| /*- |
| * 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> |
| __FBSDID("$FreeBSD$"); |
| |
| #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. |
| */ |
| #define DECL(type, fn, rint) \ |
| type \ |
| fn(type x) \ |
| { \ |
| 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) |
