lib/libc/arch/sparc/gen/flt_rounds.c

   1 /*      $NetBSD: flt_rounds.c,v 1.7 2012/03/21 00:38:34 christos Exp $  */
   2
   3 /*
   4  * Written by J.T. Conklin, Apr 10, 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 1.7 2012/03/21 00:38:34 christos Exp $");
  11 #endif /* LIBC_SCCS and not lint */
  12
  13 #include <sys/types.h>
  14 #include <machine/float.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         unsigned int x;
  27
  28         __asm("st %%fsr,%0" : "=m" (*&x));
  29         return map[(x >> 30) & 0x03];
  30 }