125c28e83SPiotr Jasiukajtis /*
225c28e83SPiotr Jasiukajtis  * CDDL HEADER START
325c28e83SPiotr Jasiukajtis  *
425c28e83SPiotr Jasiukajtis  * The contents of this file are subject to the terms of the
525c28e83SPiotr Jasiukajtis  * Common Development and Distribution License (the "License").
625c28e83SPiotr Jasiukajtis  * You may not use this file except in compliance with the License.
725c28e83SPiotr Jasiukajtis  *
825c28e83SPiotr Jasiukajtis  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
925c28e83SPiotr Jasiukajtis  * or http://www.opensolaris.org/os/licensing.
1025c28e83SPiotr Jasiukajtis  * See the License for the specific language governing permissions
1125c28e83SPiotr Jasiukajtis  * and limitations under the License.
1225c28e83SPiotr Jasiukajtis  *
1325c28e83SPiotr Jasiukajtis  * When distributing Covered Code, include this CDDL HEADER in each
1425c28e83SPiotr Jasiukajtis  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
1525c28e83SPiotr Jasiukajtis  * If applicable, add the following below this CDDL HEADER, with the
1625c28e83SPiotr Jasiukajtis  * fields enclosed by brackets "[]" replaced with your own identifying
1725c28e83SPiotr Jasiukajtis  * information: Portions Copyright [yyyy] [name of copyright owner]
1825c28e83SPiotr Jasiukajtis  *
1925c28e83SPiotr Jasiukajtis  * CDDL HEADER END
2025c28e83SPiotr Jasiukajtis  */
2125c28e83SPiotr Jasiukajtis 
2225c28e83SPiotr Jasiukajtis /*
2325c28e83SPiotr Jasiukajtis  * Copyright 2011 Nexenta Systems, Inc.  All rights reserved.
2425c28e83SPiotr Jasiukajtis  */
2525c28e83SPiotr Jasiukajtis /*
2625c28e83SPiotr Jasiukajtis  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
2725c28e83SPiotr Jasiukajtis  * Use is subject to license terms.
2825c28e83SPiotr Jasiukajtis  */
2925c28e83SPiotr Jasiukajtis 
30ddc0e0b5SRichard Lowe #pragma weak __nextafterl = nextafterl
3125c28e83SPiotr Jasiukajtis 
3225c28e83SPiotr Jasiukajtis #include "libm.h"
3325c28e83SPiotr Jasiukajtis #include <float.h>		/* LDBL_MAX, LDBL_MIN */
3425c28e83SPiotr Jasiukajtis 
3525c28e83SPiotr Jasiukajtis #if defined(__sparc)
3625c28e83SPiotr Jasiukajtis #define	n0	0
3725c28e83SPiotr Jasiukajtis #define	n1	1
3825c28e83SPiotr Jasiukajtis #define	n2	2
3925c28e83SPiotr Jasiukajtis #define	n3	3
4025c28e83SPiotr Jasiukajtis #define	X86PDNRM1(x)
4125c28e83SPiotr Jasiukajtis #define	INC(px)	{ \
4225c28e83SPiotr Jasiukajtis 			if (++px[n3] == 0) \
4325c28e83SPiotr Jasiukajtis 				if (++px[n2] == 0) \
4425c28e83SPiotr Jasiukajtis 					if (++px[n1] == 0) \
4525c28e83SPiotr Jasiukajtis 						++px[n0]; \
4625c28e83SPiotr Jasiukajtis 		}
4725c28e83SPiotr Jasiukajtis #define	DEC(px)	{ \
4825c28e83SPiotr Jasiukajtis 			if (--px[n3] == 0xffffffff) \
4925c28e83SPiotr Jasiukajtis 				if (--px[n2] == 0xffffffff) \
5025c28e83SPiotr Jasiukajtis 					if (--px[n1] == 0xffffffff) \
5125c28e83SPiotr Jasiukajtis 						--px[n0]; \
5225c28e83SPiotr Jasiukajtis 		}
5325c28e83SPiotr Jasiukajtis #elif defined(__x86)
5425c28e83SPiotr Jasiukajtis #define	n0	2
5525c28e83SPiotr Jasiukajtis #define	n1	1
5625c28e83SPiotr Jasiukajtis #define	n2	0
5725c28e83SPiotr Jasiukajtis #define	n3	0
5825c28e83SPiotr Jasiukajtis /*
5925c28e83SPiotr Jasiukajtis  * if pseudo-denormal, replace by the equivalent normal
6025c28e83SPiotr Jasiukajtis  */
6125c28e83SPiotr Jasiukajtis #define	X86PDNRM1(x)	if (XBIASED_EXP(x) == 0 && (((int *) &x)[1] & \
6225c28e83SPiotr Jasiukajtis 				0x80000000) != 0) \
6325c28e83SPiotr Jasiukajtis 				((int *) &x)[2] |= 1
6425c28e83SPiotr Jasiukajtis #define	INC(px)	{ \
6525c28e83SPiotr Jasiukajtis 			if (++px[n2] == 0) \
6625c28e83SPiotr Jasiukajtis 				if ((++px[n1] & ~0x80000000) == 0) \
6725c28e83SPiotr Jasiukajtis 					px[n1] = 0x80000000, ++px[n0]; \
6825c28e83SPiotr Jasiukajtis 		}
6925c28e83SPiotr Jasiukajtis #define	DEC(px)	{ \
7025c28e83SPiotr Jasiukajtis 			if (--px[n2] == 0xffffffff) \
7125c28e83SPiotr Jasiukajtis 				if (--px[n1] == 0x7fffffff) \
7225c28e83SPiotr Jasiukajtis 					if ((--px[n0] & 0x7fff) != 0) \
7325c28e83SPiotr Jasiukajtis 						px[n1] |= 0x80000000; \
7425c28e83SPiotr Jasiukajtis 		}
7525c28e83SPiotr Jasiukajtis #endif
7625c28e83SPiotr Jasiukajtis 
7725c28e83SPiotr Jasiukajtis long double
nextafterl(long double x,long double y)7825c28e83SPiotr Jasiukajtis nextafterl(long double x, long double y) {
7925c28e83SPiotr Jasiukajtis 	int *px = (int *) &x;
8025c28e83SPiotr Jasiukajtis 	int *py = (int *) &y;
8125c28e83SPiotr Jasiukajtis 
8225c28e83SPiotr Jasiukajtis 	if (x == y)
8325c28e83SPiotr Jasiukajtis 		return (y);		/* C99 requirement */
8425c28e83SPiotr Jasiukajtis 	if (x != x || y != y)
8525c28e83SPiotr Jasiukajtis 		return (x * y);
8625c28e83SPiotr Jasiukajtis 
8725c28e83SPiotr Jasiukajtis 	if (ISZEROL(x)) {	/* x == 0.0 */
8825c28e83SPiotr Jasiukajtis 		px[n0] = py[n0] & XSGNMSK;
8925c28e83SPiotr Jasiukajtis 		px[n1] = px[n2] = 0;
9025c28e83SPiotr Jasiukajtis 		px[n3] = 1;
9125c28e83SPiotr Jasiukajtis 	} else {
9225c28e83SPiotr Jasiukajtis 		X86PDNRM1(x);
9325c28e83SPiotr Jasiukajtis 		if ((px[n0] & XSGNMSK) == 0) {	/* x > 0.0 */
9425c28e83SPiotr Jasiukajtis 			if (x > y)	/* x > y */
9525c28e83SPiotr Jasiukajtis 				DEC(px)
9625c28e83SPiotr Jasiukajtis 			else
9725c28e83SPiotr Jasiukajtis 				INC(px)
9825c28e83SPiotr Jasiukajtis 		} else {
9925c28e83SPiotr Jasiukajtis 			if (x < y)	/* x < y */
10025c28e83SPiotr Jasiukajtis 				DEC(px)
10125c28e83SPiotr Jasiukajtis 			else
10225c28e83SPiotr Jasiukajtis 				INC(px)
10325c28e83SPiotr Jasiukajtis 		}
10425c28e83SPiotr Jasiukajtis 	}
10525c28e83SPiotr Jasiukajtis #ifndef lint
10625c28e83SPiotr Jasiukajtis 	{
107*862246c1SToomas Soome 		volatile long double dummy __unused;
10825c28e83SPiotr Jasiukajtis 		int k = XBIASED_EXP(x);
10925c28e83SPiotr Jasiukajtis 
11025c28e83SPiotr Jasiukajtis 		if (k == 0)
11125c28e83SPiotr Jasiukajtis 			dummy = LDBL_MIN * copysignl(LDBL_MIN, x);
11225c28e83SPiotr Jasiukajtis 		else if (k == 0x7fff)
11325c28e83SPiotr Jasiukajtis 			dummy = LDBL_MAX * copysignl(LDBL_MAX, x);
11425c28e83SPiotr Jasiukajtis 	}
11525c28e83SPiotr Jasiukajtis #endif
11625c28e83SPiotr Jasiukajtis 	return (x);
11725c28e83SPiotr Jasiukajtis }
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