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avoid an unneeded vector copy. This speeds up mem2reg on the testcase

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in PR1432 by 6%


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40803 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2007-08-04 01:07:49 +00:00
parent ac4aa4be9b
commit 63cdcaa3d6
1 changed files with 9 additions and 1 deletions
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10
lib/Transforms/Utils/PromoteMemoryToRegister.cpp
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@ -76,11 +76,18 @@ namespace {
// Data package used by RenamePass()
class VISIBILITY_HIDDEN RenamePassData {
public:
RenamePassData() {}
RenamePassData(BasicBlock *B, BasicBlock *P,
const std::vector<Value *> &V) : BB(B), Pred(P), Values(V) {}
BasicBlock *BB;
BasicBlock *Pred;
std::vector<Value *> Values;
void swap(RenamePassData &RHS) {
std::swap(BB, RHS.BB);
std::swap(Pred, RHS.Pred);
Values.swap(RHS.Values);
}
};
struct VISIBILITY_HIDDEN PromoteMem2Reg {
@ -406,7 +413,8 @@ void PromoteMem2Reg::run() {
std::vector<RenamePassData> RenamePassWorkList;
RenamePassWorkList.push_back(RenamePassData(F.begin(), 0, Values));
while(!RenamePassWorkList.empty()) {
RenamePassData RPD = RenamePassWorkList.back();
RenamePassData RPD;
RPD.swap(RenamePassWorkList.back());
RenamePassWorkList.pop_back();
// RenamePass may add new worklist entries.
RenamePass(RPD.BB, RPD.Pred, RPD.Values, RenamePassWorkList);