1207151Smarius/*- 2207151Smarius * Copyright (c) 2010 by Peter Jeremy <peterjeremy@acm.org> 3207151Smarius * All rights reserved. 4207151Smarius * 5207151Smarius * Redistribution and use in source and binary forms, with or without 6207151Smarius * modification, are permitted provided that the following conditions 7207151Smarius * are met: 8207151Smarius * 1. Redistributions of source code must retain the above copyright 9207151Smarius * notice, this list of conditions and the following disclaimer. 10207151Smarius * 2. Redistributions in binary form must reproduce the above copyright 11207151Smarius * notice, this list of conditions and the following disclaimer in the 12207151Smarius * documentation and/or other materials provided with the distribution. 13207151Smarius * 14207151Smarius * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 15207151Smarius * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16207151Smarius * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17207151Smarius * IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 18207151Smarius * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 19207151Smarius * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 20207151Smarius * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 21207151Smarius * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 22207151Smarius * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE 23207151Smarius * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24207151Smarius */ 25207151Smarius 26207151Smarius/* 27207151Smarius=============================================================================== 28207151Smarius 29207151SmariusThis C source file is part of TestFloat, Release 2a, a package of programs 30207151Smariusfor testing the correctness of floating-point arithmetic complying to the 31207151SmariusIEC/IEEE Standard for Floating-Point. 32207151Smarius 33207151SmariusWritten by John R. Hauser. More information is available through the Web 34207151Smariuspage `http://HTTP.CS.Berkeley.EDU/~jhauser/arithmetic/TestFloat.html'. 35207151Smarius 36207151SmariusTHIS SOFTWARE IS DISTRIBUTED AS IS, FOR FREE. Although reasonable effort 37207151Smariushas been made to avoid it, THIS SOFTWARE MAY CONTAIN FAULTS THAT WILL AT 38207151SmariusTIMES RESULT IN INCORRECT BEHAVIOR. USE OF THIS SOFTWARE IS RESTRICTED TO 39207151SmariusPERSONS AND ORGANIZATIONS WHO CAN AND WILL TAKE FULL RESPONSIBILITY FOR ANY 40207151SmariusAND ALL LOSSES, COSTS, OR OTHER PROBLEMS ARISING FROM ITS USE. 41207151Smarius 42207151SmariusDerivative works are acceptable, even for commercial purposes, so long as 43207151Smarius(1) they include prominent notice that the work is derivative, and (2) they 44207151Smariusinclude prominent notice akin to these four paragraphs for those parts of 45207151Smariusthis code that are retained. 46207151Smarius 47207151Smarius=============================================================================== 48207151Smarius*/ 49207151Smarius 50207151Smarius#include <sys/cdefs.h> 51207151Smarius__FBSDID("$FreeBSD$"); 52207151Smarius 53207151Smarius#pragma STDC FENV_ACCESS ON 54207151Smarius#include <fenv.h> 55207151Smarius#include <ieeefp.h> 56207151Smarius#include "milieu.h" 57207151Smarius#include "systflags.h" 58207151Smarius 59207151Smarius/* 60207151Smarius------------------------------------------------------------------------------- 61207151SmariusClears the system's IEC/IEEE floating-point exception flags. Returns the 62207151Smariusprevious value of the flags. 63207151Smarius------------------------------------------------------------------------------- 64207151Smarius*/ 65207151Smariusint8 syst_float_flags_clear( void ) 66207151Smarius{ 67207151Smarius fexcept_t flags; 68207151Smarius 69207151Smarius fegetexceptflag(&flags, FE_ALL_EXCEPT); 70207151Smarius feclearexcept(FE_ALL_EXCEPT); 71207151Smarius return (flags >> 5); 72207151Smarius} 73207151Smarius 74