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avoid a completely unneeded linear walk.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92221 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2009-12-28 09:32:10 +00:00
parent 496425774e
commit df58389ef1
2 changed files with 10 additions and 13 deletions
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2
include/llvm/Metadata.h
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@ -102,7 +102,7 @@ class MDNode : public MetadataBase, public FoldingSetNode {
};
// Replace each instance of F from the element list of this node with T.
void replaceElement(Value *F, Value *T);
void replaceElement(MDNodeElement *Op, Value *NewVal);
protected:
explicit MDNode(LLVMContext &C, Value *const *Vals, unsigned NumVals,

21
lib/VMCore/Metadata.cpp
View File

@ -76,11 +76,11 @@ public:
void MDNodeElement::deleted() {
Parent->replaceElement(this->operator Value*(), 0);
Parent->replaceElement(this, 0);
}
void MDNodeElement::allUsesReplacedWith(Value *NV) {
Parent->replaceElement(this->operator Value*(), NV);
Parent->replaceElement(this, NV);
}
@ -142,8 +142,10 @@ Value *MDNode::getElement(unsigned i) const {
// Replace value from this node's element list.
void MDNode::replaceElement(Value *From, Value *To) {
if (From == To || !getType())
void MDNode::replaceElement(MDNodeElement *Op, Value *To) {
Value *From = *Op;
if (From == To)
return;
LLVMContextImpl *pImpl = getType()->getContext().pImpl;
@ -151,14 +153,9 @@ void MDNode::replaceElement(Value *From, Value *To) {
// Remove "this" from the context map. FoldingSet doesn't have to reprofile
// this node to remove it, so we don't care what state the operands are in.
pImpl->MDNodeSet.RemoveNode(this);
// Find value. This is a linear search, do something if it consumes
// lot of time. It is possible that to have multiple instances of
// From in this MDNode's element list.
for (unsigned i = 0, e = getNumElements(); i != e; ++i) {
if (Operands[i] == From)
Operands[i].set(To, this);
}
// Update the operand.
Op->set(To, this);
// Insert updated "this" into the context's folding node set.
// If a node with same element list already exist then before inserting