MdePkg/Library/BaseLib/Ia32/LRotU64.asm

   1 ;------------------------------------------------------------------------------
   2 ;
   3 ; Copyright (c) 2006, Intel Corporation
   4 ; All rights reserved. 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 InternalMathLRotU64 PROC    USES    ebx
  27     mov     cl, [esp + 16]
  28     mov     edx, [esp + 12]
  29     mov     eax, [esp + 8]
  30     shld    ebx, edx, cl
  31     shld    edx, eax, cl
  32     ror     ebx, cl
  33     shld    eax, ebx, cl
  34     test    cl, 32
  35     cmovnz  ecx, eax
  36     cmovnz  eax, edx
  37     cmovnz  edx, ecx
  38     ret
  39 InternalMathLRotU64 ENDP
  40
  41     END