Added boost header

test/external/boost/numeric/interval/detail/alpha_rounding_control.hpp

@@ -0,0 +1,113 @@
+/* Boost interval/detail/alpha_rounding_control.hpp file
+ *
+ * Copyright 2005 Felix H<>fling, 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_ALPHA_ROUNDING_CONTROL_HPP
+#define BOOST_NUMERIC_INTERVAL_DETAIL_ALPHA_ROUNDING_CONTROL_HPP
+
+#if !defined(alpha) && !defined(__alpha__)
+#error This header only works on Alpha CPUs.
+#endif
+
+#if defined(__GNUC__) || defined(__digital__) || defined(__DECCXX)
+
+#include <float.h> // write_rnd() and read_rnd()
+
+namespace boost {
+namespace numeric {
+namespace interval_lib {
+
+namespace detail {
+#if defined(__GNUC__ )
+    typedef union {
+    ::boost::long_long_type imode;
+    double dmode;
+    } rounding_mode_struct;
+
+    // set bits 59-58 (DYN),
+    // clear all exception bits and disable overflow (51) and inexact exceptions (62)
+    static const rounding_mode_struct mode_upward      = { 0x4C08000000000000LL };
+    static const rounding_mode_struct mode_downward    = { 0x4408000000000000LL };
+    static const rounding_mode_struct mode_to_nearest  = { 0x4808000000000000LL };
+    static const rounding_mode_struct mode_toward_zero = { 0x4008000000000000LL };
+
+    struct alpha_rounding_control
+    {
+    typedef double rounding_mode;
+
+    static void set_rounding_mode(const rounding_mode mode)
+    { __asm__ __volatile__ ("mt_fpcr %0" : : "f"(mode)); }
+
+    static void get_rounding_mode(rounding_mode& mode)
+    { __asm__ __volatile__ ("mf_fpcr %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); }
+    };
+#elif defined(__digital__) || defined(__DECCXX)
+
+#if defined(__DECCXX) && !(defined(__FLT_ROUNDS) && __FLT_ROUNDS == -1)
+#error Dynamic rounding mode not enabled. See cxx man page for details.
+#endif
+
+    struct alpha_rounding_control
+    {
+    typedef unsigned int rounding_mode;
+
+    static void set_rounding_mode(const rounding_mode& mode)  { write_rnd(mode); }
+    static void get_rounding_mode(rounding_mode& mode)  { mode = read_rnd(); }
+
+    static void downward()    { set_rounding_mode(FP_RND_RM); }
+    static void upward()      { set_rounding_mode(FP_RND_RP); }
+    static void to_nearest()  { set_rounding_mode(FP_RND_RN); }
+    static void toward_zero() { set_rounding_mode(FP_RND_RZ); }
+    };
+#endif
+} // namespace detail
+
+extern "C" {
+  float rintf(float);
+  double rint(double);
+  long double rintl(long double);
+}
+
+template<>
+struct rounding_control<float>:
+  detail::alpha_rounding_control
+{
+  static float force_rounding(const float r)
+  { volatile float _r = r; return _r; }
+  static float to_int(const float& x) { return rintf(x); }
+};
+
+template<>
+struct rounding_control<double>:
+  detail::alpha_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::alpha_rounding_control
+{
+  static const long double & force_rounding(const long double& r) { return r; }
+  static long double to_int(const long double& r) { return rintl(r); }
+};
+
+} // namespace interval_lib
+} // namespace numeric
+} // namespace boost
+
+#undef BOOST_NUMERIC_INTERVAL_NO_HARDWARE
+#endif
+
+#endif /* BOOST_NUMERIC_INTERVAL_DETAIL_ALPHA_ROUNDING_CONTROL_HPP */