workbench/libs/mathieeesingbas/ieeespceil.c

   1 /*
   2     Copyright © 1995-2004, The AROS Development Team. All rights reserved.
   3     $Id$
   4 */
   5
   6 #include "mathieeesingbas_intern.h"
   7
   8 /*****************************************************************************
   9
  10     NAME */
  11
  12         AROS_LH1(float, IEEESPCeil,
  13
  14 /*  SYNOPSIS */
  15         AROS_LHA(float, y, D0),
  16
  17 /*  LOCATION */
  18         struct LibHeader *, MathIeeeSingBasBase, 16, Mathieeesingbas)
  19
  20 /*  FUNCTION
  21         Calculate the least integer ieeesp-number
  22         greater than or equal to y
  23
  24     INPUTS
  25
  26     RESULT
  27         Flags:
  28           zero     : result is zero
  29           negative : result is negative
  30           overflow : 0
  31
  32     BUGS
  33
  34     SEE ALSO
  35         IEEESPFloor()
  36
  37     INTERNALS
  38         ALGORITHM:
  39         Ceil(y) = - Floor(-y)
  40
  41 *****************************************************************************/
  42 {
  43     AROS_LIBFUNC_INIT
  44
  45     if (y == 0x7f880000) return y;
  46
  47     /* Ceil(y) = -Floor(-y); */
  48     y = IEEESPFloor(y ^ IEEESPSign_Mask);
  49     if (y == 0) return 0;
  50     else        return (y ^ IEEESPSign_Mask);
  51
  52     AROS_LIBFUNC_EXIT
  53 }