NEWS.stable: log cherry-pick [e446f25]->[c092018] relocatable-shell: Update suggested...

[gnulib.git] / lib / sqrtl.c

diff --git a/lib/sqrtl.c b/lib/sqrtl.c
index ed914a2..4f7c9f1 100644 (file)
--- a/lib/sqrtl.c
+++ b/lib/sqrtl.c
@@ -1,44 +1,57 @@
 /* Emulation for sqrtl.
    Contributed by Paolo Bonzini
 
-   Copyright 2002, 2003 Free Software Foundation, Inc.
+   Copyright 2002-2003, 2007, 2009-2014 Free Software Foundation, Inc.
 
    This file is part of gnulib.
 
-   gnulib is free software; you can redistribute it and/or modify it
-   under the terms of the GNU Lesser General Public License as published
-   by the Free Software Foundation; either version 2.1, or (at your option)
-   any later version.
+   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 3 of the License, or
+   (at your option) any later version.
 
-   gnulib 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 Lesser General Public
-   License for more details.
+   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 Lesser General Public License
-   along with gnulib; see the file COPYING.LIB.  If not, write to the Free
-   Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
-   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 <float.h>
+#include <config.h>
+
+/* Specification.  */
 #include <math.h>
 
-#include "mathl.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