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;------------------------------------------------------------------------------
;
; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>
; SPDX-License-Identifier: BSD-2-Clause-Patent
;
; Module Name:
;
; MultU64x64.nasm
;
; Abstract:
;
; Calculate the product of a 64-bit integer and another 64-bit integer
;
;------------------------------------------------------------------------------
SECTION .text
;------------------------------------------------------------------------------
; UINT64
; EFIAPI
; InternalMathMultU64x64 (
; IN UINT64 Multiplicand,
; IN UINT64 Multiplier
; );
;------------------------------------------------------------------------------
global ASM_PFX(InternalMathMultU64x64)
ASM_PFX(InternalMathMultU64x64):
push ebx
mov ebx, [esp + 8] ; ebx <- M1[0..31]
mov edx, [esp + 16] ; edx <- M2[0..31]
mov ecx, ebx
mov eax, edx
imul ebx, [esp + 20] ; ebx <- M1[0..31] * M2[32..63]
imul edx, [esp + 12] ; edx <- M1[32..63] * M2[0..31]
add ebx, edx ; carries are abandoned
mul ecx ; edx:eax <- M1[0..31] * M2[0..31]
add edx, ebx ; carries are abandoned
pop ebx
ret
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