EdkCompatibilityPkg/Foundation/Library/EdkIIGlueLib/Library/BaseLib/Ia32/MultU64x64.asm

   1 ; Copyright (c) 2004, Intel Corporation
   2 ; All rights reserved. This program and the accompanying materials
   3 ; are licensed and made available under the terms and conditions of the BSD License
   4 ; which accompanies this distribution.  The full text of the license may be found at
   5 ; http://opensource.org/licenses/bsd-license.php
   6 ;
   7 ; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
   8 ; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
   9 ;
  10 ; Module Name:
  11 ;
  12 ;   MultU64x64.asm
  13 ;
  14 ; Abstract:
  15 ;
  16 ;   Calculate the product of a 64-bit integer and another 64-bit integer
  17 ;
  18 ;------------------------------------------------------------------------------
  19
  20     .386
  21     .model  flat,C
  22     .code
  23
  24 ;------------------------------------------------------------------------------
  25 ; UINT64
  26 ; EFIAPI
  27 ; InternalMathMultU64x64 (
  28 ;   IN      UINT64                    Multiplicand,
  29 ;   IN      UINT64                    Multiplier
  30 ;   );
  31 ;------------------------------------------------------------------------------
  32 InternalMathMultU64x64  PROC    USES    ebx
  33     mov     ebx, [esp + 8]              ; ebx <- M1[0..31]
  34     mov     edx, [esp + 16]             ; edx <- M2[0..31]
  35     mov     ecx, ebx
  36     mov     eax, edx
  37     imul    ebx, [esp + 20]             ; ebx <- M1[0..31] * M2[32..63]
  38     imul    edx, [esp + 12]             ; edx <- M1[32..63] * M2[0..31]
  39     add     ebx, edx                    ; carries are abandoned
  40     mul     ecx                         ; edx:eax <- M1[0..31] * M2[0..31]
  41     add     edx, ebx                    ; carries are abandoned
  42     ret
  43 InternalMathMultU64x64  ENDP
  44
  45     END