MdePkg/Library/BaseLib/Ia32/LShiftU64.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 #   LShiftU64.asm
  15 #
  16 # Abstract:
  17 #
  18 #   64-bit left shift function for IA-32
  19 #
  20 #------------------------------------------------------------------------------
  21
  22     .686:
  23     #.MODEL flat,C
  24     .code:
  25
  26 .global _InternalMathLShiftU64
  27 _InternalMathLShiftU64:
  28     movb    12(%esp), %cl
  29     xorl    %eax, %eax
  30     movl    4(%esp), %edx
  31     testb   $32, %cl
  32     cmovz   %edx, %eax
  33     cmovz   0x8(%esp), %edx
  34     shld    %cl,%eax,%edx
  35     shl     %cl, %eax
  36     ret