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File: [cvs.NetBSD.org] / src / lib / libc / arch / sparc64 / gen / fpsetround.c (download)

Revision 1.5.2.2, Wed Aug 20 00:02:12 2014 UTC (9 years, 8 months ago) by tls
Branch: tls-maxphys
Changes since 1.5.2.1: +3 -4 lines 

Rebase to HEAD as of a few days ago.

/*	$NetBSD: fpsetround.c,v 1.5.2.2 2014/08/20 00:02:12 tls 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 1.5.2.2 2014/08/20 00:02:12 tls Exp $");
#endif /* LIBC_SCCS and not lint */

#include "namespace.h"

#include <sys/types.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;
#ifdef SOFTFLOATSPARC64_FOR_GCC
	extern fp_rnd _softfloat_float_rounding_mode;
#endif

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

#ifdef SOFTFLOATSPARC64_FOR_GCC
	_softfloat_float_rounding_mode = rnd_dir;
#endif

	new = old;
	new &= ~(0x03 << 30); 
	new |= ((rnd_dir & 0x03) << 30);

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

	return ((uint32_t)old >> 30) & 0x03;
}