diff options
Diffstat (limited to 'math/s_casinh.c')
| -rw-r--r-- | math/s_casinh.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/math/s_casinh.c b/math/s_casinh.c index e06be1cdc6..24ae676a8f 100644 --- a/math/s_casinh.c +++ b/math/s_casinh.c @@ -1,5 +1,5 @@ /* Return arc hyperbole sine for double value. - Copyright (C) 1997, 2011 Free Software Foundation, Inc. + Copyright (C) 1997-2012 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. @@ -73,6 +73,11 @@ __casinh (__complex__ double x) __imag__ y += __imag__ x; res = __clog (y); + + /* Ensure zeros have correct sign and results are correct if + very close to branch cuts. */ + __real__ res = __copysign (__real__ res, __real__ x); + __imag__ res = __copysign (__imag__ res, __imag__ x); } return res; |