MdePkg/Library/BaseLib/ia32/RRotU64.s

   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 #   RRotU64.asm
  15 #
  16 # Abstract:
  17 #
  18 #   64-bit right rotation for Ia32
  19 #
  20 #------------------------------------------------------------------------------
  21
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  24
  25
  26 .global _RRotU64
  27     push    %ebx
  28     movb    16(%esp),%cl
  29     movl    8(%esp),%eax
  30     movl    12(%esp),%edx
  31     shrdl   %cl,%eax,%ebx
  32     shrdl   %cl,%edx,%eax
  33     roll    %cl,%ebx
  34     shrdl   %cl,%ebx,%edx
  35     testb   $32,%cl
  36     cmovnz  %eax, %ecx
  37     cmovnz  %edx, %eax
  38     cmovnz  %ecx, %edx
  39     pop     %ebx
  40     ret
  41
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  43