;/*++ ; ;Copyright (c) 2006, Intel Corporation. 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. ; ;Module Name: ; ; MultU64x32.c ; ;Abstract: ; ; 64-bit Multiplication function for IA-32 ; ;--*/ ;--------------------------------------------------------------------------- .686 .model flat,C .code ;--------------------------------------------------------------------------- ;UINT64 ;MultU64x32 ( ; IN UINT64 Multiplicand, ; IN UINTN Multiplier ; ) ;/*++ ; ;Routine Description: ; ; This routine allows a 64 bit value to be multiplied with a 32 bit ; value returns 64bit result. ; No checking if the result is greater than 64bits ; ;Arguments: ; ; Multiplicand - multiplicand ; Multiplier - multiplier ; ;Returns: ; ; Multiplicand * Multiplier ; ;--*/ MultU64x32 PROC mov eax, [esp + 4]; dword ptr Multiplicand[0] mul dword ptr [esp + 0Ch] ; Multiplier push eax push edx mov eax, [esp + 10h]; dword ptr Multiplicand[4] mul dword ptr [esp + 14h]; Multiplier ; ; The value in edx stored by second multiplication overflows ; the output and should be discarded. So here we overwrite it ; with the edx value of first multiplication. ; pop edx add edx, eax pop eax ret MultU64x32 ENDP END