X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=lib%2Fsqrtl.c;h=bf1b2d5faa74594c771578fa6bd692e619b1ff07;hb=471815b5cfb17e9a6b4ea985cc18edb87e26f30f;hp=e8e2b32fbd7f34c97e95d3d41f0549755b11f9c6;hpb=d0723a1652f9f002aa800cd618fd52717b980b18;p=gnulib.git

diff --git a/lib/sqrtl.c b/lib/sqrtl.c
index e8e2b32fb..bf1b2d5fa 100644
--- a/lib/sqrtl.c
+++ b/lib/sqrtl.c
@@ -1,7 +1,7 @@
 /* Emulation for sqrtl.
    Contributed by Paolo Bonzini
 
-   Copyright 2002, 2003 Free Software Foundation, Inc.
+   Copyright 2002, 2003, 2007 Free Software Foundation, Inc.
 
    This file is part of gnulib.
 
@@ -17,12 +17,15 @@
 
    You should have received a copy of the GNU General Public License along
    with this program; if not, write to the Free Software Foundation,
-   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
 
-#include <float.h>
+#include <config.h>
+
+/* Specification.  */
 #include <math.h>
 
-#include "mathl.h"
+#include <float.h>
+#include "isnanl.h"
 
 /* A simple Newton-Raphson method. */
 long double
@@ -31,12 +34,16 @@ sqrtl(long double x)
   long double delta, y;
   int exponent;
 
+  /* Check for NaN */
+  if (isnanl (x))
+    return x;
+
   /* Check for negative numbers */
   if (x < 0.0L)
     return (long double) sqrt(-1);
 
-  /* Check for zero, NANs and infinites */
-  if (x + x == x || x != x)
+  /* Check for zero and infinites */
+  if (x + x == x)
     return x;
 
   frexpl (x, &exponent);