MdePkg/Library/BaseLib/Ia32/DivS64x64Remainder.c

   1 /** @file
   2   Integer division worker functions for Ia32.
   3
   4   Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>
   5   SPDX-License-Identifier: BSD-2-Clause-Patent
   6
   7 **/
   8
   9 #include "BaseLibInternals.h"
  10
  11 /**
  12   Worker function that Divides a 64-bit signed integer by a 64-bit signed integer and
  13   generates a  64-bit signed result and a optional 64-bit signed remainder.
  14
  15   This function divides the 64-bit signed value Dividend by the 64-bit
  16   signed value Divisor and generates a 64-bit signed quotient. If Remainder
  17   is not NULL, then the 64-bit signed remainder is returned in Remainder.
  18   This function returns the 64-bit signed quotient.
  19
  20   @param  Dividend  A 64-bit signed value.
  21   @param  Divisor   A 64-bit signed value.
  22   @param  Remainder A pointer to a 64-bit signed value. This parameter is
  23                     optional and may be NULL.
  24
  25   @return Dividend / Divisor
  26
  27 **/
  28 INT64
  29 EFIAPI
  30 InternalMathDivRemS64x64 (
  31   IN      INT64                     Dividend,
  32   IN      INT64                     Divisor,
  33   OUT     INT64                     *Remainder  OPTIONAL
  34   )
  35 {
  36   INT64                             Quot;
  37
  38   Quot = InternalMathDivRemU64x64 (
  39            (UINT64) (Dividend >= 0 ? Dividend : -Dividend),
  40            (UINT64) (Divisor >= 0 ? Divisor : -Divisor),
  41            (UINT64 *) Remainder
  42            );
  43   if (Remainder != NULL && Dividend < 0) {
  44     *Remainder = -*Remainder;
  45   }
  46   return (Dividend ^ Divisor) >= 0 ? Quot : -Quot;
  47 }