lib/float/cmf4.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         COMPARE SINGLES (CMF 4)
  10 */
  11
  12 #include        "FP_types.h"
  13 #include        "get_put.h"
  14
  15 int
  16 cmf4(f1,f2)
  17 SINGLE  f1,f2;
  18 {
  19                 /*
  20                  * return ((f1 < f2) ? 1 : (f1 - f2))
  21                  */
  22 #define SIGN(x) (((x) < 0) ? -1 : 1)
  23         int     sign1,sign2;
  24         long    l1,l2;
  25
  26         l1 = get4((char *) &f1);
  27         l2 = get4((char *) &f2);
  28
  29         if (l1 == l2) return 0;
  30
  31         sign1 = SIGN(l1);
  32         sign2 = SIGN(l2);
  33         if (sign1 != sign2) {
  34                 if ((l1 & 0x7fffffff) == 0 &&
  35                     (l2 & 0x7fffffff) == 0) return 0;
  36                 return ((sign1 > 0) ? -1 : 1);
  37         }
  38
  39         return (sign1 * ((l1 < l2) ? 1 : -1));
  40 }