workbench/libs/mathieeedoubbas/ieeedpsub.c

   1 /*
   2     Copyright © 1995-2017, The AROS Development Team. All rights reserved.
   3     $Id$
   4 */
   5
   6 #include "mathieeedoubbas_intern.h"
   7
   8 /*****************************************************************************
   9
  10     NAME */
  11
  12         AROS_LHQUAD2(double, IEEEDPSub,
  13
  14 /*  SYNOPSIS */
  15         AROS_LHAQUAD(double, y, D0, D1),
  16         AROS_LHAQUAD(double, z, D2, D3),
  17
  18 /*  LOCATION */
  19         struct MathIeeeDoubBasBase *, MathIeeeDoubBasBase, 12, MathIeeeDoubBas)
  20
  21 /*  FUNCTION
  22         Subtracts two IEEE double precision floating point numbers.
  23
  24     INPUTS
  25         y - minuend.
  26         z - subtrahend.
  27
  28     RESULT
  29         x - difference.
  30
  31     NOTES
  32
  33     EXAMPLE
  34
  35     BUGS
  36
  37     SEE ALSO
  38         IEEEDPNeg()
  39
  40     INTERNALS
  41
  42 *****************************************************************************/
  43 {
  44     AROS_LIBFUNC_INIT
  45
  46     QUAD * Qz = (QUAD *)&z;
  47
  48     XOR64QC(*Qz, IEEEDPSign_Mask_Hi, IEEEDPSign_Mask_Lo );
  49     return IEEEDPAdd(y,z);
  50
  51     AROS_LIBFUNC_EXIT
  52 }