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flt_rounds.c revision 1.6.6.1 
      1 /*	$NetBSD: flt_rounds.c,v 1.6.6.1 2012/10/30 18:58:40 yamt 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 1.6.6.1 2012/10/30 18:58:40 yamt Exp $");
     11 #endif /* LIBC_SCCS and not lint */
     12 
     13 #include <machine/float.h>
     14 #include <ieeefp.h>
     15 
     16 static const int map[] = {
     17 	1,	/* round to nearest */
     18 	0,	/* round to zero */
     19 	2,	/* round to positive infinity */
     20 	3	/* round to negative infinity */
     21 };
     22 
     23 int
     24 __flt_rounds(void)
     25 {
     26 #ifdef SOFTFLOAT_FOR_GCC
     27 	return map[fpgetround()];
     28 #else
     29 	int x;
     30 
     31 	__asm("cfc1\t%0,$31" : "=r" (x));
     32 	return map[x & 0x03];
     33 #endif
     34 }
     35