MdePkg/Library/BaseLib/Ia32/DivS64x64Remainder.c

   1 /** @file
   2   Integer division worker functions for Ia32.
   3
   4   Copyright (c) 2006, Intel Corporation<BR>
   5   All rights reserved. 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 //
  16 // Include common header file for this module.
  17 //
  18
  19
  20 #include "../BaseLibInternals.h"
  21
  22 /**
  23   Worker function that Divides a 64-bit signed integer by a 64-bit signed integer and
  24   generates a  64-bit signed result and a optional 64-bit signed remainder.
  25
  26   This function divides the 64-bit unsigned value Dividend by the 64-bit
  27   unsigned value Divisor and generates a 64-bit unsigned quotient. If Remainder
  28   is not NULL, then the 64-bit unsigned remainder is returned in Remainder.
  29   This function returns the 64-bit unsigned quotient.
  30
  31   @param  Dividend  A 64-bit signed value.
  32   @param  Divisor   A 64-bit signed value.
  33   @param  Remainder A pointer to a 64-bit signed value. This parameter is
  34                     optional and may be NULL.
  35
  36   @return Dividend / Divisor
  37
  38 **/
  39 INT64
  40 EFIAPI
  41 InternalMathDivRemS64x64 (
  42   IN      INT64                     Dividend,
  43   IN      INT64                     Divisor,
  44   OUT     INT64                     *Remainder  OPTIONAL
  45   )
  46 {
  47   INT64                             Quot;
  48
  49   Quot = InternalMathDivRemU64x64 (
  50            Dividend >= 0 ? Dividend : -Dividend,
  51            Divisor >= 0 ? Divisor : -Divisor,
  52            (UINT64 *) Remainder
  53            );
  54   if (Remainder != NULL && Dividend < 0) {
  55     *Remainder = -*Remainder;
  56   }
  57   return (Dividend ^ Divisor) >= 0 ? Quot : -Quot;
  58 }