audk/EdkCompatibilityPkg/Foundation/Library/EfiCommonLib/Ia32/Power10U64.c

/*++

Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials                          
are licensed and made available under the terms and conditions of the BSD License         
which accompanies this distribution.  The full text of the license may be found at        
http://opensource.org/licenses/bsd-license.php                                            
                                                                                          
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,                     
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.             

Module Name:

  Power10U64.c

Abstract:

  Calculates Operand * 10 ^ Power

--*/

#include "Tiano.h"

UINT64
MultU64x32 (
  IN UINT64   Multiplicand,
  IN UINTN    Multiplier
  );

UINT64
Power10U64 (
  IN UINT64   Operand,
  IN UINTN    Power
  )
/*++

Routine Description:

  Raise 10 to the power of Power, and multiply the result with Operand

Arguments:

  Operand  - multiplicand
  Power    - power

Returns:

  Operand * 10 ^ Power

--*/
{
  __asm {
  mov    eax, dword ptr Operand[0]
  mov    edx, dword ptr Operand[4]
  mov    ecx, Power
  jcxz   _Power10U64_Done
  
_Power10U64_Wend:
  push   ecx
  push   10
  push   dword ptr Operand[4]
  push   dword ptr Operand[0]
  call   MultU64x32
  add    esp, 0Ch
  pop    ecx
  mov    dword ptr Operand[0], eax
  mov    dword ptr Operand[4], edx
  loop   _Power10U64_Wend

_Power10U64_Done:
  }
}