lib/float/ngf8.c

   1 /*
   2   (c) copyright 1988 by the Vrije Universiteit, Amsterdam, The Netherlands.
   3   See the copyright notice in the ACK home directory, in the file "Copyright".
   4 */
   5
   6 /* $Header$ */
   7
   8 /*
   9                 NEGATE A FLOATING POINT (NGF 8)
  10 */
  11 /********************************************************/
  12
  13 #include "FP_types.h"
  14 #include "get_put.h"
  15
  16 #define OFF ((FL_MSL_AT_LOW_ADDRESS ? 0 : 4) + (FL_MSW_AT_LOW_ADDRESS ? 0 : 2) + (FL_MSB_AT_LOW_ADDRESS ? 0 : 1))
  17
  18 void
  19 ngf8(f)
  20 DOUBLE  f;
  21 {
  22         unsigned char   *p;
  23
  24         if (f.d[0] != 0 || f.d[1] != 0) {
  25                 p = (unsigned char *) &f + OFF;
  26                 *p ^= 0x80;
  27         }
  28 }