1 /* $OpenBSD: s_lrintl.c,v 1.2 2012/12/05 23:20:04 deraadt Exp $ */ 2 3 /*- 4 * Copyright (c) 2005 David Schultz <das@FreeBSD.ORG> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <fenv.h> 30 #include <math.h> 31 32 #ifndef type 33 #if 0 34 __FBSDID("$FreeBSD: src/lib/msun/src/s_lrint.c,v 1.1 2005/01/11 23:12:55 das Exp $"); 35 #endif 36 #define type long double 37 #define roundit rintl 38 #define dtype long 39 #define fn lrintl 40 #endif 41 42 /* 43 * C99 says we should not raise a spurious inexact exception when an 44 * invalid exception is raised. Unfortunately, the set of inputs 45 * that overflows depends on the rounding mode when 'dtype' has more 46 * significant bits than 'type'. Hence, we bend over backwards for the 47 * sake of correctness; an MD implementation could be more efficient. 48 */ 49 dtype 50 fn(type x) 51 { 52 fenv_t env; 53 dtype d; 54 55 feholdexcept(&env); 56 d = (dtype)roundit(x); 57 if (fetestexcept(FE_INVALID)) 58 feclearexcept(FE_INEXACT); 59 feupdateenv(&env); 60 return (d); 61 } 62