1/*	$NetBSD: fpsetround.c,v 1.8 2024/04/02 20:42:12 rillig 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: fpsetround.c,v 1.8 2024/04/02 20:42:12 rillig 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
21fp_rnd
22fpsetround(fp_rnd rnd_dir)
23{
24	fp_rnd old;
25	fp_rnd new;
26
27	__asm("st %%fsr,%0" : "=m" (*&old));
28
29	new = old;
30	new &= ~(0x03U << 30);
31	new |= ((rnd_dir & 0x03U) << 30);
32
33	__asm("ld %0,%%fsr" : : "m" (*&new));
34
35	return ((unsigned int)old >> 30) & 0x03;
36}
37