1#include "libm.h"
2
3#if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
4long double truncl(long double x) {
5    return trunc(x);
6}
7#elif (LDBL_MANT_DIG == 64 || LDBL_MANT_DIG == 113) && LDBL_MAX_EXP == 16384
8
9static const long double toint = 1 / LDBL_EPSILON;
10
11long double truncl(long double x) {
12    union ldshape u = {x};
13    int e = u.i.se & 0x7fff;
14    int s = u.i.se >> 15;
15    long double y;
16
17    if (e >= 0x3fff + LDBL_MANT_DIG - 1)
18        return x;
19    if (e <= 0x3fff - 1) {
20        FORCE_EVAL(x + 0x1p120f);
21        return x * 0;
22    }
23    /* y = int(|x|) - |x|, where int(|x|) is an integer neighbor of |x| */
24    if (s)
25        x = -x;
26    y = x + toint - toint - x;
27    if (y > 0)
28        y -= 1;
29    x += y;
30    return s ? -x : x;
31}
32#endif
33