Commit fca2bd43 authored by Philipp Götze's avatar Philipp Götze
Browse files

Added custom Bitmap for individual handling of underlying words

parent fb6ffc73
......@@ -86,7 +86,7 @@ static void BM_TreeErase(benchmark::State &state) {
pop.drain();
const auto pos = treeRef.lookupPositionInLeafNode(leaf, KEYPOS);
// const auto pos = dbis::BitOperations::getFreeZero(leaf->bits.get_ro());
// const auto pos = leaf->bits.get_ro().getFreeZero();
#ifdef ENABLE_PCM
SocketCounterState before_sstate;
......
......@@ -93,7 +93,7 @@ static void BM_TreeInsert(benchmark::State &state) {
const auto reqTup = MyTuple(KEYPOS, KEYPOS * 100, KEYPOS * 1.0);
const auto pos = treeRef.lookupPositionInLeafNode(leaf, KEYPOS);
//const auto pos = dbis::BitOperations::getFreeZero(leaf->bits.get_ro());
// const auto pos = leaf->bits.get_ro().getFreeZero();
#ifdef ENABLE_PCM
SocketCounterState before_sstate;
......
......@@ -18,10 +18,10 @@
#ifndef DBIS_BitHPBPTree_hpp_
#define DBIS_BitHPBPTree_hpp_
#include <libpmemobj/ctl.h>
#include <array>
#include <iostream>
#include <libpmemobj/ctl.h>
#include <libpmemobj++/make_persistent.hpp>
#include <libpmemobj++/p.hpp>
#include <libpmemobj++/persistent_ptr.hpp>
......@@ -29,7 +29,9 @@
#include <libpmemobj++/utils.hpp>
#include "config.h"
#include "utils/BitOperations.hpp"
#include "utils/Bitmap.hpp"
#include <bitset>
#include "utils/PersistEmulation.hpp"
#include "utils/SearchFunctions.hpp"
......@@ -41,18 +43,18 @@ using pmem::obj::make_persistent;
using pmem::obj::p;
using pmem::obj::persistent_ptr;
using pmem::obj::transaction;
template<typename Object>
template <typename Object>
using pptr = persistent_ptr<Object>;
/**
* A persistent memory implementation of a B+ tree.
*
* @tparam KeyType the data type of the key
* @tparam ValueType the data type of the values associated with the key
* @tparam N the maximum number of keys on a branch node
* @tparam M the maximum number of keys on a leaf node
*/
template<typename KeyType, typename ValueType, size_t N, size_t M>
* A persistent memory implementation of a B+ tree.
*
* @tparam KeyType the data type of the key
* @tparam ValueType the data type of the values associated with the key
* @tparam N the maximum number of keys on a branch node
* @tparam M the maximum number of keys on a leaf node
*/
template <typename KeyType, typename ValueType, size_t N, size_t M>
class BitHPBPTree {
/// we need at least two keys on a branch node to be able to split
static_assert(N > 2, "number of branch keys has to be >2.");
......@@ -62,9 +64,9 @@ class BitHPBPTree {
static_assert(M > 0, "number of leaf keys should be >0.");
#ifndef UNIT_TESTS
private:
private:
#else
public:
public:
#endif
/// Forward declarations
......@@ -72,36 +74,43 @@ class BitHPBPTree {
struct BranchNode;
struct Node {
Node() : tag(BLANK) {};
Node() : tag(BLANK){};
explicit Node(const pptr<LeafNode> &leaf_) : tag(LEAF), leaf(leaf_) {};
explicit Node(const BranchNode *branch_) : tag(BRANCH), branch(branch_) {};
explicit Node(const pptr<LeafNode> &leaf_) : tag(LEAF), leaf(leaf_){};
explicit Node(const BranchNode *branch_) : tag(BRANCH), branch(branch_){};
Node(const Node &other) { copy(other); };
void copy(const Node &other) {
tag = other.tag;
switch (tag) {
case LEAF: {
leaf = other.leaf; break;
leaf = other.leaf;
break;
}
case BRANCH: {
branch = other.branch; break;
branch = other.branch;
break;
}
default:;
}
}
Node &operator=(const Node &other) { copy(other); return *this; }
Node &operator=(const Node &other) {
copy(other);
return *this;
}
Node &operator=(const pptr<LeafNode> &leaf_) {
tag = LEAF; leaf = leaf_; return *this;
tag = LEAF;
leaf = leaf_;
return *this;
}
Node &operator=(BranchNode *const branch_) {
tag = BRANCH; branch = branch_; return *this;
tag = BRANCH;
branch = branch_;
return *this;
}
enum NodeType {
BLANK, LEAF, BRANCH
} tag;
enum NodeType { BLANK, LEAF, BRANCH } tag;
union {
pptr<LeafNode> leaf;
......@@ -115,7 +124,6 @@ class BitHPBPTree {
* A structure for representing a leaf node of a B+ tree.
*/
struct alignas(64) LeafNode {
static constexpr auto NUM_KEYS = M;
using KEY_TYPE = KeyType;
......@@ -127,7 +135,7 @@ class BitHPBPTree {
static constexpr auto BitsetSize = ((M + 63) / 64) * 8; ///< number * size of words
static constexpr auto PaddingSize = (64 - (BitsetSize + 32) % 64) % 64;
p<std::bitset<M>> bits; ///< bitset for valid entries
p<dbis::Bitmap<M>> bits; ///< bitmap for valid entries
pptr<LeafNode> nextLeaf; ///< pointer to the subsequent sibling
pptr<LeafNode> prevLeaf; ///< pointer to the preceeding sibling
char padding[PaddingSize]; ///< padding to align keys to 64 bytes
......@@ -140,18 +148,17 @@ class BitHPBPTree {
* The rightmost child is always at position N.
*/
struct alignas(64) BranchNode {
static constexpr auto NUM_KEYS = N;
using KEY_TYPE = KeyType;
/**
* Constructor for creating a new empty branch node.
*/
BranchNode(){}
BranchNode() {}
std::bitset<N> bits; ///< bitset for valid entries
std::array<KeyType, N> keys; ///< the actual keys
std::array<Node, N + 1> children; ///< pointers to child nodes (BranchNode or LeafNode)
dbis::Bitmap<N> bits; ///< bitmap for valid entries
std::array<KeyType, N> keys; ///< the actual keys
std::array<Node, N + 1> children; ///< pointers to child nodes (BranchNode or LeafNode)
};
/**
......@@ -187,13 +194,9 @@ class BitHPBPTree {
/**
* Create a new empty branch node.
*/
BranchNode *newBranchNode() {
return new BranchNode();
}
BranchNode *newBranchNode() { return new BranchNode(); }
BranchNode *newBranchNode(const BranchNode *other) {
return new BranchNode(*other);
}
BranchNode *newBranchNode(const BranchNode *other) { return new BranchNode(*other); }
/**
* Remove/delete an existing branch node.
......@@ -209,9 +212,9 @@ class BitHPBPTree {
* A structure for passing information about a node split to the caller.
*/
struct SplitInfo {
KeyType key; ///< the key at which the node was split
Node leftChild; ///< the resulting lhs child node
Node rightChild; ///< the resulting rhs child node
KeyType key; ///< the key at which the node was split
Node leftChild; ///< the resulting lhs child node
Node rightChild; ///< the resulting rhs child node
};
static constexpr pobj_alloc_class_desc AllocClass{256, 64, 1, POBJ_HEADER_COMPACT};
......@@ -231,7 +234,7 @@ class BitHPBPTree {
pptr<LeafNode> currentNode;
size_t currentPosition;
public:
public:
iterator() : currentNode(nullptr), currentPosition(0) {}
iterator(const Node &root, size_t d) {
......@@ -241,16 +244,16 @@ class BitHPBPTree {
currentNode = node.leaf;
currentPosition = 0;
const auto &nodeBits = currentNode->bits.get_ro();
while(!nodeBits.test(currentPosition)) ++currentPosition;
while (!nodeBits.test(currentPosition)) ++currentPosition;
}
iterator &operator++() {
if (currentPosition >= M-1) {
if (currentPosition >= M - 1) {
currentNode = currentNode->nextLeaf;
currentPosition = 0;
if (currentNode == nullptr) return *this;
const auto &nodeBits = currentNode->bits.get_ro();
while(!nodeBits.test(currentPosition)) ++currentPosition;
while (!nodeBits.test(currentPosition)) ++currentPosition;
} else {
if (!currentNode->bits.get_ro().test(++currentPosition)) ++(*this);
}
......@@ -287,7 +290,6 @@ class BitHPBPTree {
iterator end() { return iterator(); }
/**
* Alias for a function passed to the scan method.
*/
......@@ -297,7 +299,7 @@ class BitHPBPTree {
* Constructor for creating a new B+ tree.
*/
explicit BitHPBPTree(struct pobj_alloc_class_desc _alloc) : depth(0), alloc_class(_alloc) {
// BitHPBPTree() : depth(0) {
// BitHPBPTree() : depth(0) {
rootNode = newLeafNode();
leafList = rootNode.leaf;
LOG("created new tree with sizeof(BranchNode) = "
......@@ -389,10 +391,10 @@ class BitHPBPTree {
void recover() {
LOG("Starting RECOVERY of BitHPBPTree");
pptr<LeafNode> currentLeaf = leafList;
if(leafList == nullptr){
if (leafList == nullptr) {
LOG("No data to recover HPBPTree");
}
if(leafList->nextLeaf == nullptr){
if (leafList->nextLeaf == nullptr) {
/// The index has only one node, so the leaf node becomes the root node
rootNode = leafList;
depth = 0;
......@@ -413,11 +415,12 @@ class BitHPBPTree {
* Print the structure and content of the B+ tree to stdout.
*/
void print() const {
if (depth == 0) printLeafNode(0u, rootNode.leaf);
else printBranchNode(0u, rootNode.branch);
if (depth == 0)
printLeafNode(0u, rootNode.leaf);
else
printBranchNode(0u, rootNode.branch);
}
/**
* Perform a scan over all key-value pairs stored in the B+ tree.
* For each entry the given function @func is called.
......@@ -471,7 +474,10 @@ class BitHPBPTree {
const auto &key = leafKeys[i];
if (key < minKey) continue;
if (key > maxKey) { higherThanMax = true; continue; };
if (key > maxKey) {
higherThanMax = true;
continue;
};
const auto &val = leafValues[i];
func(key, val);
......@@ -529,62 +535,65 @@ class BitHPBPTree {
* @param pos the position of the child node @leaf in the @c children array of the branch node
* @param leaf the node at which the underflow occured
*/
void underflowAtLeafLevel(BranchNode * const node, const unsigned int pos, pptr<LeafNode> &leaf) {
assert(pos <= N);
auto &nodeRef = *node;
auto &leafRef = *leaf;
auto prevNumKeys = 0u;
constexpr auto middle = (M + 1) / 2;
void underflowAtLeafLevel(BranchNode *const node, const unsigned int pos, pptr<LeafNode> &leaf) {
assert(pos <= N);
auto &nodeRef = *node;
auto &leafRef = *leaf;
auto prevNumKeys = 0u;
constexpr auto middle = (M + 1) / 2;
/// 1. we check whether we can rebalance with one of the siblings but only if both nodes have
/// the same direct parent
if (pos > 0 && (prevNumKeys = leafRef.prevLeaf->bits.get_ro().count()) > middle) {
/// we have a sibling at the left for rebalancing the keys
balanceLeafNodes(leafRef.prevLeaf, leaf);
const auto newMin = leafRef.keys.get_ro()[findMinKeyPos(leafRef.keys.get_ro(),
leafRef.bits.get_ro())];
const auto prevPos = findMinKeyPosGreaterThan(leafRef.keys.get_ro(), leafRef.bits.get_ro(),
newMin);
nodeRef.keys[prevPos] = newMin;
} else if (pos < N && leafRef.nextLeaf->bits.get_ro().count() > middle) {
/// we have a sibling at the right for rebalancing the keys
balanceLeafNodes(leafRef.nextLeaf, leaf);
const auto &nextLeaf = *leafRef.nextLeaf;
nodeRef.keys[pos] =
/// 1. we check whether we can rebalance with one of the siblings but only if both nodes have
/// the same direct parent
if (pos > 0 && (prevNumKeys = leafRef.prevLeaf->bits.get_ro().count()) > middle) {
/// we have a sibling at the left for rebalancing the keys
balanceLeafNodes(leafRef.prevLeaf, leaf);
const auto newMin =
leafRef.keys.get_ro()[findMinKeyPos(leafRef.keys.get_ro(), leafRef.bits.get_ro())];
const auto prevPos =
findMinKeyPosGreaterThan(leafRef.keys.get_ro(), leafRef.bits.get_ro(), newMin);
nodeRef.keys[prevPos] = newMin;
} else if (pos < N && leafRef.nextLeaf->bits.get_ro().count() > middle) {
/// we have a sibling at the right for rebalancing the keys
balanceLeafNodes(leafRef.nextLeaf, leaf);
const auto &nextLeaf = *leafRef.nextLeaf;
nodeRef.keys[pos] =
nextLeaf.keys.get_ro()[findMinKeyPos(nextLeaf.keys.get_ro(), nextLeaf.bits.get_ro())];
} else {
/// 2. if this fails we have to merge two leaf nodes but only if both nodes have the same
/// direct parent
pptr<LeafNode> survivor = nullptr;
if (findMinKeyPos(nodeRef.keys, nodeRef.bits) != pos && prevNumKeys <= middle) {
/// merge left
survivor = mergeLeafNodes(leafRef.prevLeaf, leaf);
deleteLeafNode(leaf);
/// move to next left slot
const auto prevPos = (pos == N) ?
findMaxKeyPos(nodeRef.keys, nodeRef.bits) : ///< we need a new rightmost node
findMaxKeyPosSmallerThan(nodeRef.keys, nodeRef.bits, nodeRef.keys[pos]);
nodeRef.children[pos] = nodeRef.children[prevPos];
nodeRef.bits.reset(prevPos);
} else if (pos < N && leafRef.nextLeaf->bits.get_ro().count() <= middle) {
/// merge right
survivor = mergeLeafNodes(leaf, leafRef.nextLeaf);
deleteLeafNode(leafRef.nextLeaf);
/// move to next right slot
const auto nextPos = findMinKeyPosGreaterThan(nodeRef.keys, nodeRef.bits, nodeRef.keys[pos]);
nodeRef.children[nextPos] = nodeRef.children[pos];
nodeRef.bits.reset(pos);
} else assert(false); ///< this shouldn't happen?!
if (nodeRef.bits.count() == 0) {
/// This is a special case that happens only if the current node is the root node. Now, we
/// have to replace the branch root node by a leaf node.
rootNode = survivor;
--depth;
}
} else {
/// 2. if this fails we have to merge two leaf nodes but only if both nodes have the same
/// direct parent
pptr<LeafNode> survivor = nullptr;
if (findMinKeyPos(nodeRef.keys, nodeRef.bits) != pos && prevNumKeys <= middle) {
/// merge left
survivor = mergeLeafNodes(leafRef.prevLeaf, leaf);
deleteLeafNode(leaf);
/// move to next left slot
const auto prevPos =
(pos == N) ? findMaxKeyPos(nodeRef.keys, nodeRef.bits)
: ///< we need a new rightmost node
findMaxKeyPosSmallerThan(nodeRef.keys, nodeRef.bits, nodeRef.keys[pos]);
nodeRef.children[pos] = nodeRef.children[prevPos];
nodeRef.bits.reset(prevPos);
} else if (pos < N && leafRef.nextLeaf->bits.get_ro().count() <= middle) {
/// merge right
survivor = mergeLeafNodes(leaf, leafRef.nextLeaf);
deleteLeafNode(leafRef.nextLeaf);
/// move to next right slot
const auto nextPos =
findMinKeyPosGreaterThan(nodeRef.keys, nodeRef.bits, nodeRef.keys[pos]);
nodeRef.children[nextPos] = nodeRef.children[pos];
nodeRef.bits.reset(pos);
} else
assert(false); ///< this shouldn't happen?!
if (nodeRef.bits.count() == 0) {
/// This is a special case that happens only if the current node is the root node. Now, we
/// have to replace the branch root node by a leaf node.
rootNode = survivor;
--depth;
}
}
}
/**
* Merge two leaf nodes by moving all elements from @c node2 to @c node1.
......@@ -593,7 +602,7 @@ class BitHPBPTree {
* @param node2 the source node
* @return the merged node (always @c node1)
*/
pptr<LeafNode> mergeLeafNodes(const pptr<LeafNode> &node1, const pptr<LeafNode> &node2) {
pptr<LeafNode> mergeLeafNodes(const pptr<LeafNode> &node1, const pptr<LeafNode> &node2) {
assert(node1 != nullptr);
assert(node2 != nullptr);
auto &node1Ref = *node1;
......@@ -609,7 +618,7 @@ class BitHPBPTree {
const auto &node2Values = node2Ref.values.get_ro();
for (auto i = 0u; i < M; ++i) {
if (node2Bits.test(i)) {
const auto u = BitOperations::getFreeZero(node1Bits);
const auto u = node1Bits.getFreeZero();
node1Keys[u] = node2Keys[i];
node1Values[u] = node2Values[i];
node1Bits.set(u);
......@@ -650,7 +659,7 @@ class BitHPBPTree {
/// move from one node to a node with larger keys
for (auto i = 0u; i < toMove; ++i) {
const auto max = findMaxKeyPos(donorKeys, donorBits);
const auto u = BitOperations::getFreeZero(receiverBits);
const auto u = receiverBits.getFreeZero();
/// move the donor's maximum key to the receiver
receiverKeys[u] = donorKeys[max];
receiverValues[u] = donorValues[max];
......@@ -661,7 +670,7 @@ class BitHPBPTree {
/// move from one node to a node with smaller keys
for (auto i = 0u; i < toMove; ++i) {
const auto min = findMinKeyPos(donorKeys, donorBits);
const auto u = BitOperations::getFreeZero(receiverBits);
const auto u = receiverBits.getFreeZero();
/// move the donor's minimum key to the receiver
receiverKeys[u] = donorKeys[min];
receiverValues[u] = donorValues[min];
......@@ -683,7 +692,7 @@ class BitHPBPTree {
* @param key the key to be deleted
* @return true if the entry was deleted
*/
bool eraseFromBranchNode(BranchNode * const node, const unsigned int d, const KeyType &key) {
bool eraseFromBranchNode(BranchNode *const node, const unsigned int d, const KeyType &key) {
assert(d >= 1);
auto &nodeRef = *node;
bool deleted = false;
......@@ -728,13 +737,14 @@ class BitHPBPTree {
* @param child the node at which the underflow occured
* @return the (possibly new) child node (in case of a merge)
*/
BranchNode *underflowAtBranchLevel(BranchNode * const node, const unsigned int pos,
BranchNode * child) {
BranchNode *underflowAtBranchLevel(BranchNode *const node, const unsigned int pos,
BranchNode *child) {
assert(node != nullptr);
assert(child != nullptr);
auto &nodeRef = *node;
const auto nMinKeyPos = findMinKeyPos(nodeRef.keys, nodeRef.bits);
const auto prevPos = findMaxKeyPosSmallerThan(nodeRef.keys, nodeRef.bits, nodeRef.keys[pos]); //could be N
const auto prevPos =
findMaxKeyPosSmallerThan(nodeRef.keys, nodeRef.bits, nodeRef.keys[pos]); // could be N
const auto prevNumKeys = nodeRef.children[prevPos].branch->bits.count();
const auto nextPos = findMinKeyPosGreaterThan(nodeRef.keys, nodeRef.bits, nodeRef.keys[pos]);
const auto nextNumKeys = nodeRef.children[nextPos].branch->bits.count();
......@@ -760,8 +770,7 @@ class BitHPBPTree {
mergeBranchNodes(lSibling, nodeRef.keys[pos], child);
deleteBranchNode(child);
nodeRef.bits.reset(pos);
if (pos == N)
nodeRef.children[N] = child; ///< new rightmost child
if (pos == N) nodeRef.children[N] = child; ///< new rightmost child
return lSibling;
} else if (pos < N && nextNumKeys <= middle) {
/// merge from right
......@@ -770,10 +779,10 @@ class BitHPBPTree {
deleteBranchNode(rSibling);
nodeRef.bits.reset(pos);
if (pos == findMaxKeyPos(nodeRef.keys, nodeRef.bits))
nodeRef.children[N] = child; ///< new rightmost child
nodeRef.children[N] = child; ///< new rightmost child
return child;
} else {
assert(false); ///< shouldn't happen
assert(false); ///< shouldn't happen
return child;
}
}
......@@ -786,7 +795,7 @@ class BitHPBPTree {
* @param key the key from the parent node that is between sibling and node
* @param node the node from which we move all keys/children
*/
void mergeBranchNodes(BranchNode * const sibling, const KeyType &key, const BranchNode * node) {
void mergeBranchNodes(BranchNode *const sibling, const KeyType &key, const BranchNode *node) {
assert(sibling != nullptr);
assert(node != nullptr);
......@@ -796,13 +805,13 @@ class BitHPBPTree {
assert(key <= nodeRef.keys[findMinKeyPos(nodeRef.keys, nodeRef.bits)]);
assert(sibRef.keys[findMaxKeyPos(sibRef.keys, sibRef.bits)] < key);
auto u = BitOperations::getFreeZero(sibRef.bits);
auto u = sibRef.bits.getFreeZero();
sibRef.keys[u] = key;
sibRef.children[u] = sibRef.children[N];
sibRef.bits.set(u);
for (auto i = 0u; i < M; ++i) {
if (nodeRef.bits.test(i)) {
u = BitOperations::getFreeZero(sibRef.bits);
u = sibRef.bits.getFreeZero();
sibRef.keys[u] = nodeRef.keys[i];
sibRef.children[u] = nodeRef.children[i];
sibRef.bits.set(u);
......@@ -821,8 +830,8 @@ class BitHPBPTree {
* @param parent the parent node of @c donor and @c receiver
* @param pos the position of the key in node @c parent that lies between @c donor and @c receiver
*/
void balanceBranchNodes(BranchNode * const donor, BranchNode * const receiver,
BranchNode * const parent, const unsigned int pos) {
void balanceBranchNodes(BranchNode *const donor, BranchNode *const receiver,
BranchNode *const parent, const unsigned int pos) {
auto &donorRef = *donor;
auto &receiverRef = *receiver;
auto &parentRef = *parent;
......@@ -835,17 +844,17 @@ class BitHPBPTree {
if (toMove == 0) return;
/// 1. move from one node to a node with larger keys
if (donorRef.keys[BitOperations::getFirstSet(donorRef.bits)] <
receiverRef.keys[BitOperations::getFirstSet(receiverRef.bits)]) {
if (donorRef.keys[donorRef.bits.getFirstSet()] <
receiverRef.keys[receiverRef.bits.getFirstSet()]) {
/// 1.1. copy parent key and rightmost child from donor
auto u = BitOperations::getFreeZero(receiverRef.bits);
auto u = receiverRef.bits.getFreeZero();
receiverRef.keys[u] = parentRef.keys[pos];
receiverRef.children[u] = donorRef.children[N];
receiverRef.bits.set(u);
/// 1.2. move toMove-1 keys/children from donor to receiver
for (auto i = 1u; i < toMove; ++i) {
const auto max = findMaxKeyPos(donorRef.keys, donorRef.bits);
u = BitOperations::getFreeZero(receiverRef.bits);
u = receiverRef.bits.getFreeZero();
receiverRef.keys[u] = donorRef.keys[max];
receiverRef.children[u] = donorRef.children[max];
receiverRef.bits.set(u);
......@@ -857,16 +866,16 @@ class BitHPBPTree {
parentRef.keys[pos] = donorRef.keys[dPos];
donorRef.bits.reset(dPos);
/// 2. move from one node to a node with smaller keys
/// 2. move from one node to a node with smaller keys
} else {
/// 2.1. copy parent key and rightmost child of receiver
auto u = BitOperations::getFreeZero(receiverRef.bits);
auto u = receiverRef.bits.getFreeZero();
receiverRef.keys[u] = parentRef.keys[pos];
receiverRef.children[u] = receiverRef.children[N];
receiverRef.bits.set(u);
/// 2.2. move toMove-1 keys/children from donor to receiver
for (auto i = 1u; i < toMove; ++i) {
u = BitOperations::getFreeZero(receiverRef.bits);
u = receiverRef.bits.getFreeZero();
const auto min = findMinKeyPos(donorRef.keys, donorRef.bits);
receiverRef.keys[u] = donorRef.keys[min];
receiverRef.children[u] = donorRef.children[min];
......@@ -905,7 +914,7 @@ class BitHPBPTree {
nodeRef.values.get_rw()[pos] = val;
return false;
}
const auto u = BitOperations::getFreeZero(nodeRef.bits.get_ro());
const auto u = nodeRef.bits.get_ro().getFreeZero();
if (u == M) {
/// split the node
splitLeafNode(node, splitInfo);
......@@ -915,14 +924,15 @@ class BitHPBPTree {
/// insert the new entry
if (key > splitRef.key) {
insertInLeafNodeAtPosition(sibling, BitOperations::getFreeZero(sibRef.bits.get_ro()), key, val);
insertInLeafNodeAtPosition(sibling, sibRef.bits.get_ro().getFreeZero(), key, val);
} else {
if (key > nodeRef.keys.get_ro()[findMaxKeyPos(nodeRef.keys.get_ro(), nodeRef.bits.get_ro())]) {
if (key >
nodeRef.keys.get_ro()[findMaxKeyPos(nodeRef.keys.get_ro(), nodeRef.bits.get_ro())]) {
/// Special case: new key would be the middle, thus must be right
insertInLeafNodeAtPosition(sibling, BitOperations::getFreeZero(sibRef.bits.get_ro()), key, val);
insertInLeafNodeAtPosition(sibling, sibRef.bits.get_ro().getFreeZero(), key, val);
splitRef.key = key;
} else {
insertInLeafNodeAtPosition(node, BitOperations::getFreeZero(nodeRef.bits.get_ro()), key, val);
insertInLeafNodeAtPosition(node, nodeRef.bits.get_ro().getFreeZero(), key, val);
}
}
/// inform the caller about the split
......@@ -953,7 +963,7 @@ class BitHPBPTree {
auto &sibRef = *sibling;
nodeRef.bits.get_rw() = b;
sibRef.bits.get_rw() = b.flip();
PersistEmulation::writeBytes<sizeof(LeafNode) + ((2*M+7)>>3)>();
PersistEmulation::writeBytes<sizeof(LeafNode) + ((2 * M + 7) >> 3)>();
/// Alternative: move instead of complete copy