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Make the heuristic for shrinking DenseMap smarter.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40114 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson 2007-07-20 18:56:46 +00:00
parent edbef38067
commit 398b40671b
1 changed files with 4 additions and 2 deletions
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6
include/llvm/ADT/DenseMap.h
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@ -15,6 +15,7 @@
#define LLVM_ADT_DENSEMAP_H #define LLVM_ADT_DENSEMAP_H
#include "llvm/Support/DataTypes.h" #include "llvm/Support/DataTypes.h"
#include "llvm/Support/MathExtras.h"
#include <cassert> #include <cassert>
#include <utility> #include <utility>
@ -300,8 +301,9 @@ private:
unsigned OldNumBuckets = NumBuckets; unsigned OldNumBuckets = NumBuckets;
BucketT *OldBuckets = Buckets; BucketT *OldBuckets = Buckets;
// Halve the number of buckets. // Reduce the number of buckets.
NumBuckets >>= 1; NumBuckets = NumEntries > 32 ? 1 << (Log2_32_Ceil(NumEntries) + 1)
: 64;
NumTombstones = 0; NumTombstones = 0;
Buckets = (BucketT*)new char[sizeof(BucketT)*NumBuckets]; Buckets = (BucketT*)new char[sizeof(BucketT)*NumBuckets];