workbench/libs/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
  10     NAME */
  11
  12         AROS_LH1(float, SPAbs,
  13
  14 /*  SYNOPSIS */
  15         AROS_LHA(float, fnum1, D0),
  16
  17 /*  LOCATION */
  18         struct LibHeader *, MathBase, 9, Mathffp)
  19
  20 /*  FUNCTION
  21         Calculate the absolute value of a given floating point number
  22
  23     INPUTS
  24
  25     RESULT
  26         absolute value of fnum1
  27
  28         Flags:
  29           zero     : result is zero
  30           negative : result is negative
  31           overflow : 0
  32     BUGS
  33
  34     INTERNALS
  35         Set the sign-bit to zero
  36
  37 *****************************************************************************/
  38 {
  39     AROS_LIBFUNC_INIT
  40     D(kprintf("SPAbs(%08x)\n", fnum1));
  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 }