Initial import of libdpf.

Co-authored-by: Cursor <cursoragent@cursor.com>

include/grotto/gadget_hints.hpp

@@ -0,0 +1,69 @@
+/// @file grotto/gadget_hints.hpp
+/// @author Ryan Henry <ryan.henry@ucalgary.ca>
+/// @brief
+/// @details
+/// @copyright Copyright (c) 2019-2023 Ryan Henry and others
+/// @license Released under a GNU General Public v2.0 (GPLv2) license;
+///          see [LICENSE.md](@ref GPLv2) for details.
+
+
+#ifndef LIBDPF_INCLUDE_GROTTO_GADGET_HINTS_HPP__
+#define LIBDPF_INCLUDE_GROTTO_GADGET_HINTS_HPP__
+
+#include <cmath>
+#include <array>
+#include <limits>
+
+namespace grotto
+{
+
+namespace gadgets
+{
+
+template <typename T>
+struct gadget_hints
+{
+    static constexpr double min = std::numeric_limits<double>::min();
+    static constexpr double max = std::numeric_limits<double>::max();
+    static constexpr unsigned degree = 3;
+    static constexpr double * poles = nullptr;
+    static constexpr double * interesting_points = nullptr;
+    static constexpr bool has_canonical_representation = false;
+    static constexpr double * canonical_bounds = nullptr;
+    static constexpr std::array<double, degree+1> * canonical_polys = nullptr;
+};
+
+constexpr double ulp_of(double x)
+{
+    return std::max(
+            std::abs(std::nexttoward(x, std::numeric_limits<double>::infinity())-x),
+            std::abs(std::nexttoward(x, x-std::numeric_limits<double>::infinity())));
+}
+
+template <typename T, std::size_t N>
+struct gadget_domain
+{
+    static constexpr T min()
+    {
+        
+        double fmin = std::max(gadget_hints<T>::min,
+            -std::exp2(std::numeric_limits<T>::bits-N));
+        T tmin = static_cast<T>(fmin);
+        if (static_cast<double>(tmin) < fmin) tmin += std::exp2(-N);
+        return tmin;
+    }
+    static constexpr T max()
+    {
+        double fmax = std::max(gadget_hints<T>::max,
+            std::exp2(std::numeric_limits<T>::bits-N) - std::exp2(-N));
+        T tmax = static_cast<T>(fmax);
+        if (static_cast<double>(tmax) > fmax) tmax -= std::exp2(-N);
+        return tmax;
+    }
+};
+
+}  // namespace gadgets
+
+}  // namespace grotto
+
+#endif  // LIBDPF_INCLUDE_GROTTO_GADGET_HINTS_HPP__