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Deepen BitPattern and BitHistory to 64 bits.

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This commit is contained in:
Jared Boone 2015-11-16 10:33:08 -08:00
parent 4d6877ab15
commit 9900c29283
1 changed files with 7 additions and 7 deletions
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14
firmware/common/bit_pattern.hpp
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@ -31,12 +31,12 @@ public:
history = (history << 1) | (bit & 1); history = (history << 1) | (bit & 1);
} }
uint32_t value() const { uint64_t value() const {
return history; return history;
} }
private: private:
uint32_t history { 0 }; uint64_t history { 0 };
}; };
class BitPattern { class BitPattern {
@ -49,24 +49,24 @@ public:
} }
constexpr BitPattern( constexpr BitPattern(
const uint32_t code, const uint64_t code,
const size_t code_length, const size_t code_length,
const size_t maximum_hanning_distance = 0 const size_t maximum_hanning_distance = 0
) : code_ { code }, ) : code_ { code },
mask_ { (1U << code_length) - 1U }, mask_ { (1ULL << code_length) - 1ULL },
maximum_hanning_distance_ { maximum_hanning_distance } maximum_hanning_distance_ { maximum_hanning_distance }
{ {
} }
bool operator()(const BitHistory& history, const size_t) const { bool operator()(const BitHistory& history, const size_t) const {
const auto delta_bits = (history.value() ^ code_) & mask_; const auto delta_bits = (history.value() ^ code_) & mask_;
const size_t count = __builtin_popcountl(delta_bits); const size_t count = __builtin_popcountll(delta_bits);
return (count <= maximum_hanning_distance_); return (count <= maximum_hanning_distance_);
} }
private: private:
uint32_t code_; uint64_t code_;
uint32_t mask_; uint64_t mask_;
size_t maximum_hanning_distance_; size_t maximum_hanning_distance_;
}; };