50 lines
1.5 KiB
C++
50 lines
1.5 KiB
C++
/// @file grotto/gadgets/binary/countl_zero.hpp
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/// @author Ryan Henry <ryan.henry@ucalgary.ca>
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/// @brief gadgetized form of `std::countl_zero`
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/// @copyright Copyright (c) 2019-2023 Ryan Henry and others
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/// @license Released under a GNU General Public v2.0 (GPLv2) license;
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/// see [LICENSE.md](@ref GPLv2) for details.
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#ifndef LIBDPF_INCLUDE_GROTTO_GADGETS_BINARY_COUNTL_ZERO_HPP__
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#define LIBDPF_INCLUDE_GROTTO_GADGETS_BINARY_COUNTL_ZERO_HPP__
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#include <array>
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#include <limits>
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#include <portable-snippets/builtin/builtin.h>
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#include "grotto/gadget_hints.hpp"
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namespace grotto
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{
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namespace gadgets
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{
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struct countl_zero
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{
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template <typename T>
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T operator()(T x)
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{
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if (x == 0) return std::numeric_limits<T>::bits();
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return psnip_builtin_clz64(static_cast<uint64_t>(static_cast<double>(x)));
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}
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};
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template <>
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struct gadget_hints<countl_zero>
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{
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static constexpr double min = std::numeric_limits<double>::min();
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static constexpr double max = std::numeric_limits<double>::max();
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static constexpr double poles[] = { };
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static constexpr double interesting_points[] = { 0 };
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static constexpr unsigned degree = 0;
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static constexpr bool has_canonical_representation = false;
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static constexpr double canonical_bounds[] = { };
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static constexpr std::array<double, degree+1> hint_canonical_polys[] = { };
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};
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} // namespace gadgets
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} // namespace grotto
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#endif // LIBDPF_INCLUDE_GROTTO_GADGETS_BINARY_COUNTL_ZERO_HPP__
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