X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;ds=sidebyside;f=lib%2Fsqrtl.c;h=61e9574d1a8c20ccc2d4773a72e5b9513c1e9f31;hb=a828bb24ee96386201c4236ea917677b6c536c7d;hp=3702f027effe58fd2f349f88ee2dee1405e80723;hpb=e1123c2f4fedae90435426a82a05cf2e3233e97d;p=gnulib.git

diff --git a/lib/sqrtl.c b/lib/sqrtl.c
index 3702f027e..61e9574d1 100644
--- a/lib/sqrtl.c
+++ b/lib/sqrtl.c
@@ -1,44 +1,57 @@
 /* Emulation for sqrtl.
    Contributed by Paolo Bonzini
 
-   Copyright 2002, 2003, 2007 Free Software Foundation, Inc.
+   Copyright 2002-2003, 2007, 2009-2013 Free Software Foundation, Inc.
 
    This file is part of gnulib.
 
-   This program is free software; you can redistribute it and/or modify
+   This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
 
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
 
-   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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
 #include <config.h>
 
 /* Specification.  */
 #include <math.h>
 
-#include <float.h>
+#if HAVE_SAME_LONG_DOUBLE_AS_DOUBLE
+
+long double
+sqrtl (long double x)
+{
+  return sqrt (x);
+}
+
+#else
+
+# include <float.h>
 
 /* A simple Newton-Raphson method. */
 long double
-sqrtl(long double x)
+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);
+    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);
@@ -54,3 +67,5 @@ sqrtl(long double x)
 
   return y;
 }
+
+#endif