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Keep a cache of non-abstract null arrays and structs. This speeds up llvm-dis 

from 16.57 -> 13.46s on 129.compress.

llvm-svn: 11462
This commit is contained in:
Chris Lattner 2004-02-15 02:46:46 +00:00
parent 0836c10052
commit 5d56c478ba
1 changed files with 19 additions and 2 deletions
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21
llvm/lib/VMCore/Constants.cpp
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@ -64,6 +64,8 @@ void Constant::destroyConstantImpl() {
delete this;
}
static std::map<const Type *, Constant*> NullValues;
// Static constructor to create a '0' constant of arbitrary type...
Constant *Constant::getNullValue(const Type *Ty) {
switch (Ty->getPrimitiveID()) {
@ -117,18 +119,33 @@ Constant *Constant::getNullValue(const Type *Ty) {
return ConstantPointerNull::get(cast<PointerType>(Ty));
case Type::StructTyID: {
if (!Ty->isAbstract())
if (Constant *V = NullValues[Ty])
return V;
const StructType *ST = cast<StructType>(Ty);
std::vector<Constant*> Elements;
Elements.resize(ST->getNumElements());
for (unsigned i = 0, e = ST->getNumElements(); i != e; ++i)
Elements[i] = Constant::getNullValue(ST->getElementType(i));
return ConstantStruct::get(ST, Elements);
Constant *Ret = ConstantStruct::get(ST, Elements);
if (!Ty->isAbstract())
NullValues[Ty] = Ret;
return Ret;
}
case Type::ArrayTyID: {
if (!Ty->isAbstract())
if (Constant *V = NullValues[Ty])
return V;
const ArrayType *AT = cast<ArrayType>(Ty);
Constant *El = Constant::getNullValue(AT->getElementType());
unsigned NumElements = AT->getNumElements();
return ConstantArray::get(AT, std::vector<Constant*>(NumElements, El));
Constant *Ret = ConstantArray::get(AT,
std::vector<Constant*>(NumElements, El));
if (!Ty->isAbstract())
NullValues[Ty] = Ret;
return Ret;
}
default:
// Function, Type, Label, or Opaque type?