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[mirror_edk2.git] / MdePkg / Library / BaseLib / Ia32 / MultU64x64.c

/** @file\r
  Calculate the product of a 64-bit integer and another 64-bit integer\r
\r
  Copyright (c) 2006 - 2007, Intel Corporation<BR>\r
  All rights reserved. This program and the accompanying materials\r
  are licensed and made available under the terms and conditions of the BSD License\r
  which accompanies this distribution.  The full text of the license may be found at\r
  http://opensource.org/licenses/bsd-license.php\r
\r
  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
\r
**/\r
\r
\r
\r
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/**\r
  Multiples a 64-bit unsigned integer by a 64-bit unsigned integer\r
  and generates a 64-bit unsigned result.\r
\r
  This function multiples the 64-bit unsigned value Multiplicand by the 64-bit\r
  unsigned value Multiplier and generates a 64-bit unsigned result. This 64-\r
  bit unsigned result is returned.\r
\r
  @param  Multiplicand  A 64-bit unsigned value.\r
  @param  Multiplier    A 64-bit unsigned value.\r
\r
  @return Multiplicand * Multiplier\r
\r
**/\r
UINT64\r
EFIAPI\r
InternalMathMultU64x64 (\r
  IN      UINT64                    Multiplicand,\r
  IN      UINT64                    Multiplier\r
  )\r
{\r
  _asm {\r
    mov     ebx, dword ptr [Multiplicand + 0]\r
    mov     edx, dword ptr [Multiplier + 0]\r
    mov     ecx, ebx\r
    mov     eax, edx\r
    imul    ebx, dword ptr [Multiplier + 4]\r
    imul    edx, dword ptr [Multiplicand + 4]\r
    add     ebx, edx\r
    mul     ecx\r
    add     edx, ebx\r
  }\r
}\r
\r