OLD | NEW |
1 #include "libm.h" | 1 #include "libm.h" |
2 | 2 |
3 #if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024 | 3 #if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024 |
4 long double roundl(long double x) | 4 long double roundl(long double x) { |
5 { | 5 return round(x); |
6 » return round(x); | |
7 } | 6 } |
8 #elif (LDBL_MANT_DIG == 64 || LDBL_MANT_DIG == 113) && LDBL_MAX_EXP == 16384 | 7 #elif (LDBL_MANT_DIG == 64 || LDBL_MANT_DIG == 113) && LDBL_MAX_EXP == 16384 |
9 | 8 |
10 static const long double toint = 1/LDBL_EPSILON; | 9 static const long double toint = 1 / LDBL_EPSILON; |
11 | 10 |
12 long double roundl(long double x) | 11 long double roundl(long double x) { |
13 { | 12 union ldshape u = {x}; |
14 » union ldshape u = {x}; | 13 int e = u.i.se & 0x7fff; |
15 » int e = u.i.se & 0x7fff; | 14 long double y; |
16 » long double y; | |
17 | 15 |
18 » if (e >= 0x3fff+LDBL_MANT_DIG-1) | 16 if (e >= 0x3fff + LDBL_MANT_DIG - 1) |
19 » » return x; | 17 return x; |
20 » if (u.i.se >> 15) | 18 if (u.i.se >> 15) |
21 » » x = -x; | 19 x = -x; |
22 » if (e < 0x3fff-1) { | 20 if (e < 0x3fff - 1) { |
23 » » FORCE_EVAL(x + toint); | 21 FORCE_EVAL(x + toint); |
24 » » return 0*u.f; | 22 return 0 * u.f; |
25 » } | 23 } |
26 » y = x + toint - toint - x; | 24 y = x + toint - toint - x; |
27 » if (y > 0.5) | 25 if (y > 0.5) |
28 » » y = y + x - 1; | 26 y = y + x - 1; |
29 » else if (y <= -0.5) | 27 else if (y <= -0.5) |
30 » » y = y + x + 1; | 28 y = y + x + 1; |
31 » else | 29 else |
32 » » y = y + x; | 30 y = y + x; |
33 » if (u.i.se >> 15) | 31 if (u.i.se >> 15) |
34 » » y = -y; | 32 y = -y; |
35 » return y; | 33 return y; |
36 } | 34 } |
37 #endif | 35 #endif |
OLD | NEW |