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| author | Joseph Myers <joseph@codesourcery.com> | 2012-03-07 15:15:19 +0000 |
|---|---|---|
| committer | Joseph Myers <joseph@codesourcery.com> | 2012-03-07 15:15:19 +0000 |
| commit | d1d3431a3a9dd14501eedb701436bd5005b1db7d (patch) | |
| tree | 39d3514fc227717e59ebd11e94c822491a8b382d /math/s_cacoshl.c | |
| parent | a4300c7a4d65e24a4a0215460c063ea9c7b4605a (diff) | |
| download | glibc-d1d3431a3a9dd14501eedb701436bd5005b1db7d.zip glibc-d1d3431a3a9dd14501eedb701436bd5005b1db7d.tar.gz glibc-d1d3431a3a9dd14501eedb701436bd5005b1db7d.tar.bz2 | |
Fix signs of zeros from casinh, cacosh etc. (bug 10716).
Diffstat (limited to 'math/s_cacoshl.c')
| -rw-r--r-- | math/s_cacoshl.c | 14 |
1 files changed, 9 insertions, 5 deletions
diff --git a/math/s_cacoshl.c b/math/s_cacoshl.c index dcdb1d5..3bcab1d 100644 --- a/math/s_cacoshl.c +++ b/math/s_cacoshl.c @@ -1,5 +1,5 @@ /* Return arc hyperbole cosine for long double value. - Copyright (C) 1997, 1998, 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 @@ __cacoshl (__complex__ long double x) } /* The factor 16 is just a guess. */ else if (16.0L * fabsl (__imag__ x) < fabsl (__real__ x)) - /* Kahan's formula which avoid cancellation through subtraction in - some cases. */ - res = 2.0L * __clogl (__csqrtl ((x + 1.0L) / 2.0L) - + __csqrtl ((x - 1.0L) / 2.0L)); + { + /* Kahan's formula which avoid cancellation through subtraction in + some cases. */ + res = 2.0L * __clogl (__csqrtl ((x + 1.0L) / 2.0L) + + __csqrtl ((x - 1.0L) / 2.0L)); + if (signbit (__real__ res)) + __real__ res = 0.0L; + } else { __complex__ long double y; |