vx32

Local 9vx git repository for patches.
git clone git://r-36.net/vx32
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isinf.c (2982B)

      1 /*-
      2  * Copyright (c) 2003 Mike Barcroft <mike@FreeBSD.org>
      3  * Copyright (c) 2002 David Schultz <dschultz@uclink.Berkeley.EDU>
      4  * Copyright (c) 2004 David Schultz <das@FreeBSD.ORG>
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  * SUCH DAMAGE.
     27  *
     28  * $FreeBSD: src/lib/libc/gen/isinf.c,v 1.2 2004/07/10 15:52:26 marcel Exp $
     29  */
     30 
     31 #include <math.h>
     32 
     33 union IEEEf2bits {
     34 	float	f;
     35 	struct {
     36 		unsigned int	man	:23;
     37 		unsigned int	exp	:8;
     38 		unsigned int	sign	:1;
     39 	} bits;
     40 };
     41 
     42 #define	DBL_MANH_SIZE	20
     43 #define	DBL_MANL_SIZE	32
     44 
     45 union IEEEd2bits {
     46 	double	d;
     47 	struct {
     48 		unsigned int	manl	:32;
     49 		unsigned int	manh	:20;
     50 		unsigned int	exp	:11;
     51 		unsigned int	sign	:1;
     52 	} bits;
     53 };
     54 
     55 union IEEEl2bits {
     56 	long double	e;
     57 	struct {
     58 		unsigned int	manl	:32;
     59 		unsigned int	manh	:32;
     60 		unsigned int	exp	:15;
     61 		unsigned int	sign	:1;
     62 		unsigned int	junk	:16;
     63 	} bits;
     64 };
     65 
     66 #define	mask_nbit_l(u)	((u).bits.manh &= 0x7fffffff)
     67 
     68 #define	LDBL_MANH_SIZE	32
     69 #define	LDBL_MANL_SIZE	32
     70 
     71 #define	LDBL_TO_ARRAY32(u, a) do {			\
     72 	(a)[0] = (uint32_t)(u).bits.manl;		\
     73 	(a)[1] = (uint32_t)(u).bits.manh;		\
     74 } while(0)
     75 
     76 /*
     77  * XXX These routines belong in libm, but they must remain in libc for
     78  *     binary compat until we can bump libm's major version number.
     79  */
     80 
     81 #undef isinf
     82 int
     83 isinf(double d)
     84 {
     85 	union IEEEd2bits u;
     86 
     87 	u.d = d;
     88 	return (u.bits.exp == 2047 && u.bits.manl == 0 && u.bits.manh == 0);
     89 }
     90 
     91 int
     92 __isinff(float f)
     93 {
     94 	union IEEEf2bits u;
     95 
     96 	u.f = f;
     97 	return (u.bits.exp == 255 && u.bits.man == 0);
     98 }
     99 
    100 int
    101 __isinfl(long double e)
    102 {
    103 	union IEEEl2bits u;
    104 
    105 	u.e = e;
    106 	mask_nbit_l(u);
    107 #ifndef __alpha__
    108 	return (u.bits.exp == 32767 && u.bits.manl == 0 && u.bits.manh == 0);
    109 #else
    110 	return (u.bits.exp == 2047 && u.bits.manl == 0 && u.bits.manh == 0);
    111 #endif
    112 }