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03b06257d3
byuu says: This synchronizes bsnes/higan with many recent internal nall changes. This will be the last WIP until I am situated in Japan. Apologies for the bugfixes that didn't get applied yet, I ran out of time.
29 lines
723 B
C++
29 lines
723 B
C++
#pragma once
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namespace nall {
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template<uint Bits> struct BarrettReduction {
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using type = typename ArithmeticNatural<1 * Bits>::type;
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using pair = typename ArithmeticNatural<2 * Bits>::type;
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explicit BarrettReduction(type modulo) : modulo(modulo), factor(pair(1) + -pair(modulo) / modulo) {}
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//return => value % modulo
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inline auto operator()(pair value) const -> type {
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pair hi, lo;
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mul(value, factor, hi, lo);
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pair remainder = value - hi * modulo;
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return remainder < modulo ? remainder : remainder - modulo;
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}
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private:
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const pair modulo;
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const pair factor;
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};
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template<typename T, uint Bits> auto operator%(T value, const BarrettReduction<Bits>& modulo) {
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return modulo(value);
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}
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}
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