MdePkg/Library/BaseLib/Ia32/MultU64x32.S

   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 #   MultU64x32.S
  15 #
  16 # Abstract:
  17 #
  18 #   Calculate the product of a 64-bit integer and a 32-bit integer
  19 #
  20 #------------------------------------------------------------------------------
  21
  22
  23     .code:
  24
  25 ASM_GLOBAL ASM_PFX(InternalMathMultU64x32)
  26
  27 #------------------------------------------------------------------------------
  28 # UINT64
  29 # EFIAPI
  30 # InternalMathMultU64x32 (
  31 #   IN      UINT64                    Multiplicand,
  32 #   IN      UINT32                    Multiplier
  33 #   );
  34 #------------------------------------------------------------------------------
  35 ASM_PFX(InternalMathMultU64x32):
  36     movl    12(%esp), %ecx
  37     movl    %ecx, %eax
  38     imull   8(%esp), %ecx               # overflow not detectable
  39     mull    0x4(%esp)
  40     addl    %ecx, %edx
  41     ret