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avoid copying sets and vectors around. 

llvm-svn: 36017
This commit is contained in:
Chris Lattner 2007-04-14 22:10:17 +00:00
parent e7ce8f23f6
commit a6b5660209
1 changed files with 6 additions and 7 deletions
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13
llvm/lib/Transforms/Utils/LCSSA.cpp
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@ -69,7 +69,8 @@ namespace {
AU.addRequired<DominatorTree>();
}
private:
SetVector<Instruction*> getLoopValuesUsedOutsideLoop(Loop *L);
void getLoopValuesUsedOutsideLoop(Loop *L,
SetVector<Instruction*> &AffectedValues);
Value *GetValueForBlock(DominatorTree::Node *BB, Instruction *OrigInst,
std::map<DominatorTree::Node*, Value*> &Phis);
@ -110,7 +111,8 @@ bool LCSSA::visitSubloop(Loop* L) {
LoopBlocks.insert(LoopBlocks.end(), L->block_begin(), L->block_end());
std::sort(LoopBlocks.begin(), LoopBlocks.end());
SetVector<Instruction*> AffectedValues = getLoopValuesUsedOutsideLoop(L);
SetVector<Instruction*> AffectedValues;
getLoopValuesUsedOutsideLoop(L, AffectedValues);
// If no values are affected, we can save a lot of work, since we know that
// nothing will be changed.
@ -196,14 +198,12 @@ void LCSSA::ProcessInstruction(Instruction *Instr,
/// getLoopValuesUsedOutsideLoop - Return any values defined in the loop that
/// are used by instructions outside of it.
SetVector<Instruction*> LCSSA::getLoopValuesUsedOutsideLoop(Loop *L) {
void LCSSA::getLoopValuesUsedOutsideLoop(Loop *L,
SetVector<Instruction*> &AffectedValues) {
// FIXME: For large loops, we may be able to avoid a lot of use-scanning
// by using dominance information. In particular, if a block does not
// dominate any of the loop exits, then none of the values defined in the
// block could be used outside the loop.
SetVector<Instruction*> AffectedValues;
for (Loop::block_iterator BB = L->block_begin(), E = L->block_end();
BB != E; ++BB) {
for (BasicBlock::iterator I = (*BB)->begin(), E = (*BB)->end(); I != E; ++I)
@ -221,7 +221,6 @@ SetVector<Instruction*> LCSSA::getLoopValuesUsedOutsideLoop(Loop *L) {
}
}
}
return AffectedValues;
}
/// GetValueForBlock - Get the value to use within the specified basic block.