1;------------------------------------------------------------------------------
2;
3; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>
4; This program and the accompanying materials
5; are licensed and made available under the terms and conditions of the BSD License
6; which accompanies this distribution.  The full text of the license may be found at
7; http://opensource.org/licenses/bsd-license.php.
8;
9; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
10; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
11;
12; Module Name:
13;
14;   MultU64x64.nasm
15;
16; Abstract:
17;
18;   Calculate the product of a 64-bit integer and another 64-bit integer
19;
20;------------------------------------------------------------------------------
21
22    SECTION .text
23
24;------------------------------------------------------------------------------
25; UINT64
26; EFIAPI
27; InternalMathMultU64x64 (
28;   IN      UINT64                    Multiplicand,
29;   IN      UINT64                    Multiplier
30;   );
31;------------------------------------------------------------------------------
32global ASM_PFX(InternalMathMultU64x64)
33ASM_PFX(InternalMathMultU64x64):
34    push    ebx
35    mov     ebx, [esp + 8]              ; ebx <- M1[0..31]
36    mov     edx, [esp + 16]             ; edx <- M2[0..31]
37    mov     ecx, ebx
38    mov     eax, edx
39    imul    ebx, [esp + 20]             ; ebx <- M1[0..31] * M2[32..63]
40    imul    edx, [esp + 12]             ; edx <- M1[32..63] * M2[0..31]
41    add     ebx, edx                    ; carries are abandoned
42    mul     ecx                         ; edx:eax <- M1[0..31] * M2[0..31]
43    add     edx, ebx                    ; carries are abandoned
44    pop     ebx
45    ret
46
47