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Fix signs of zeros from casinh, cacosh etc. (bug 10716).

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This commit is contained in:
Joseph Myers
2012-03-07 15:15:19 +00:00
parent a4300c7a4d
commit d1d3431a3a
11 changed files with 750 additions and 21 deletions
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12
math/s_cacosh.c
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@ -1,5 +1,5 @@
/* Return arc hyperbole cosine for double 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.
@ -66,9 +66,13 @@ __cacosh (__complex__ double x)
}
/* The factor 16 is just a guess. */
else if (16.0 * fabs (__imag__ x) < fabs (__real__ x))
/* Kahan's formula which avoid cancellation through subtraction in
some cases. */
res = 2.0 * __clog (__csqrt ((x + 1.0) / 2.0) + __csqrt ((x - 1.0) / 2.0));
{
/* Kahan's formula which avoid cancellation through subtraction in
some cases. */
res = 2.0 * __clog (__csqrt ((x + 1.0) / 2.0) + __csqrt ((x - 1.0) / 2.0));
if (signbit (__real__ res))
__real__ res = 0.0;
}
else
{
__complex__ double y;