set default newlib dir's structure

git-svn-id: svn://kolibrios.org@4874 a494cfbc-eb01-0410-851d-a64ba20cac60

contrib/sdk/sources/newlib/libc/math/s_signbit.c

@@ -0,0 +1,59 @@
+/* Copyright (C) 2002 by  Red Hat, Incorporated. All rights reserved.
+ *
+ * Permission to use, copy, modify, and distribute this software
+ * is freely granted, provided that this notice is preserved.
+ */
+/*
+FUNCTION
+<<signbit>>--Does floating-point number have negative sign?
+
+INDEX
+	signbit
+
+ANSI_SYNOPSIS
+	#include <math.h>
+	int signbit(real-floating <[x]>);
+
+DESCRIPTION
+The <<signbit>> macro determines whether the sign of its argument value is
+negative.  The macro reports the sign of all values, including infinities,
+zeros, and NaNs.  If zero is unsigned, it is treated as positive.  As shown in
+the synopsis, the argument is "real-floating," meaning that any of the real
+floating-point types (float, double, etc.) may be given to it.
+
+Note that because of the possibilities of signed 0 and NaNs, the expression
+"<[x]> < 0.0" does not give the same result as <<signbit>> in all cases.
+
+RETURNS
+The <<signbit>> macro returns a nonzero value if and only if the sign of its
+argument value is negative.
+
+PORTABILITY
+C99, POSIX.
+
+*/
+
+#include "fdlibm.h"
+
+int __signbitf (float x);
+int __signbitd (double x);
+
+int
+__signbitf (float x)
+{
+  unsigned int w;
+
+  GET_FLOAT_WORD(w,x);
+
+  return (w & 0x80000000);
+}
+
+int
+__signbitd (double x)
+{
+  unsigned int msw;
+
+  GET_HIGH_WORD(msw, x);
+
+  return (msw & 0x80000000);
+}