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Improve memory usage of V3Partition. Only performance change intended.

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This commit is contained in:
Wilson Snyder 2021-11-03 22:01:27 -04:00
parent c1d7bfa617
commit da5644211f
1 changed files with 10 additions and 5 deletions
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15
src/V3Partition.cpp
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@ -705,8 +705,11 @@ public:
// Information associated with scoreboarding an MTask
class MergeCandidate VL_NOT_FINAL {
private:
bool m_removedFromSb = false; // Not on scoreboard, generally ignore
vluint64_t m_id; // Serial number for ordering
// This structure is extremely hot. To save 8 bytes we pack
// one bit indicating removedFromSb with the id.
vluint64_t m_id; // <63> removed, <62:0> Serial number for ordering
static constexpr vluint64_t REMOVED_MASK = 1ULL << 63;
public:
// CONSTRUCTORS
MergeCandidate() {
@ -717,9 +720,11 @@ public:
virtual ~MergeCandidate() = default;
virtual bool mergeWouldCreateCycle() const = 0;
// METHODS
bool removedFromSb() const { return m_removedFromSb; }
void removedFromSb(bool removed) { m_removedFromSb = removed; }
bool operator<(const MergeCandidate& other) const { return m_id < other.m_id; }
bool removedFromSb() const { return (m_id & REMOVED_MASK) != 0; }
void removedFromSb(bool removed) { m_id |= REMOVED_MASK; }
bool operator<(const MergeCandidate& other) const {
return (m_id & ~REMOVED_MASK) < (other.m_id & ~REMOVED_MASK);
}
};
// A pair of associated LogicMTask's that are merge candidates for sibling