48 lines
1.4 KiB
C++
48 lines
1.4 KiB
C++
/* This file is part of the dynarmic project.
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* Copyright (c) 2018 MerryMage
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* This software may be used and distributed according to the terms of the GNU
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* General Public License version 2 or any later version.
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*/
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#pragma once
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#include <utility>
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#include "common/common_types.h"
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namespace Dynarmic::Common {
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/**
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* This function is a workaround for a bug in MSVC 19.12 where fold expressions
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* do not work when the /permissive- flag is enabled.
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*/
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template<typename T, typename... Ts>
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constexpr T Sum(T first, Ts&&... rest) {
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if constexpr (sizeof...(rest) == 0) {
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return first;
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} else {
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return first + Sum(std::forward<Ts>(rest)...);
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}
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}
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/**
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* Input is a u0.9 fixed point number. Only values in [0.5, 1.0) are valid.
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* Output is a u0.8 fixed point number, with an implied 1 prefixed.
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* i.e.: The output is a value in [1.0, 2.0).
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*
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* @see RecipEstimate() within the ARMv8 architecture reference manual
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* for a general overview of the requirements of the algorithm.
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*/
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u8 RecipEstimate(u64 a);
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/**
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* Input is a u0.9 fixed point number. Only values in [0.25, 1.0) are valid.
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* Output is a u0.8 fixed point number, with an implied 1 prefixed.
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* i.e.: The output is a value in [1.0, 2.0).
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*
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* @see RecipSqrtEstimate() within the ARMv8 architecture reference manual
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* for a general overview of the requirements of the algorithm.
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*/
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u8 RecipSqrtEstimate(u64 a);
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} // namespace Dynarmic::Common
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