1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
|
/* s_nextafterl.c -- long double version of s_nextafter.c.
* Conversion to IEEE quad long double by Jakub Jelinek, jj@ultra.linux.cz.
*/
/*
* ====================================================
* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
*
* Developed at SunPro, a Sun Microsystems, Inc. business.
* Permission to use, copy, modify, and distribute this
* software is freely granted, provided that this notice
* is preserved.
* ====================================================
*/
#if defined(LIBM_SCCS) && !defined(lint)
static char rcsid[] = "$NetBSD: $";
#endif
/* IEEE functions
* nextafterl(x,y)
* return the next machine floating-point number of x in the
* direction toward y.
* Special cases:
*/
#include "math.h"
#include "math_private.h"
#include <math_ldbl_opt.h>
#ifdef __STDC__
long double __nextafterl(long double x, long double y)
#else
long double __nextafterl(x,y)
long double x,y;
#endif
{
int64_t hx,hy,ihx,ihy,ilx,ily;
u_int64_t lx,ly;
GET_LDOUBLE_WORDS64(hx,lx,x);
GET_LDOUBLE_WORDS64(hy,ly,y);
ihx = hx&0x7fffffffffffffffLL; /* |hx| */
ilx = lx&0x7fffffffffffffffLL; /* |lx| */
ihy = hy&0x7fffffffffffffffLL; /* |hy| */
ily = ly&0x7fffffffffffffffLL; /* |ly| */
if((((ihx&0x7ff0000000000000LL)==0x7ff0000000000000LL)&&
((ihx&0x000fffffffffffffLL)!=0)) || /* x is nan */
(((ihy&0x7ff0000000000000LL)==0x7ff0000000000000LL)&&
((ihy&0x000fffffffffffffLL)!=0))) /* y is nan */
return x+y; /* signal the nan */
if(x==y)
return y; /* x=y, return y */
if(ihx == 0 && ilx == 0) { /* x == 0 */
SET_LDOUBLE_WORDS64(x,hy&0x8000000000000000ULL,1);/* return +-minsubnormal */
y = x*x;
if(y==x) return y; else return x; /* raise underflow flag */
}
if(ihx>=0) { /* x > 0 */
if(ihx>ihy||((ihx==ihy)&&(ilx>ily))) { /* x > y, x -= ulp */
if(ilx==0)
hx--;
else
lx--;
} else { /* x < y, x += ulp */
if((hx==0x7fefffffffffffffLL)&&(lx==0x7c8ffffffffffffeLL))
{
SET_LDOUBLE_WORDS64(x,0x7ff0000000000000,0x8000000000000000);
return x;
}
else if((hx==0xffefffffffffffffLL)&&(lx==0xfc8ffffffffffffeLL))
{
SET_LDOUBLE_WORDS64(x,0xfff0000000000000,0x8000000000000000);
return x;
}
else if((lx&0x7fffffffffffffff)==0) hx++;
else
lx++;
}
} else { /* x < 0 */
if(ihy>=0||ihx>ihy||((ihx==ihy)&&(ilx>ily))){/* x < y, x -= ulp */
if((lx&0x7fffffffffffffff)==0)
hx--;
else
lx--;
} else { /* x > y, x += ulp */
if((lx&0x7fffffffffffffff)==0) hx++;
else
lx++;
}
}
hy = hx&0x7ff0000000000000LL;
if(hy==0x7ff0000000000000LL) return x+x;/* overflow */
if(hy==0) { /* underflow */
y = x*x;
if(y!=x) { /* raise underflow flag */
SET_LDOUBLE_WORDS64(y,hx,lx);
return y;
}
}
SET_LDOUBLE_WORDS64(x,hx,lx);
return x;
}
strong_alias (__nextafterl, __nexttowardl)
long_double_symbol (libm, __nextafterl, nextafterl);
long_double_symbol (libm, __nexttowardl, nexttowardl);
|
