Last change
on this file since 388 was 388, checked in by coas-nagasima, 5 years ago |
Azure IoT Hub Device C SDK を使ったサンプルの追加
|
-
Property svn:eol-style
set to
native
-
Property svn:keywords
set to
Id
-
Property svn:mime-type
set to
text/x-csrc
|
File size:
726 bytes
|
Rev | Line | |
---|
[388] | 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.