MdePkg/Library/BaseLib/Ia32/MultU64x64.c

   1 /** @file
   2   Calculate the product of a 64-bit integer and another 64-bit integer
   3
   4   Copyright (c) 2006 - 2007, Intel Corporation<BR>
   5   All rights reserved. This program and the accompanying materials
   6   are licensed and made available under the terms and conditions of the BSD License
   7   which accompanies this distribution.  The full text of the license may be found at
   8   http://opensource.org/licenses/bsd-license.php
   9
  10   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12
  13 **/
  14
  15 UINT64
  16 EFIAPI
  17 InternalMathMultU64x64 (
  18   IN      UINT64                    Multiplicand,
  19   IN      UINT64                    Multiplier
  20   )
  21 {
  22   _asm {
  23     mov     ebx, dword ptr [Multiplicand + 0]
  24     mov     edx, dword ptr [Multiplier + 0]
  25     mov     ecx, ebx
  26     mov     eax, edx
  27     imul    ebx, dword ptr [Multiplier + 4]
  28     imul    edx, dword ptr [Multiplicand + 4]
  29     add     ebx, edx
  30     mul     ecx
  31     add     edx, ebx
  32   }
  33 }
  34