1 #include "libm.h"
2 
3 #if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
truncl(long double x)4 long 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 
10 static const long double toint = 1/LDBL_EPSILON;
11 
truncl(long double x)12 long 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