text: /*-
   * Copyright (c) 2013 David Chisnall
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   *
   * $FreeBSD: head/lib/msun/src/imprecise.c 255294 2013-09-06 07:58:23Z theraven $
   */
  
  #include <float.h>
  #include <math.h>
  
  /*
   * If long double is not the same size as double, then these will lose
   * precision and we should emit a warning whenever something links against
   * them.
   */
  #if (LDBL_MANT_DIG > 53)
  #define WARN_IMPRECISE(x) \
  	__warn_references(x, # x " has lower than advertised precision");
  #else
  #define WARN_IMPRECISE(x)
  #endif
  /*
   * Declare the functions as weak variants so that other libraries providing
   * real versions can override them.
   */
  #define	DECLARE_WEAK(x)\
  	__weak_reference(imprecise_## x, x);\
  	WARN_IMPRECISE(x)
  
  #define DECLARE_FORMER_IMPRECISE(f) \
  	__asm__(".symver imprecise_" #f "l," #f "l@DF306.1"); \
  	long double imprecise_ ## f ## l(long double v) { return f(v); }
  
  #pragma GCC diagnostic push
  #pragma GCC diagnostic ignored "-Wmissing-prototypes"
  
  __asm__(".symver imprecise_powl,powl@DF306.1");
  long double
  imprecise_powl(long double x, long double y) { return pow(x, y); }
  
  DECLARE_FORMER_IMPRECISE(cosh);
  DECLARE_FORMER_IMPRECISE(erfc);
  DECLARE_FORMER_IMPRECISE(erf);
  DECLARE_FORMER_IMPRECISE(sinh);
  DECLARE_FORMER_IMPRECISE(tanh);
  DECLARE_FORMER_IMPRECISE(tgamma);
  DECLARE_FORMER_IMPRECISE(lgamma);
  
  #pragma GCC diagnostic pop
  