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File: [cvs.NetBSD.org] / src / lib / libc / gen / infinityl_ieee754.c (download)

Revision 1.1, Mon Jan 17 23:53:03 2011 UTC (2 years, 4 months ago) by matt
Branch: MAIN
CVS Tags: yamt-pagecache-base8, yamt-pagecache-base7, yamt-pagecache-base6, yamt-pagecache-base5, yamt-pagecache-base4, yamt-pagecache-base3, yamt-pagecache-base2, yamt-pagecache-base, yamt-pagecache, tls-maxphys-nbase, tls-maxphys-base, tls-maxphys, netbsd-6-base, netbsd-6-1-RELEASE, netbsd-6-1-RC4, netbsd-6-1-RC3, netbsd-6-1-RC2, netbsd-6-1-RC1, netbsd-6-1, netbsd-6-0-RELEASE, netbsd-6-0-RC2, netbsd-6-0-RC1, netbsd-6-0-2-RELEASE, netbsd-6-0-1-RELEASE, netbsd-6-0, netbsd-6, matt-nb6-plus-nbase, matt-nb6-plus-base, matt-nb6-plus, cherry-xenmp-base, cherry-xenmp, bouyer-quota2-nbase, bouyer-quota2-base, bouyer-quota2, agc-symver-base, agc-symver, HEAD
Branch point for: matt-nb5-mips64 

Make the MIPS N32/N64 ABIs properly support 128-bit long doubles.  With this
change, we should be fully conformant with the N32 and N64 ABIs.
Add {fpclassify,infinity,isnan,ininf,signbit}l_ieee754.c back to lib/libc/gen.
Note that infinityl_ieee754.c will work with either 64-bit, 80-bit, or
128-bit long doubles.

/*	$NetBSD: infinityl_ieee754.c,v 1.1 2011/01/17 23:53:03 matt Exp $	*/

/*
 * IEEE-compatible infinityl.c for 64-bit or 128-bit long double format.
 * This is public domain.
 */

#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: infinityl_ieee754.c,v 1.1 2011/01/17 23:53:03 matt Exp $");
#endif /* LIBC_SCCS and not lint */

#include <math.h>
#include <machine/endian.h>
#include <machine/ieee.h>

#ifdef __HAVE_LONG_DOUBLE
#define	LDBL_EXPBITS		EXT_EXPBITS
#define	LDBL_EXP_INFNAN		EXT_EXP_INFNAN
#else
#define	LDBL_EXPBITS		DBL_EXPBITS
#define	LDBL_EXP_INFNAN		DBL_EXP_INFNAN
#endif

#define	EXP_INFNAN		(LDBL_EXP_INFNAN << (31 - LDBL_EXPBITS))

const union __long_double_u __infinityl = { {
#if BYTE_ORDER == BIG_ENDIAN
	[0] = (EXP_INFNAN >> 24) & 0x7f,
	[1] = (EXP_INFNAN >> 16) & 0xff,
	[2] = (EXP_INFNAN >>  8) & 0xff,
	[3] = (EXP_INFNAN >>  0) & 0xff,
#else
	[sizeof(long double)-4] = (EXP_INFNAN >>  0) & 0xff,
	[sizeof(long double)-3] = (EXP_INFNAN >>  8) & 0xff,
	[sizeof(long double)-2] = (EXP_INFNAN >> 16) & 0xff,
	[sizeof(long double)-1] = (EXP_INFNAN >> 24) & 0x7f,
#endif
} };