1#include "libm.h"
2
3#if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
4long double truncl(long double x)
5{
6	return trunc(x);
7}
8#elif (LDBL_MANT_DIG == 64 || LDBL_MANT_DIG == 113) && LDBL_MAX_EXP == 16384
9
10static const long double toint = 1/LDBL_EPSILON;
11
12long double truncl(long double x)
13{
14	union ldshape u = {x};
15	int e = u.i.se & 0x7fff;
16	int s = u.i.se >> 15;
17	long double y;
18
19	if (e >= 0x3fff+LDBL_MANT_DIG-1)
20		return x;
21	if (e <= 0x3fff-1) {
22		FORCE_EVAL(x + 0x1p120f);
23		return x*0;
24	}
25	/* y = int(|x|) - |x|, where int(|x|) is an integer neighbor of |x| */
26	if (s)
27		x = -x;
28	y = x + toint - toint - x;
29	if (y > 0)
30		y -= 1;
31	x += y;
32	return s ? -x : x;
33}
34#endif
35