EdkCompatibilityPkg/Foundation/Library/EdkIIGlueLib/Library/BaseLib/Ia32/LRotU64.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   LRotU64.c
  16
  17 Abstract:
  18
  19
  20
  21 --*/
  22
  23 #include "BaseLibInternals.h"
  24
  25 UINT64
  26 EFIAPI
  27 InternalMathLRotU64 (
  28   IN      UINT64                    Operand,
  29   IN      UINTN                     Count
  30   )
  31 {
  32   _asm {
  33     mov     cl, byte ptr [Count]
  34     mov     edx, dword ptr [Operand + 4]
  35     mov     eax, dword ptr [Operand + 0]
  36     shld    ebx, edx, cl
  37     shld    edx, eax, cl
  38     ror     ebx, cl
  39     shld    eax, ebx, cl
  40     test    cl, 32                      ; Count >= 32?
  41     cmovnz  ecx, eax
  42     cmovnz  eax, edx
  43     cmovnz  edx, ecx
  44   }
  45 }
  46