Last change
on this file since 403 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:
726 bytes
|
Line | |
---|
1 | #include "libm.h"
|
---|
2 |
|
---|
3 | #if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
|
---|
4 | long double acoshl(long double x)
|
---|
5 | {
|
---|
6 | return acosh(x);
|
---|
7 | }
|
---|
8 | #elif LDBL_MANT_DIG == 64 && LDBL_MAX_EXP == 16384
|
---|
9 | /* acosh(x) = log(x + sqrt(x*x-1)) */
|
---|
10 | long double acoshl(long double x)
|
---|
11 | {
|
---|
12 | union ldshape u = {x};
|
---|
13 | int e = u.i.se & 0x7fff;
|
---|
14 |
|
---|
15 | if (e < 0x3fff + 1)
|
---|
16 | /* |x| < 2, invalid if x < 1 or nan */
|
---|
17 | return log1pl(x-1 + sqrtl((x-1)*(x-1)+2*(x-1)));
|
---|
18 | if (e < 0x3fff + 32)
|
---|
19 | /* |x| < 0x1p32 */
|
---|
20 | return logl(2*x - 1/(x+sqrtl(x*x-1)));
|
---|
21 | return logl(x) + 0.693147180559945309417232121458176568L;
|
---|
22 | }
|
---|
23 | #elif LDBL_MANT_DIG == 113 && LDBL_MAX_EXP == 16384
|
---|
24 | // TODO: broken implementation to make things compile
|
---|
25 | long double acoshl(long double x)
|
---|
26 | {
|
---|
27 | return acosh(x);
|
---|
28 | }
|
---|
29 | #endif
|
---|
Note:
See
TracBrowser
for help on using the repository browser.