MdePkg/Library/BaseLib/Ia32/MultU64x32.nasm

   1 ;------------------------------------------------------------------------------
   2 ;
   3 ; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>
   4 ; SPDX-License-Identifier: BSD-2-Clause-Patent
   5 ;
   6 ; Module Name:
   7 ;
   8 ;   MultU64x32.nasm
   9 ;
  10 ; Abstract:
  11 ;
  12 ;   Calculate the product of a 64-bit integer and a 32-bit integer
  13 ;
  14 ;------------------------------------------------------------------------------
  15
  16     SECTION .text
  17
  18 ;------------------------------------------------------------------------------
  19 ; UINT64
  20 ; EFIAPI
  21 ; InternalMathMultU64x32 (
  22 ;   IN      UINT64                    Multiplicand,
  23 ;   IN      UINT32                    Multiplier
  24 ;   );
  25 ;------------------------------------------------------------------------------
  26 global ASM_PFX(InternalMathMultU64x32)
  27 ASM_PFX(InternalMathMultU64x32):
  28     mov     ecx, [esp + 12]
  29     mov     eax, ecx
  30     imul    ecx, [esp + 8]              ; overflow not detectable
  31     mul     dword [esp + 4]
  32     add     edx, ecx
  33     ret
  34