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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  23
  24
  25
  26 .global _InternalMathRRotU64
  27 _InternalMathRRotU64:
  28     push    %ebx
  29     movb    16(%esp),%cl
  30     movl    8(%esp),%eax
  31     movl    12(%esp),%edx
  32     shrdl   %cl,%eax,%ebx
  33     shrdl   %cl,%edx,%eax
  34     roll    %cl,%ebx
  35     shrdl   %cl,%ebx,%edx
  36     testb   $32,%cl
  37     cmovnz  %eax, %ecx
  38     cmovnz  %edx, %eax
  39     cmovnz  %ecx, %edx
  40     pop     %ebx
  41     ret
  42
  43
  44