MdePkg/Library/BaseLib/Ia32/RShiftU64.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 #   RShiftU64.asm
  15 #
  16 # Abstract:
  17 #
  18 #   64-bit logical right shift function for IA-32
  19 #
  20 #------------------------------------------------------------------------------
  21
  22     .686:
  23     .code:
  24
  25 .global InternalMathRShiftU64
  26 _InternalMathRShiftU64:
  27     movb    12(%esp),%cl
  28     xorl    %edx,%edx
  29     movl    8(%esp),%eax
  30     testb   $32,%cl
  31     cmovz   %eax, %edx
  32     cmovz   0x4(%esp), %eax
  33     shrdl   %cl,%edx,%eax
  34     shr     %cl,%edx
  35     ret