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-rw-r--r--math/s_casinhf.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/math/s_casinhf.c b/math/s_casinhf.c
index 37c67401a3..c7098ef309 100644
--- a/math/s_casinhf.c
+++ b/math/s_casinhf.c
@@ -1,5 +1,5 @@
/* Return arc hyperbole sine for float 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 @@ __casinhf (__complex__ float x)
__imag__ y += __imag__ x;
res = __clogf (y);
+
+ /* Ensure zeros have correct sign and results are correct if
+ very close to branch cuts. */
+ __real__ res = __copysignf (__real__ res, __real__ x);
+ __imag__ res = __copysignf (__imag__ res, __imag__ x);
}
return res;