text: /*-
   * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
   *
   * Copyright (c) 2004 David Schultz <das@FreeBSD.ORG>
   * 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.
   */
  
  #include <sys/cdefs.h>
  
  #include <fenv.h>
  #include <math.h>
  
  /*
   * We save and restore the floating-point environment to avoid raising
   * an inexact exception.  We can get away with using fesetenv()
   * instead of feclearexcept()/feupdateenv() to restore the environment
   * because the only exception defined for rint() is overflow, and
   * rounding can't overflow as long as emax >= p.
   *
   * The volatile keyword is needed below because clang incorrectly assumes
   * that rint won't raise any floating-point exceptions. Declaring ret volatile
   * is sufficient to trick the compiler into doing the right thing.
   */
  #define	DECL(type, fn, rint)	\
  type				\
  fn(type x)			\
  {				\
  	volatile type ret;	\
  	fenv_t env;		\
  				\
  	fegetenv(&env);		\
  	ret = rint(x);		\
  	fesetenv(&env);		\
  	return (ret);		\
  }
  
  DECL(double, nearbyint, rint)
  DECL(float, nearbyintf, rintf)
  DECL(long double, nearbyintl, rintl)
  