GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: lib/libm/src/s_lround.c Lines: 25 25 100.0 %
Date: 2017-11-13 Branches: 14 18 77.8 %

Line Branch Exec Source
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/*	$OpenBSD: s_lround.c,v 1.8 2016/09/12 19:47:02 guenther Exp $	*/
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/* $NetBSD: lround.c,v 1.2 2004/10/13 15:18:32 drochner Exp $ */
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/*-
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 * Copyright (c) 2004
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 *	Matthias Drochner. All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 * 1. Redistributions of source code must retain the above copyright
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 *    notice, this list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright
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 *    notice, this list of conditions and the following disclaimer in the
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 *    documentation and/or other materials provided with the distribution.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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 * SUCH DAMAGE.
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 */
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#include <sys/types.h>
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#include <sys/limits.h>
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#include <float.h>
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#include <math.h>
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#include <ieeefp.h>
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#include <machine/ieee.h>
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#include "math_private.h"
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#ifndef LROUNDNAME
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#define LROUNDNAME lround
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#define RESTYPE long int
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#define RESTYPE_MIN LONG_MIN
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#define RESTYPE_MAX LONG_MAX
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#endif
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#define RESTYPE_BITS (sizeof(RESTYPE) * 8)
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RESTYPE
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LROUNDNAME(double x)
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{
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	u_int32_t i0, i1;
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	int e, s, shift;
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	RESTYPE res;
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	GET_HIGH_WORD(i0, x);
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	e = i0 >> DBL_FRACHBITS;
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	s = e >> DBL_EXPBITS;
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	e = (e & 0x7ff) - DBL_EXP_BIAS;
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	/* 1.0 x 2^-1 is the smallest number which can be rounded to 1 */
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	if (e < -1)
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		return (0);
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	/* 1.0 x 2^31 (or 2^63) is already too large */
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	if (e >= (int)RESTYPE_BITS - 1)
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		return (s ? RESTYPE_MIN : RESTYPE_MAX); /* ??? unspecified */
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	/* >= 2^52 is already an exact integer */
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	if (e < DBL_FRACBITS) {
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		/* add 0.5, extraction below will truncate */
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		x += (s ? -0.5 : 0.5);
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	}
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	EXTRACT_WORDS(i0, i1, x);
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	e = ((i0 >> DBL_FRACHBITS) & 0x7ff) - DBL_EXP_BIAS;
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	i0 &= 0xfffff;
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	i0 |= (1 << DBL_FRACHBITS);
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	shift = e - DBL_FRACBITS;
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	if (shift >=0)
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		res = (shift < RESTYPE_BITS ? (RESTYPE)i1 << shift : 0);
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	else
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		res = (shift > -RESTYPE_BITS ? (RESTYPE)i1 >> -shift : 0);
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	shift += 32;
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	if (shift >=0)
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		res |= (shift < RESTYPE_BITS ? (RESTYPE)i0 << shift : 0);
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	else
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		res |= (shift > -RESTYPE_BITS ? (RESTYPE)i0 >> -shift : 0);
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	return (s ? -res : res);
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}
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DEF_STD(LROUNDNAME);
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LDBL_MAYBE_UNUSED_CLONE(LROUNDNAME);