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do not let the table fill up with tombstones.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@33973 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2007-02-07 01:11:25 +00:00
parent 04a3115e61
commit e237cf934f
2 changed files with 7 additions and 1 deletions
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2
include/llvm/ADT/SmallPtrSet.h
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@ -51,6 +51,7 @@ protected:
// If small, this is # elts allocated consequtively // If small, this is # elts allocated consequtively
unsigned NumElements; unsigned NumElements;
unsigned NumTombstones;
void *SmallArray[1]; // Must be last ivar. void *SmallArray[1]; // Must be last ivar.
public: public:
SmallPtrSetImpl(unsigned SmallSize) { SmallPtrSetImpl(unsigned SmallSize) {
@ -82,6 +83,7 @@ public:
// Fill the array with empty markers. // Fill the array with empty markers.
memset(CurArray, -1, CurArraySize*sizeof(void*)); memset(CurArray, -1, CurArraySize*sizeof(void*));
NumElements = 0; NumElements = 0;
NumTombstones = 0;
} }
/// insert - This returns true if the pointer was new to the set, false if it /// insert - This returns true if the pointer was new to the set, false if it

6
lib/Support/SmallPtrSet.cpp
View File

@ -32,7 +32,8 @@ bool SmallPtrSetImpl::insert(void *Ptr) {
} }
// If more than 3/4 of the array is full, grow. // If more than 3/4 of the array is full, grow.
if (NumElements*4 >= CurArraySize*3) if (NumElements*4 >= CurArraySize*3 ||
CurArraySize-(NumElements+NumTombstones) < CurArraySize/8)
Grow(); Grow();
// Okay, we know we have space. Find a hash bucket. // Okay, we know we have space. Find a hash bucket.
@ -40,6 +41,8 @@ bool SmallPtrSetImpl::insert(void *Ptr) {
if (*Bucket == Ptr) return false; // Already inserted, good. if (*Bucket == Ptr) return false; // Already inserted, good.
// Otherwise, insert it! // Otherwise, insert it!
if (*Bucket == getTombstoneMarker())
--NumTombstones;
*Bucket = Ptr; *Bucket = Ptr;
++NumElements; // Track density. ++NumElements; // Track density.
return true; return true;
@ -69,6 +72,7 @@ bool SmallPtrSetImpl::erase(void *Ptr) {
// Set this as a tombstone. // Set this as a tombstone.
*Bucket = getTombstoneMarker(); *Bucket = getTombstoneMarker();
--NumElements; --NumElements;
++NumTombstones;
return true; return true;
} }