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

   1 /*      $NetBSD: fpsetround.c,v 1.5 2009/01/25 16:44:41 skrll Exp $     */
   2
   3 /*      $OpenBSD: fpsetround.c,v 1.3 2002/10/21 18:41:05 mickey Exp $   */
   4
   5 /*
   6  * Written by Miodrag Vallat.  Public domain
   7  */
   8
   9 #include <sys/cdefs.h>
  10 #if defined(LIBC_SCCS) && !defined(lint)
  11 __RCSID("$NetBSD: fpsetround.c,v 1.5 2009/01/25 16:44:41 skrll Exp $");
  12 #endif /* LIBC_SCCS and not lint */
  13
  14 #include <sys/types.h>
  15 #include <ieeefp.h>
  16
  17 fp_rnd
  18 fpsetround(fp_rnd rnd_dir)
  19 {
  20         uint64_t fpsr;
  21         fp_rnd old;
  22
  23         __asm volatile("fstd %%fr0,0(%1)" : "=m" (fpsr) : "r" (&fpsr) : "memory");
  24         old = (fpsr >> 41) & 0x03;
  25         fpsr = (fpsr & 0xfffff9ff00000000LL) |
  26             ((uint64_t)(rnd_dir & 0x03) << 41);
  27         __asm volatile("fldd 0(%0),%%fr0" : : "r" (&fpsr) : "memory");
  28         return (old);
  29 }