| #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 |
| |
| static const long double toint = 1/LDBL_EPSILON; |
| |
| 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 |
