blob: 3eedb0839713144cf1fbb2f2e05cd7ba6f04aebc (
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
|
#include "libm.h"
#if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
long double truncl(long double x)
{
return trunc(x);
}
#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 truncl(long double x)
{
union ldshape u = {x};
int e = u.i.se & 0x7fff;
int s = u.i.se >> 15;
long double y;
if (e >= 0x3fff+LDBL_MANT_DIG-1)
return x;
if (e <= 0x3fff-1) {
FORCE_EVAL(x + 0x1p120f);
return x*0;
}
/* y = int(|x|) - |x|, where int(|x|) is an integer neighbor of |x| */
if (s)
x = -x;
y = x + TOINT - TOINT - x;
if (y > 0)
y -= 1;
x += y;
return s ? -x : x;
}
#endif
|
