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flt_rounds.c revision 1.4 
      1 /*	$NetBSD: flt_rounds.c,v 1.4 2005/06/12 05:21:26 lukem Exp $	*/
      2 
      3 /*
      4  * Written by J.T. Conklin, Apr 11, 1995
      5  * Public domain.
      6  */
      7 
      8 #include <sys/cdefs.h>
      9 #if defined(LIBC_SCCS) && !defined(lint)
     10 __RCSID("$NetBSD: flt_rounds.c,v 1.4 2005/06/12 05:21:26 lukem Exp $");
     11 #endif /* LIBC_SCCS and not lint */
     12 
     13 #include <machine/float.h>
     14 
     15 static const int map[] = {
     16 	1,	/* round to nearest */
     17 	0,	/* round to zero */
     18 	2,	/* round to positive infinity */
     19 	3	/* round to negative infinity */
     20 };
     21 
     22 int
     23 __flt_rounds()
     24 {
     25 	int x;
     26 
     27 	__asm__("cfc1 %0,$31" : "=r" (x));
     28 	return map[x & 0x03];
     29 }
     30