newlib/libm/ld128/b_tgammal.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
   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  * $FreeBSD$
  29  */
  30
  31 #include <float.h>
  32 #include <math.h>
  33
  34 /*
  35  * If long double is not the same size as double, then these will lose
  36  * precision and we should emit a warning whenever something links against
  37  * them.
  38  */
  39 #if (LDBL_MANT_DIG > 53)
  40 #define WARN_IMPRECISE(x) \
  41         __warn_references(x, # x " has lower than advertised precision");
  42 #else
  43 #define WARN_IMPRECISE(x)
  44 #endif
  45 /*
  46  * Declare the functions as weak variants so that other libraries providing
  47  * real versions can override them.
  48  */
  49 #define DECLARE_WEAK(x)\
  50         __weak_reference(imprecise_## x, x);\
  51         WARN_IMPRECISE(x)
  52
  53 #define DECLARE_IMPRECISE(f) \
  54         long double imprecise_ ## f ## l(long double v) { return f(v); }\
  55         DECLARE_WEAK(f ## l)
  56
  57 DECLARE_IMPRECISE(tgamma);