comparison DEPENDENCIES/generic/include/boost/numeric/interval/detail/ppc_rounding_control.hpp @ 16:2665513ce2d3

Add boost headers

+/* Boost interval/detail/ppc_rounding_control.hpp file
+ *
+ * Copyright 2000 Jens Maurer
+ * Copyright 2002 Hervé Brönnimann, Guillaume Melquiond, Sylvain Pion
+ * Copyright 2005 Guillaume Melquiond
+ *
+ * Distributed under the Boost Software License, Version 1.0.
+ * (See accompanying file LICENSE_1_0.txt or
+ * copy at http://www.boost.org/LICENSE_1_0.txt)
+ */
+
+#ifndef BOOST_NUMERIC_INTERVAL_DETAIL_PPC_ROUNDING_CONTROL_HPP
+#define BOOST_NUMERIC_INTERVAL_DETAIL_PPC_ROUNDING_CONTROL_HPP
+
+#if !defined(powerpc) && !defined(__powerpc__) && !defined(__ppc__)
+#error This header only works on PPC CPUs.
+#endif
+
+#if defined(__GNUC__ ) || (__IBMCPP__ >= 700)
+
+namespace boost {
+namespace numeric {
+namespace interval_lib {
+namespace detail {
+
+typedef union {
+   ::boost::long_long_type imode;
+  double dmode;
+} rounding_mode_struct;
+
+static const rounding_mode_struct mode_upward      = { 0xFFF8000000000002LL };
+static const rounding_mode_struct mode_downward    = { 0xFFF8000000000003LL };
+static const rounding_mode_struct mode_to_nearest  = { 0xFFF8000000000000LL };
+static const rounding_mode_struct mode_toward_zero = { 0xFFF8000000000001LL };
+
+struct ppc_rounding_control
+{
+  typedef double rounding_mode;
+
+  static void set_rounding_mode(const rounding_mode mode)
+  { __asm__ __volatile__ ("mtfsf 255,%0" : : "f"(mode)); }
+
+  static void get_rounding_mode(rounding_mode& mode)
+  { __asm__ __volatile__ ("mffs %0" : "=f"(mode)); }
+
+  static void downward()    { set_rounding_mode(mode_downward.dmode);    }
+  static void upward()      { set_rounding_mode(mode_upward.dmode);      }
+  static void to_nearest()  { set_rounding_mode(mode_to_nearest.dmode);  }
+  static void toward_zero() { set_rounding_mode(mode_toward_zero.dmode); }
+};
+
+} // namespace detail
+
+// Do not declare the following C99 symbols if <math.h> provides them.
+// Otherwise, conflicts may occur, due to differences between prototypes.
+#if !defined(_ISOC99_SOURCE) && !defined(__USE_ISOC99)
+extern "C" {
+  float rintf(float);
+  double rint(double);
+}
+#endif
+
+template<>
+struct rounding_control<float>:
+  detail::ppc_rounding_control
+{
+  static float force_rounding(const float r)
+  {
+    float tmp;
+    __asm__ __volatile__ ("frsp %0, %1" : "=f" (tmp) : "f" (r));
+    return tmp;
+  }
+  static float to_int(const float& x) { return rintf(x); }
+};
+
+template<>
+struct rounding_control<double>:
+  detail::ppc_rounding_control
+{
+  static const double & force_rounding(const double& r) { return r; }
+  static double to_int(const double& r) { return rint(r); }
+};
+
+template<>
+struct rounding_control<long double>:
+  detail::ppc_rounding_control
+{
+  static const long double & force_rounding(const long double& r) { return r; }
+  static long double to_int(const long double& r) { return rint(r); }
+};
+
+} // namespace interval_lib
+} // namespace numeric
+} // namespace boost
+
+#undef BOOST_NUMERIC_INTERVAL_NO_HARDWARE
+#endif
+
+#endif /* BOOST_NUMERIC_INTERVAL_DETAIL_PPC_ROUNDING_CONTROL_HPP */