s_lrint.c - vx32 - Local 9vx git repository for patches.
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       ---
       s_lrint.c (2049B)
       ---
            1 /*-
            2  * Copyright (c) 2005 David Schultz <das@FreeBSD.ORG>
            3  * All rights reserved.
            4  *
            5  * Redistribution and use in source and binary forms, with or without
            6  * modification, are permitted provided that the following conditions
            7  * are met:
            8  * 1. Redistributions of source code must retain the above copyright
            9  *    notice, this list of conditions and the following disclaimer.
           10  * 2. Redistributions in binary form must reproduce the above copyright
           11  *    notice, this list of conditions and the following disclaimer in the
           12  *    documentation and/or other materials provided with the distribution.
           13  *
           14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
           15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
           16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
           17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
           18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
           19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
           20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
           21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
           22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
           23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
           24  * SUCH DAMAGE.
           25  */
           26 
           27 #include <fenv.h>
           28 #include <math.h>
           29 
           30 #ifndef type
           31 #define type                double
           32 #define        roundit                rint
           33 #define dtype                long
           34 #define        fn                lrint
           35 #endif
           36 
           37 /*
           38  * C99 says we should not raise a spurious inexact exception when an
           39  * invalid exception is raised.  Unfortunately, the set of inputs
           40  * that overflows depends on the rounding mode when 'dtype' has more
           41  * significant bits than 'type'.  Hence, we bend over backwards for the
           42  * sake of correctness; an MD implementation could be more efficient.
           43  */
           44 dtype
           45 fn(type x)
           46 {
           47         fenv_t env;
           48         dtype d;
           49 
           50         feholdexcept(&env);
           51         d = (dtype)roundit(x);
           52         if (fetestexcept(FE_INVALID))
           53                 feclearexcept(FE_INEXACT);
           54         feupdateenv(&env);
           55         return (d);
           56 }