/*      $NetBSD: fpsetround.c,v 1.8 2024/04/02 20:42:12 rillig Exp $    */

/*
 * Written by J.T. Conklin, Apr 10, 1995
 * Public domain.
 */

#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: fpsetround.c,v 1.8 2024/04/02 20:42:12 rillig Exp $");
#endif /* LIBC_SCCS and not lint */

#include "namespace.h"

#include <ieeefp.h>

#ifdef __weak_alias
__weak_alias(fpsetround,_fpsetround)
#endif

fp_rnd
fpsetround(fp_rnd rnd_dir)
{
        fp_rnd old;
        fp_rnd new;

        __asm("st %%fsr,%0" : "=m" (*&old));

        new = old;
        new &= ~(0x03U << 30);
        new |= ((rnd_dir & 0x03U) << 30);

        __asm("ld %0,%%fsr" : : "m" (*&new));

        return ((unsigned int)old >> 30) & 0x03;
}