MdePkg/Library/BaseLib/Ia32/LRotU64.asm

   1 ;------------------------------------------------------------------------------
   2 ;
   3 ; Copyright (c) 2006 - 2015, 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 ; Module Name:
  13 ;
  14 ;   LRotU64.asm
  15 ;
  16 ; Abstract:
  17 ;
  18 ;   64-bit left rotation for Ia32
  19 ;
  20 ;------------------------------------------------------------------------------
  21
  22     .686
  23     .model  flat,C
  24     .code
  25
  26 ;------------------------------------------------------------------------------
  27 ; UINT64
  28 ; EFIAPI
  29 ; InternalMathLRotU64 (
  30 ;   IN      UINT64                    Operand,
  31 ;   IN      UINTN                     Count
  32 ;   );
  33 ;------------------------------------------------------------------------------
  34 InternalMathLRotU64 PROC    USES    ebx
  35     mov     cl, [esp + 16]
  36     mov     edx, [esp + 12]
  37     mov     eax, [esp + 8]
  38     shld    ebx, edx, cl
  39     shld    edx, eax, cl
  40     ror     ebx, cl
  41     shld    eax, ebx, cl
  42     test    cl, 32                      ; Count >= 32?
  43     jz      @F
  44     mov     ecx, eax
  45     mov     eax, edx
  46     mov     edx, ecx
  47 @@:
  48     ret
  49 InternalMathLRotU64 ENDP
  50
  51     END