diff options
Diffstat (limited to 'math/s_cacoshf.c')
| -rw-r--r-- | math/s_cacoshf.c | 14 |
1 files changed, 9 insertions, 5 deletions
diff --git a/math/s_cacoshf.c b/math/s_cacoshf.c index d634a1b..fc716ac 100644 --- a/math/s_cacoshf.c +++ b/math/s_cacoshf.c @@ -1,5 +1,5 @@ /* Return arc hyperbole cosine for float value. - Copyright (C) 1997, 2006, 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. @@ -66,10 +66,14 @@ __cacoshf (__complex__ float x) } /* The factor 16 is just a guess. */ else if (16.0 * fabsf (__imag__ x) < fabsf (__real__ x)) - /* Kahan's formula which avoid cancellation through subtraction in - some cases. */ - res = 2.0 * __clogf (__csqrtf ((x + 1.0) / 2.0) - + __csqrtf ((x - 1.0) / 2.0)); + { + /* Kahan's formula which avoid cancellation through subtraction in + some cases. */ + res = 2.0 * __clogf (__csqrtf ((x + 1.0) / 2.0) + + __csqrtf ((x - 1.0) / 2.0)); + if (signbit (__real__ res)) + __real__ res = 0.0f; + } else { __complex__ float y; |