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authorJoseph Myers <joseph@codesourcery.com>2012-03-07 15:15:19 +0000
committerJoseph Myers <joseph@codesourcery.com>2012-03-07 15:15:19 +0000
commitd1d3431a3a9dd14501eedb701436bd5005b1db7d (patch)
tree39d3514fc227717e59ebd11e94c822491a8b382d /math/s_casinh.c
parenta4300c7a4d65e24a4a0215460c063ea9c7b4605a (diff)
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Fix signs of zeros from casinh, cacosh etc. (bug 10716).
Diffstat (limited to 'math/s_casinh.c')
-rw-r--r--math/s_casinh.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/math/s_casinh.c b/math/s_casinh.c
index e06be1cdc6..24ae676a8f 100644
--- a/math/s_casinh.c
+++ b/math/s_casinh.c
@@ -1,5 +1,5 @@
 /* Return arc hyperbole sine for double 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 @@ __casinh (__complex__ double x)
       __imag__ y += __imag__ x;
 
       res = __clog (y);
+
+      /* Ensure zeros have correct sign and results are correct if
+	 very close to branch cuts.  */
+      __real__ res = __copysign (__real__ res, __real__ x);
+      __imag__ res = __copysign (__imag__ res, __imag__ x);
     }
 
   return res;