MdePkg/Library/BaseLib/Ia32/DivS64x64Remainder.c

   1 /** @file
   2   Integer division worker functions for Ia32.
   3
   4   Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
   5   This program and the accompanying materials
   6   are licensed and made available under the terms and conditions of the BSD License
   7   which accompanies this distribution.  The full text of the license may be found at
   8   http://opensource.org/licenses/bsd-license.php
   9
  10   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12
  13 **/
  14
  15 #include "BaseLibInternals.h"
  16
  17 /**
  18   Worker function that Divides a 64-bit signed integer by a 64-bit signed integer and
  19   generates a  64-bit signed result and a optional 64-bit signed remainder.
  20
  21   This function divides the 64-bit signed value Dividend by the 64-bit
  22   signed value Divisor and generates a 64-bit signed quotient. If Remainder
  23   is not NULL, then the 64-bit signed remainder is returned in Remainder.
  24   This function returns the 64-bit signed quotient.
  25
  26   @param  Dividend  A 64-bit signed value.
  27   @param  Divisor   A 64-bit signed value.
  28   @param  Remainder A pointer to a 64-bit signed value. This parameter is
  29                     optional and may be NULL.
  30
  31   @return Dividend / Divisor
  32
  33 **/
  34 INT64
  35 EFIAPI
  36 InternalMathDivRemS64x64 (
  37   IN      INT64                     Dividend,
  38   IN      INT64                     Divisor,
  39   OUT     INT64                     *Remainder  OPTIONAL
  40   )
  41 {
  42   INT64                             Quot;
  43
  44   Quot = InternalMathDivRemU64x64 (
  45            Dividend >= 0 ? Dividend : -Dividend,
  46            Divisor >= 0 ? Divisor : -Divisor,
  47            (UINT64 *) Remainder
  48            );
  49   if (Remainder != NULL && Dividend < 0) {
  50     *Remainder = -*Remainder;
  51   }
  52   return (Dividend ^ Divisor) >= 0 ? Quot : -Quot;
  53 }