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32 lines
936 B
C++
32 lines
936 B
C++
//
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// Carry.hpp
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// Clock Signal
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//
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// Created by Thomas Harte on 30/08/2023.
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// Copyright © 2023 Thomas Harte. All rights reserved.
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//
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#ifndef Carry_hpp
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#define Carry_hpp
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namespace Numeric {
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/// @returns @c true if there was carry out of @c bit when @c source1 and @c source2 were added, producing @c result.
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template <int bit, typename IntT> bool carried_out(IntT source1, IntT source2, IntT result) {
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// 0 and 0 => didn't.
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// 0 and 1 or 1 and 0 => did if 0.
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// 1 and 1 => did.
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return IntT(1 << bit) & (source1 | source2) & ((source1 & source2) | ~result);
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}
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/// @returns @c true if there was carry into @c bit when @c source1 and @c source2 were added, producing @c result.
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template <int bit, typename IntT> bool carried_in(IntT source1, IntT source2, IntT result) {
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// 0 and 0 or 1 and 1 => did if 1
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// 0 and 1 or 1 and 0 => did if 0
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return IntT(1 << bit) & (source1 ^ source2 ^ result);
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}
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}
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#endif /* Carry_hpp */
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