| The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1 | /*- |
| 2 | * Copyright (c) 2005 David Schultz <das@FreeBSD.ORG> |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
| 8 | * 1. Redistributions of source code must retain the above copyright |
| 9 | * notice, this list of conditions and the following disclaimer. |
| 10 | * 2. Redistributions in binary form must reproduce the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer in the |
| 12 | * documentation and/or other materials provided with the distribution. |
| 13 | * |
| 14 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
| 15 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 16 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 17 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| 18 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 19 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 20 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 21 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 22 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 23 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 24 | * SUCH DAMAGE. |
| 25 | */ |
| 26 | |
| 27 | #include <sys/cdefs.h> |
| 28 | #include <fenv.h> |
| 29 | #include <math.h> |
| 30 | |
| 31 | #ifndef type |
| 32 | /* __FBSDID("$FreeBSD: src/lib/msun/src/s_lrint.c,v 1.1 2005/01/11 23:12:55 das Exp $"); */ |
| 33 | #define type double |
| 34 | #define roundit rint |
| 35 | #define dtype long |
| 36 | #define fn lrint |
| 37 | #endif |
| 38 | |
| 39 | /* |
| 40 | * C99 says we should not raise a spurious inexact exception when an |
| 41 | * invalid exception is raised. Unfortunately, the set of inputs |
| 42 | * that overflows depends on the rounding mode when 'dtype' has more |
| 43 | * significant bits than 'type'. Hence, we bend over backwards for the |
| 44 | * sake of correctness; an MD implementation could be more efficient. |
| 45 | */ |
| 46 | dtype |
| 47 | fn(type x) |
| 48 | { |
| 49 | fenv_t env; |
| 50 | dtype d; |
| 51 | |
| 52 | feholdexcept(&env); |
| 53 | d = (dtype)roundit(x); |
| 54 | if (fetestexcept(FE_INVALID)) |
| 55 | feclearexcept(FE_INEXACT); |
| 56 | feupdateenv(&env); |
| 57 | return (d); |
| 58 | } |