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Have DenseMap auto-shrink itself on clear(). This improves the time to optimize

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403.gcc from 15.2s to 14.3s.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40100 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson 2007-07-20 16:15:24 +00:00
parent e2abf12436
commit 6ad5fde5d0
1 changed files with 36 additions and 1 deletions
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37
include/llvm/ADT/DenseMap.h
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@ -90,6 +90,11 @@ public:
unsigned size() const { return NumEntries; }
void clear() {
if (NumEntries * 4 < NumBuckets && NumBuckets > 64) {
shrink_and_clear();
return;
}
const KeyT EmptyKey = getEmptyKey(), TombstoneKey = getTombstoneKey();
for (BucketT *P = Buckets, *E = Buckets+NumBuckets; P != E; ++P) {
if (P->first != EmptyKey && P->first != TombstoneKey) {
@ -101,7 +106,7 @@ public:
assert(NumEntries == 0 && "Node count imbalance!");
NumTombstones = 0;
}
/// count - Return true if the specified key is in the map.
bool count(const KeyT &Val) const {
BucketT *TheBucket;
@ -290,6 +295,36 @@ private:
// Free the old table.
delete[] (char*)OldBuckets;
}
void shrink_and_clear() {
unsigned OldNumBuckets = NumBuckets;
BucketT *OldBuckets = Buckets;
// Halve the number of buckets.
NumBuckets >>= 1;
NumTombstones = 0;
Buckets = (BucketT*)new char[sizeof(BucketT)*NumBuckets];
// Initialize all the keys to EmptyKey.
const KeyT EmptyKey = getEmptyKey();
for (unsigned i = 0, e = NumBuckets; i != e; ++i)
new (&Buckets[i].first) KeyT(EmptyKey);
// Free the old buckets.
const KeyT TombstoneKey = getTombstoneKey();
for (BucketT *B = OldBuckets, *E = OldBuckets+OldNumBuckets; B != E; ++B) {
if (B->first != EmptyKey && B->first != TombstoneKey) {
// Free the value.
B->second.~ValueT();
}
B->first.~KeyT();
}
// Free the old table.
delete[] (char*)OldBuckets;
NumEntries = 0;
}
};
template<typename KeyT, typename ValueT, typename KeyInfoT>