rom/mathffp/spabs.c

   1 /*
   2     Copyright © 1995-2004, The AROS Development Team. All rights reserved.
   3     $Id$
   4 */
   5
   6 #include "mathffp_intern.h"
   7
   8 /*
   9     FUNCTION
  10         Calculate the absolute value of a given floating point number
  11
  12     RESULT
  13         absolute value of fnum1
  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     INTERNALS
  29        Set the sign-bit to zero
  30
  31     HISTORY
  32 */
  33
  34 AROS_LH1(float, SPAbs,
  35     AROS_LHA(float, fnum1, D0),
  36     struct LibHeader *, MathBase, 9, Mathffp
  37 )
  38 {
  39     AROS_LIBFUNC_INIT
  40
  41     if (0 == fnum1)
  42     {
  43         /* value is 0 -> set the Zero Flag */
  44         SetSR( Zero_Bit, Zero_Bit | Overflow_Bit | Negative_Bit);
  45     }
  46     else
  47     {
  48         fnum1 &= (FFPMantisse_Mask | FFPExponent_Mask);
  49         /* set the sign-bit to zero */
  50         SetSR(0, Zero_Bit | Overflow_Bit | Negative_Bit );
  51     }
  52     return fnum1;
  53
  54     AROS_LIBFUNC_EXIT
  55 }