blob: 4b03a4be0aa462b915c9ad5c85144771a706fcdc (
plain) (
blame)
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
|
#include "libm.h"
#if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
long double modfl(long double x, long double *iptr)
{
double d;
long double r;
r = modf(x, &d);
*iptr = d;
return r;
}
#elif (LDBL_MANT_DIG == 64 || LDBL_MANT_DIG == 113) && LDBL_MAX_EXP == 16384
#if LDBL_MANT_DIG == 64
#define TOINT 0x1p63
#elif LDBL_MANT_DIG == 113
#define TOINT 0x1p112
#endif
long double modfl(long double x, long double *iptr)
{
union ldshape u = {x};
int e = (u.i.se & 0x7fff) - 0x3fff;
int s = u.i.se >> 15;
long double absx;
long double y;
/* no fractional part */
if (e >= LDBL_MANT_DIG-1) {
*iptr = x;
if (isnan(x))
return x;
return s ? -0.0 : 0.0;
}
/* no integral part*/
if (e < 0) {
*iptr = s ? -0.0 : 0.0;
return x;
}
/* raises spurious inexact */
absx = s ? -x : x;
y = absx + TOINT - TOINT - absx;
if (y == 0) {
*iptr = x;
return s ? -0.0 : 0.0;
}
if (y > 0)
y -= 1;
if (s)
y = -y;
*iptr = x + y;
return -y;
}
#endif
|
