1#------------------------------------------------------------------------------
2#
3# Copyright (c) 2006 - 2008, 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.S
15#
16# Abstract:
17#
18#   Calculate the product of a 64-bit integer and another 64-bit integer
19#
20#------------------------------------------------------------------------------
21
22ASM_GLOBAL ASM_PFX(InternalMathMultU64x64)
23
24#------------------------------------------------------------------------------
25# UINT64
26# EFIAPI
27# InternalMathMultU64x64 (
28#   IN      UINT64                    Multiplicand,
29#   IN      UINT64                    Multiplier
30#   );
31#------------------------------------------------------------------------------
32ASM_PFX(InternalMathMultU64x64):
33    push    %ebx
34    movl    8(%esp), %ebx             # ebx <- M1[0..31]
35    movl    16(%esp), %edx            # edx <- M2[0..31]
36    movl    %ebx, %ecx
37    movl    %edx, %eax
38    imull   20(%esp), %ebx            # ebx <- M1[0..31] * M2[32..63]
39    imull   12(%esp), %edx            # edx <- M1[32..63] * M2[0..31]
40    addl    %edx, %ebx                # carries are abandoned
41    mull    %ecx                      # edx:eax <- M1[0..31] * M2[0..31]
42    addl    %ebx, %edx                # carries are abandoned
43    pop     %ebx
44    ret
45