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flt_rounds.c revision 1.2 
      1 /*	$NetBSD: flt_rounds.c,v 1.2 2003/11/01 14:26:29 nakayama Exp $	*/
      2 
      3 /*
      4  * Written by J.T. Conklin, Apr 10, 1995
      5  * Public domain.
      6  */
      7 
      8 #include <sys/types.h>
      9 #include <machine/float.h>
     10 
     11 static const int map[] = {
     12 	1,	/* round to nearest */
     13 	0,	/* round to zero */
     14 	2,	/* round to positive infinity */
     15 	3	/* round to negative infinity */
     16 };
     17 
     18 int
     19 __flt_rounds()
     20 {
     21 	int x;
     22 
     23 	__asm__("st %%fsr,%0" : "=m" (*&x));
     24 	return map[(x >> 30) & 0x03];
     25 }
     26