1169695Skan/* $NetBSD: fpsetround.c,v 1.1 2006/07/01 16:37:20 ross Exp $ */ 2169695Skan 3169695Skan/* 4169695Skan * Copyright (c) 1999 The NetBSD Foundation, Inc. 5169695Skan * All rights reserved. 6169695Skan * 7169695Skan * This code is derived from software contributed to The NetBSD Foundation 8169695Skan * by Dan Winship. 9169695Skan * 10169695Skan * Redistribution and use in source and binary forms, with or without 11169695Skan * modification, are permitted provided that the following conditions 12169695Skan * are met: 13169695Skan * 1. Redistributions of source code must retain the above copyright 14169695Skan * notice, this list of conditions and the following disclaimer. 15169695Skan * 2. Redistributions in binary form must reproduce the above copyright 16169695Skan * notice, this list of conditions and the following disclaimer in the 17169695Skan * documentation and/or other materials provided with the distribution. 18169695Skan * 19169695Skan * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20169695Skan * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21169695Skan * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22169695Skan * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23169695Skan * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24169695Skan * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25169695Skan * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26169695Skan * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27169695Skan * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28169695Skan * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29169695Skan * POSSIBILITY OF SUCH DAMAGE. 30169695Skan */ 31169695Skan 32169695Skan#include <sys/cdefs.h> 33169695Skan#if defined(LIBC_SCCS) && !defined(lint) 34169695Skan__RCSID("$NetBSD: fpsetround.c,v 1.1 2006/07/01 16:37:20 ross Exp $"); 35169695Skan#endif /* LIBC_SCCS and not lint */ 36169695Skan 37169695Skan#include "namespace.h" 38169695Skan 39169695Skan#include <sys/types.h> 40169695Skan#include <ieeefp.h> 41169695Skan#include <powerpc/fpu.h> 42169695Skan 43169695Skan#ifdef __weak_alias 44169695Skan__weak_alias(fpsetround,_fpsetround) 45169695Skan#endif 46169695Skan 47169695Skan#define ROUNDBITS FPSCR_RN 48169695Skan 49169695Skanfp_rnd 50169695Skanfpsetround(fp_rnd rnd_dir) 51169695Skan{ 52169695Skan uint64_t fpscr; 53169695Skan fp_rnd old; 54169695Skan 55169695Skan __asm volatile("mffs %0" : "=f"(fpscr)); 56169695Skan old = (uint32_t)fpscr & ROUNDBITS; 57169695Skan fpscr &= ~ROUNDBITS; 58169695Skan fpscr |= rnd_dir & ROUNDBITS; 59169695Skan __asm volatile("mtfsf 0xff,%0" :: "f"(fpscr)); 60169695Skan return (old); 61169695Skan} 62169695Skan