MdePkg/Library/BaseLib/Ia32/LShiftU64.S

   1 //
   2 // Include common header file for this module.
   3 //
   4 #include "CommonHeader.h"
   5
   6 #------------------------------------------------------------------------------
   7 #
   8 # Copyright (c) 2006, Intel Corporation
   9 # All rights reserved. This program and the accompanying materials
  10 # are licensed and made available under the terms and conditions of the BSD License
  11 # which accompanies this distribution.  The full text of the license may be found at
  12 # http://opensource.org/licenses/bsd-license.php
  13 #
  14 # THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  15 # WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  16 #
  17 # Module Name:
  18 #
  19 #   LShiftU64.asm
  20 #
  21 # Abstract:
  22 #
  23 #   64-bit left shift function for IA-32
  24 #
  25 #------------------------------------------------------------------------------
  26
  27 .globl ASM_PFX(InternalMathLShiftU64)
  28
  29 #------------------------------------------------------------------------------
  30 # UINT64
  31 # EFIAPI
  32 # InternalMathLShiftU64 (
  33 #   IN      UINT64                    Operand,
  34 #   IN      UINTN                     Count
  35 #   );
  36 #------------------------------------------------------------------------------
  37 ASM_PFX(InternalMathLShiftU64):
  38     movb    12(%esp), %cl
  39     xorl    %eax, %eax
  40     movl    4(%esp), %edx
  41     testb   $32, %cl
  42     cmovz   %edx, %eax
  43     cmovz   0x8(%esp), %edx
  44     shld    %cl, %eax, %edx
  45     shl     %cl, %eax
  46     ret