Last change
on this file since 351 was 337, checked in by coas-nagasima, 6 years ago |
ASP3版ECNLを追加
|
-
Property svn:eol-style
set to
native
-
Property svn:mime-type
set to
text/x-csrc;charset=UTF-8
|
File size:
536 bytes
|
Line | |
---|
1 | #include "libm.h"
|
---|
2 |
|
---|
3 | double modf(double x, double *iptr)
|
---|
4 | {
|
---|
5 | union {double f; uint64_t i;} u = {x};
|
---|
6 | uint64_t mask;
|
---|
7 | int e = (int)(u.i>>52 & 0x7ff) - 0x3ff;
|
---|
8 |
|
---|
9 | /* no fractional part */
|
---|
10 | if (e >= 52) {
|
---|
11 | *iptr = x;
|
---|
12 | if (e == 0x400 && u.i<<12 != 0) /* nan */
|
---|
13 | return x;
|
---|
14 | u.i &= 1ULL<<63;
|
---|
15 | return u.f;
|
---|
16 | }
|
---|
17 |
|
---|
18 | /* no integral part*/
|
---|
19 | if (e < 0) {
|
---|
20 | u.i &= 1ULL<<63;
|
---|
21 | *iptr = u.f;
|
---|
22 | return x;
|
---|
23 | }
|
---|
24 |
|
---|
25 | mask = -1ULL>>12>>e;
|
---|
26 | if ((u.i & mask) == 0) {
|
---|
27 | *iptr = x;
|
---|
28 | u.i &= 1ULL<<63;
|
---|
29 | return u.f;
|
---|
30 | }
|
---|
31 | u.i &= ~mask;
|
---|
32 | *iptr = u.f;
|
---|
33 | return x - u.f;
|
---|
34 | }
|
---|
Note:
See
TracBrowser
for help on using the repository browser.