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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35841 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson 2007-04-09 22:31:43 +00:00
parent b445d0cbb9
commit 0cd0461873
1 changed files with 36 additions and 36 deletions
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72
lib/Transforms/Utils/LoopSimplify.cpp
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@ -420,7 +420,7 @@ static void AddBlockAndPredsToSet(BasicBlock *BB, BasicBlock *StopBlock,
/// FindPHIToPartitionLoops - The first part of loop-nestification is to find a
/// PHI node that tells us how to partition the loops.
static PHINode *FindPHIToPartitionLoops(Loop *L, ETForest *EF,
AliasAnalysis *AA) {
AliasAnalysis *AA) {
for (BasicBlock::iterator I = L->getHeader()->begin(); isa<PHINode>(I); ) {
PHINode *PN = cast<PHINode>(I);
++I;
@ -676,11 +676,11 @@ void LoopSimplify::InsertUniqueBackedgeBlock(Loop *L) {
// Returns true if BasicBlock A dominates at least one block in vector B
// Helper function for UpdateDomInfoForRevectoredPreds
static bool BlockDominatesAny(BasicBlock* A, std::vector<BasicBlock*>& B, ETForest& ETF) {
for (std::vector<BasicBlock*>::iterator BI = B.begin(), BE = B.end(); BI != BE; ++BI) {
if (ETF.dominates(A, *BI))
return true;
}
return false;
for (std::vector<BasicBlock*>::iterator BI = B.begin(), BE = B.end(); BI != BE; ++BI) {
if (ETF.dominates(A, *BI))
return true;
}
return false;
}
/// UpdateDomInfoForRevectoredPreds - This method is used to update the four
@ -852,36 +852,36 @@ void LoopSimplify::UpdateDomInfoForRevectoredPreds(BasicBlock *NewBB,
// their dominance frontier must be updated to contain NewBB instead.
//
for (Function::iterator FI = NewBB->getParent()->begin(),
FE = NewBB->getParent()->end(); FI != FE; ++FI) {
DominanceFrontier::iterator DFI = DF->find(FI);
if (DFI == DF->end()) continue; // unreachable block.
// Only consider dominators of NewBBSucc
if (!DFI->second.count(NewBBSucc)) continue;
if (BlockDominatesAny(FI, PredBlocks, ETF)) {
// If NewBBSucc should not stay in our dominator frontier, remove it.
// We remove it unless there is a predecessor of NewBBSucc that we
// dominate, but we don't strictly dominate NewBBSucc.
bool ShouldRemove = true;
if ((BasicBlock*)FI == NewBBSucc || !ETF.dominates(FI, NewBBSucc)) {
// Okay, we know that PredDom does not strictly dominate NewBBSucc.
// Check to see if it dominates any predecessors of NewBBSucc.
for (pred_iterator PI = pred_begin(NewBBSucc),
E = pred_end(NewBBSucc); PI != E; ++PI)
if (ETF.dominates(FI, *PI)) {
ShouldRemove = false;
break;
}
if (ShouldRemove)
DF->removeFromFrontier(DFI, NewBBSucc);
DF->addToFrontier(DFI, NewBB);
break;
}
}
}
}
FE = NewBB->getParent()->end(); FI != FE; ++FI) {
DominanceFrontier::iterator DFI = DF->find(FI);
if (DFI == DF->end()) continue; // unreachable block.
// Only consider dominators of NewBBSucc
if (!DFI->second.count(NewBBSucc)) continue;
if (BlockDominatesAny(FI, PredBlocks, ETF)) {
// If NewBBSucc should not stay in our dominator frontier, remove it.
// We remove it unless there is a predecessor of NewBBSucc that we
// dominate, but we don't strictly dominate NewBBSucc.
bool ShouldRemove = true;
if ((BasicBlock*)FI == NewBBSucc || !ETF.dominates(FI, NewBBSucc)) {
// Okay, we know that PredDom does not strictly dominate NewBBSucc.
// Check to see if it dominates any predecessors of NewBBSucc.
for (pred_iterator PI = pred_begin(NewBBSucc),
E = pred_end(NewBBSucc); PI != E; ++PI)
if (ETF.dominates(FI, *PI)) {
ShouldRemove = false;
break;
}
if (ShouldRemove)
DF->removeFromFrontier(DFI, NewBBSucc);
DF->addToFrontier(DFI, NewBB);
break;
}
}
}
}
}