lib/libc/arch/mips/gen/fpsetround.c

   1 /*      $NetBSD: fpsetround.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: fpsetround.c,v 1.4 2005/06/12 05:21:26 lukem Exp $");
  11 #endif /* LIBC_SCCS and not lint */
  12
  13 #include "namespace.h"
  14
  15 #include <ieeefp.h>
  16
  17 #ifdef __weak_alias
  18 __weak_alias(fpsetround,_fpsetround)
  19 #endif
  20
  21 fp_rnd
  22 fpsetround(rnd_dir)
  23         fp_rnd rnd_dir;
  24 {
  25         fp_rnd old;
  26         fp_rnd new;
  27
  28         __asm("cfc1 %0,$31" : "=r" (old));
  29
  30         new = old;
  31         new &= ~0x03;
  32         new |= (rnd_dir & 0x03);
  33
  34         __asm("ctc1 %0,$31" : : "r" (new));
  35
  36         return old & 0x03;
  37 }