Import of the watch repository from Pebble

third_party/jerryscript/jerry-libm/isnan.c

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+/* Copyright 2016 Samsung Electronics Co., Ltd.
+ * Copyright 2016 University of Szeged
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * This file is based on work under the following copyright and permission
+ * notice:
+ *
+ *     Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
+ *
+ *     Developed at SunSoft, a Sun Microsystems, Inc. business.
+ *     Permission to use, copy, modify, and distribute this
+ *     software is freely granted, provided that this notice
+ *     is preserved.
+ *
+ *     @(#)s_isnan.c 1.3 95/01/18
+ */
+
+#include "jerry-libm-internal.h"
+
+/* isnan(x) returns 1 is x is nan, else 0;
+ * no branching!
+ */
+
+int
+isnan (double x)
+{
+  int hx, lx;
+
+  hx = (__HI (x) & 0x7fffffff);
+  lx = __LO (x);
+  hx |= (unsigned) (lx | (-lx)) >> 31;
+  hx = 0x7ff00000 - hx;
+  return ((unsigned) (hx)) >> 31;
+} /* isnan */