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      1 /*-
      2  * SPDX-License-Identifier: BSD-2-Clause
      3  *
      4  * Copyright (c) 2013 David Chisnall
      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 <float.h>
     30 #include <math.h>
     31 
     32 /*
     33  * If long double is not the same size as double, then these will lose
     34  * precision and we should emit a warning whenever something links against
     35  * them.
     36  */
     37 #if (LDBL_MANT_DIG > 53)
     38 #define WARN_IMPRECISE(x) \
     39 	__warn_references(x, # x " has lower than advertised precision");
     40 #else
     41 #define WARN_IMPRECISE(x)
     42 #endif
     43 /*
     44  * Declare the functions as weak variants so that other libraries providing
     45  * real versions can override them.
     46  */
     47 #define	DECLARE_WEAK(x)\
     48 	__weak_alias(x, imprecise_## x);\
     49 	WARN_IMPRECISE(x)
     50 
     51 #define DECLARE_IMPRECISE(f) \
     52 	long double imprecise_ ## f ## l(long double v); \
     53 	long double imprecise_ ## f ## l(long double v) { return f(v); }\
     54 	DECLARE_WEAK(f ## l)
     55 
     56 DECLARE_IMPRECISE(tgamma);
     57