\r
    lock    cmpxchg8b   qword ptr [esi]\r
  }\r
}\r
\r
#endif\r