X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=lib%2Fsqrtl.c;h=299e70db6046c7bdc33852f4463c81d29d63e2e2;hb=6951841b81058b0dd883fcdeb2be31d6aa8b8658;hp=3702f027effe58fd2f349f88ee2dee1405e80723;hpb=e1123c2f4fedae90435426a82a05cf2e3233e97d;p=pspp

diff --git a/lib/sqrtl.c b/lib/sqrtl.c
index 3702f027ef..299e70db60 100644
--- a/lib/sqrtl.c
+++ b/lib/sqrtl.c
@@ -1,23 +1,22 @@
 /* Emulation for sqrtl.
    Contributed by Paolo Bonzini
 
-   Copyright 2002, 2003, 2007 Free Software Foundation, Inc.
+   Copyright 2002-2003, 2007, 2009-2011 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>
 
@@ -28,17 +27,21 @@
 
 /* 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);