Add the missing file

From-SVN: r193771

libquadmath/quadmath-rounding-mode.h

+/* GCC Quad-Precision Math Library
+   Copyright (C) 2012 Free Software Foundation, Inc.
+
+This file is part of the libquadmath library.
+Libquadmath is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public
+License as published by the Free Software Foundation; either
+version 2 of the License, or (at your option) any later version.
+
+Libquadmath 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
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with libquadmath; see the file COPYING.LIB.  If
+not, write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
+Boston, MA 02110-1301, USA.  */
+
+
+#ifndef QUADMATH_ROUNDING_MODE_H
+#define QUADMATH_ROUNDING_MODE_H
+
+#include <stdbool.h>
+
+
+#if defined(HAVE_FENV_H)
+#  include <fenv.h>
+#endif /* HAVE_FENV_H */
+
+static inline int
+get_rounding_mode (void)
+{
+#if defined(HAVE_FENV_H) && (defined(FE_DOWNWARD) || defined(FE_TONEAREST) \
+			     || defined(FE_TOWARDZERO) || defined(FE_UPWARD))
+  return fegetround (void);
+#else
+  return 0;
+#endif
+}
+
+static inline bool
+round_away (bool negative, bool last_digit_odd, bool half_bit, bool more_bits,
+            int mode)
+{
+  switch (mode)
+    {
+#ifdef FE_DOWNWARD
+    case FE_DOWNWARD:
+      return negative && (half_bit || more_bits);
+#endif
+
+#ifdef FE_DOWNWARD
+    case FE_TONEAREST:
+      return half_bit && (last_digit_odd || more_bits);
+#endif
+
+#ifdef FE_TOWARDZERO
+    case FE_TOWARDZERO:
+      return false;
+#endif
+
+
+#ifdef FE_UPWARD
+    case FE_UPWARD:
+      return !negative && (half_bit || more_bits);
+#endif
+
+    default:
+      return false;
+    }
+}
+
+#endif /* QUADMATH_ROUNDING_MODE_H  */