EdkCompatibilityPkg/Foundation/Library/EdkIIGlueLib/Library/BaseLib/Ia32/LShiftU64.asm

   1 ; Copyright (c) 2004, Intel Corporation
   2 ; All rights reserved. This program and the accompanying materials
   3 ; are licensed and made available under the terms and conditions of the BSD License
   4 ; which accompanies this distribution.  The full text of the license may be found at
   5 ; http://opensource.org/licenses/bsd-license.php
   6 ;
   7 ; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
   8 ; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
   9 ;
  10 ; Module Name:
  11 ;
  12 ;   LShiftU64.asm
  13 ;
  14 ; Abstract:
  15 ;
  16 ;   64-bit left shift function for IA-32
  17 ;
  18 ;------------------------------------------------------------------------------
  19
  20     .686
  21     .model  flat,C
  22     .code
  23
  24 ;------------------------------------------------------------------------------
  25 ; UINT64
  26 ; EFIAPI
  27 ; InternalMathLShiftU64 (
  28 ;   IN      UINT64                    Operand,
  29 ;   IN      UINTN                     Count
  30 ;   );
  31 ;------------------------------------------------------------------------------
  32 InternalMathLShiftU64   PROC
  33     mov     cl, [esp + 12]
  34     xor     eax, eax
  35     mov     edx, [esp + 4]
  36     test    cl, 32                      ; Count >= 32?
  37     cmovz   eax, edx
  38     cmovz   edx, [esp + 8]
  39     shld    edx, eax, cl
  40     shl     eax, cl
  41     ret
  42 InternalMathLShiftU64   ENDP
  43
  44     END