| /*- |
| * Copyright (c) 2005 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> |
| |
| #ifndef type |
| __FBSDID("$FreeBSD$"); |
| #define type double |
| #define roundit rint |
| #define dtype long |
| #define fn lrint |
| #endif |
| |
| /* |
| * C99 says we should not raise a spurious inexact exception when an |
| * invalid exception is raised. Unfortunately, the set of inputs |
| * that overflows depends on the rounding mode when 'dtype' has more |
| * significant bits than 'type'. Hence, we bend over backwards for the |
| * sake of correctness; an MD implementation could be more efficient. |
| */ |
| dtype |
| fn(type x) |
| { |
| fenv_t env; |
| dtype d; |
| |
| feholdexcept(&env); |
| d = (dtype)roundit(x); |
| if (fetestexcept(FE_INVALID)) |
| feclearexcept(FE_INEXACT); |
| feupdateenv(&env); |
| return (d); |
| } |
