audk/OldMdePkg/Library/BaseLib/Ia32/MultU64x32.c

31 lines
944 B
C

/** @file
Calculate the product of a 64-bit integer and a 32-bit integer
Copyright (c) 2006 - 2007, Intel Corporation<BR>
All rights reserved. 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.
**/
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
}
}