MdePkg/Library/BaseLib/Ia32/MultU64x32.c

/** @file
  Calculate the product of a 64-bit integer and a 32-bit integer

  Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
  SPDX-License-Identifier: BSD-2-Clause-Patent

**/

/**
  Multiples a 64-bit unsigned integer by a 32-bit unsigned integer
  and generates a 64-bit unsigned result.

  This function multiples the 64-bit unsigned value Multiplicand by the 32-bit
  unsigned value Multiplier and generates a 64-bit unsigned result. This 64-
  bit unsigned result is returned.

  @param  Multiplicand  A 64-bit unsigned value.
  @param  Multiplier    A 32-bit unsigned value.

  @return Multiplicand * Multiplier

**/
UINT64
EFIAPI
InternalMathMultU64x32 (
  IN      UINT64  Multiplicand,
  IN      UINT32  Multiplier
  )
{
  _asm {
    mov     ecx, Multiplier
    mov     eax, ecx
    imul    ecx, dword ptr [Multiplicand + 4]  // overflow not detectable
    mul     dword ptr [Multiplicand + 0]
    add     edx, ecx
  }
}