EdkCompatibilityPkg/Foundation/Library/EdkIIGlueLib/Library/BaseLib/Ia32/RShiftU64.c

   1 /*++
   2
   3 Copyright (c) 2004 - 2006, Intel Corporation. All rights reserved.<BR>
   4 This program and the accompanying materials
   5 are licensed and made available under the terms and conditions of the BSD License
   6 which accompanies this distribution.  The full text of the license may be found at
   7 http://opensource.org/licenses/bsd-license.php
   8
   9 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  10 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  11
  12
  13 Module Name:
  14
  15   RShiftU64.c
  16
  17 Abstract:
  18
  19
  20
  21 --*/
  22
  23 #include "BaseLibInternals.h"
  24
  25 UINT64
  26 EFIAPI
  27 InternalMathRShiftU64 (
  28   IN      UINT64                    Operand,
  29   IN      UINTN                     Count
  30   )
  31 {
  32   _asm {
  33     mov     cl, byte ptr [Count]
  34     xor     edx, edx
  35     mov     eax, dword ptr [Operand + 4]
  36     test    cl, 32
  37     cmovz   edx, eax
  38     cmovz   eax, dword ptr [Operand + 0]
  39     shrd    eax, edx, cl
  40     shr     edx, cl
  41   }
  42 }
  43