Ryan Henry
0d22946a0e
Ship the TLS mesh, composer, Beaver/Yao/leaf MPC, prep/online paths, apps, and docs so the tree is pushable before elevating share_expr, security_mode, and prep resume. Co-authored-by: Cursor <cursoragent@cursor.com>
65 lines
2.2 KiB
C++
65 lines
2.2 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 license) 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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HEDLEY_DIAGNOSTIC_PUSH
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HEDLEY_DIAGNOSTIC_DISABLE_DEPRECATED
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/// @brief Cleartext `countl_zero`.
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/// @see grotto::exact_constant
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/// @note Straight-line cleartext. Fixed-point evaluation is the symbol in `@see` when that symbol is a LUT or an `eval_*` function.
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/// \complexity One evaluation of `operator()` as written in this header. There is no domain scan and no loop. `Θ(1)` time and extra space relative to that expression.
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struct HEDLEY_DEPRECATED_FOR(2026, grotto::exact_constant) countl_zero
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{
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/// @brief Evaluate the cleartext map.
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/// @tparam T argument and result type
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/// @param x the input
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/// @return the cleartext image of `x`
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/// \complexity The body is straight-line. `Θ(1)` time and extra space.
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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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HEDLEY_DIAGNOSTIC_POP
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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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