11.8Srillig/*	$NetBSD: fpsetround.c,v 1.8 2024/04/02 20:42:12 rillig Exp $	*/
21.2Sperry
31.1Sjtc/*
41.1Sjtc * Written by J.T. Conklin, Apr 10, 1995
51.1Sjtc * Public domain.
61.1Sjtc */
71.1Sjtc
81.3Sthorpej#include <sys/cdefs.h>
91.4Slukem#if defined(LIBC_SCCS) && !defined(lint)
101.8Srillig__RCSID("$NetBSD: fpsetround.c,v 1.8 2024/04/02 20:42:12 rillig Exp $");
111.4Slukem#endif /* LIBC_SCCS and not lint */
121.3Sthorpej
131.3Sthorpej#include "namespace.h"
141.3Sthorpej
151.1Sjtc#include <ieeefp.h>
161.3Sthorpej
171.3Sthorpej#ifdef __weak_alias
181.3Sthorpej__weak_alias(fpsetround,_fpsetround)
191.3Sthorpej#endif
201.1Sjtc
211.1Sjtcfp_rnd
221.6Schristosfpsetround(fp_rnd rnd_dir)
231.1Sjtc{
241.1Sjtc	fp_rnd old;
251.1Sjtc	fp_rnd new;
261.1Sjtc
271.5Sperry	__asm("st %%fsr,%0" : "=m" (*&old));
281.1Sjtc
291.1Sjtc	new = old;
301.8Srillig	new &= ~(0x03U << 30);
311.8Srillig	new |= ((rnd_dir & 0x03U) << 30);
321.1Sjtc
331.5Sperry	__asm("ld %0,%%fsr" : : "m" (*&new));
341.1Sjtc
351.6Schristos	return ((unsigned int)old >> 30) & 0x03;
361.1Sjtc}
37