From d1d3431a3a9dd14501eedb701436bd5005b1db7d Mon Sep 17 00:00:00 2001 From: Joseph Myers Date: Wed, 7 Mar 2012 15:15:19 +0000 Subject: Fix signs of zeros from casinh, cacosh etc. (bug 10716). --- math/s_casinhl.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) (limited to 'math/s_casinhl.c') diff --git a/math/s_casinhl.c b/math/s_casinhl.c index de41cb8..80d7bf5 100644 --- a/math/s_casinhl.c +++ b/math/s_casinhl.c @@ -1,5 +1,5 @@ /* Return arc hyperbole sine for long double value. - Copyright (C) 1997, 1998, 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 , 1997. @@ -73,6 +73,11 @@ __casinhl (__complex__ long double x) __imag__ y += __imag__ x; res = __clogl (y); + + /* Ensure zeros have correct sign and results are correct if + very close to branch cuts. */ + __real__ res = __copysignl (__real__ res, __real__ x); + __imag__ res = __copysignl (__imag__ res, __imag__ x); } return res; -- cgit v1.1