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