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minor cleanup/fastpath for the bcreader. This speeds up the bcreader

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from 1:41 -> 1:39 on the large python .bc file in a release build.

llvm-svn: 23623
This commit is contained in:
Chris Lattner 2005-10-04 16:52:46 +00:00
parent 9a2a3d4aab
commit 6627e8e4b5
1 changed files with 23 additions and 2 deletions
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25
lib/VMCore/Constants.cpp
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@ -520,6 +520,9 @@ namespace {
typedef std::map<MapKey, ConstantClass *> MapTy;
typedef typename MapTy::iterator MapIterator;
private:
/// Map - This is the main map from the element descriptor to the Constants.
/// This is the primary way we avoid creating two of the same shape
/// constant.
MapTy Map;
typedef std::map<const TypeClass*, MapIterator> AbstractTypeMapTy;
@ -548,6 +551,24 @@ namespace {
Exists = !IP.second;
return IP.first;
}
/// SimpleRemove - This method removes the specified constant from the map,
/// without updating type information. This should only be used when we're
/// changing an element in the map, making this the second half of a 'move'
/// operation.
void SimpleRemove(ConstantClass *CP) {
MapIterator I = Map.find(MapKey((TypeClass*)CP->getRawType(),
getValType(CP)));
if (I == Map.end() || I->second != CP) {
// FIXME: This should not use a linear scan. If this gets to be a
// performance problem, someone should look at this.
for (I = Map.begin(); I != Map.end() && I->second != CP; ++I)
/* empty */;
}
assert(I != Map.end() && "Constant not found in constant table!");
assert(I->second == CP && "Didn't find correct element?");
Map.erase(I);
}
/// getOrCreate - Return the specified constant from the map, creating it if
/// necessary.
@ -1383,7 +1404,7 @@ void ConstantArray::replaceUsesOfWithOnConstant(Value *From, Value *To,
// in place!
if (I != ArrayConstants.map_end() && I->second == this)
++I; // Do not invalidate iterator!
ArrayConstants.remove(this); // Remove old shape from the map.
ArrayConstants.SimpleRemove(this); // Remove old shape from the map.
// Update to the new values.
for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
@ -1445,7 +1466,7 @@ void ConstantStruct::replaceUsesOfWithOnConstant(Value *From, Value *To,
// in place!
if (I != StructConstants.map_end() && I->second == this)
++I; // Do not invalidate iterator!
StructConstants.remove(this); // Remove old shape from the map.
StructConstants.SimpleRemove(this); // Remove old shape from the map.
// Update to the new values.
for (unsigned i = 0, e = getNumOperands(); i != e; ++i)