fpsetround.c revision 1.4 
11.4Slukem/*	$NetBSD: fpsetround.c,v 1.4 2005/06/12 05:21:26 lukem 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)
101.4Slukem__RCSID("$NetBSD: fpsetround.c,v 1.4 2005/06/12 05:21:26 lukem 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
221.1Sjtcfpsetround(rnd_dir)
231.1Sjtc	fp_rnd rnd_dir;
241.1Sjtc{
251.1Sjtc	fp_rnd old;
261.1Sjtc	fp_rnd new;
271.1Sjtc
281.1Sjtc	__asm__("st %%fsr,%0" : "=m" (*&old));
291.1Sjtc
301.1Sjtc	new = old;
311.1Sjtc	new &= ~(0x03 << 30);
321.1Sjtc	new |= ((rnd_dir & 0x03) << 30);
331.1Sjtc
341.1Sjtc	__asm__("ld %0,%%fsr" : : "m" (*&new));
351.1Sjtc
361.1Sjtc	return (old >> 30) & 0x03;
371.1Sjtc}
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