Moved the MdePkg to OldMdePkg so that new code in MdePkg does not break existing...

[mirror_edk2.git] / OldMdePkg / Library / BaseLib / Ia32 / RShiftU64.c

/** @file\r
  64-bit logical right shift function for IA-32\r
\r
  Copyright (c) 2006 - 2007, 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
UINT64\r
EFIAPI\r
InternalMathRShiftU64 (\r
  IN      UINT64                    Operand,\r
  IN      UINTN                     Count\r
  )\r
{\r
  _asm {\r
    mov     cl, byte ptr [Count]\r
    xor     edx, edx\r
    mov     eax, dword ptr [Operand + 4]\r
    test    cl, 32\r
    cmovz   edx, eax\r
    cmovz   eax, dword ptr [Operand + 0]\r
    shrd    eax, edx, cl\r
    shr     edx, cl\r
  }\r
}\r
\r