MdePkg/Library/BaseLib/Ia32/LShiftU64.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 ;   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 InternalMathLShiftU64   PROC
  27     mov     cl, [esp + 12]
  28     xor     eax, eax
  29     mov     edx, [esp + 4]
  30     test    cl, 32
  31     cmovz   eax, edx
  32     cmovz   edx, [esp + 8]
  33     shld    edx, eax, cl
  34     shl     eax, cl
  35     ret
  36 InternalMathLShiftU64   ENDP
  37
  38     END