rom/mathieeesingbas/ieeespabs.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     FUNCTION
  10         Calculate the absolute value of a given floating point number
  11
  12     RESULT
  13         absolute value of y
  14
  15         Flags:
  16           zero     : result is zero
  17           negative : result is negative
  18           overflow : 0
  19
  20     NOTES
  21
  22     EXAMPLE
  23
  24     BUGS
  25
  26     SEE ALSO
  27
  28
  29     INTERNALS
  30       ALGORITHM:
  31         set the sign-bit to zero
  32
  33     HISTORY
  34 */
  35
  36 AROS_LH1(float, IEEESPAbs,
  37     AROS_LHA(float, y, D0),
  38     struct LibHeader *, MathIeeeSingBasBase, 9, Mathieeesingbas
  39 )
  40 {
  41     AROS_LIBFUNC_INIT
  42
  43     if (0 == y)
  44     {
  45         /* value is 0 -> set the Zero Flag */
  46         SetSR( Zero_Bit, Zero_Bit | Overflow_Bit | Negative_Bit);
  47     }
  48     else
  49     {
  50         /* set the sign-bit to zero */
  51         y &= (IEEESPMantisse_Mask | IEEESPExponent_Mask);
  52         SetSR(0, Zero_Bit | Overflow_Bit | Negative_Bit );
  53     }
  54
  55     return y;
  56
  57     AROS_LIBFUNC_EXIT
  58 }