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[StructurizeCFG] Refactor OrderNodes. 

Summary:
No need to copy the RPOT vector before using it.  Switch from std::map
to SmallDenseMap.  Get rid of an unused variable (TempVisited).  Get rid
of a typedef, RNVector, which is now used only once.

Differential Revision: https://reviews.llvm.org/D26997

llvm-svn: 287721
This commit is contained in:
Justin Lebar 2016-11-22 23:14:11 +00:00
parent 23aaf60277
commit 6c0f25aec6
1 changed files with 6 additions and 12 deletions
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18
llvm/lib/Transforms/Scalar/StructurizeCFG.cpp
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@ -175,7 +175,7 @@ class StructurizeCFG : public RegionPass {
DominatorTree *DT;
LoopInfo *LI;
RNVector Order;
SmallVector<RegionNode *, 8> Order;
BBSet Visited;
BBPhiMap DeletedPhis;
@ -288,17 +288,13 @@ bool StructurizeCFG::doInitialization(Region *R, RGPassManager &RGM) {
/// \brief Build up the general order of nodes
void StructurizeCFG::orderNodes() {
RNVector TempOrder;
ReversePostOrderTraversal<Region*> RPOT(ParentRegion);
TempOrder.append(RPOT.begin(), RPOT.end());
std::map<Loop*, unsigned> LoopBlocks;
SmallDenseMap<Loop*, unsigned, 8> LoopBlocks;
// The reverse post-order traversal of the list gives us an ordering close
// to what we want. The only problem with it is that sometimes backedges
// for outer loops will be visited before backedges for inner loops.
for (RegionNode *RN : TempOrder) {
for (RegionNode *RN : RPOT) {
BasicBlock *BB = RN->getEntry();
Loop *Loop = LI->getLoopFor(BB);
++LoopBlocks[Loop];
@ -306,8 +302,7 @@ void StructurizeCFG::orderNodes() {
unsigned CurrentLoopDepth = 0;
Loop *CurrentLoop = nullptr;
BBSet TempVisited;
for (RNVector::iterator I = TempOrder.begin(), E = TempOrder.end(); I != E; ++I) {
for (auto I = RPOT.begin(), E = RPOT.end(); I != E; ++I) {
BasicBlock *BB = (*I)->getEntry();
unsigned LoopDepth = LI->getLoopDepth(BB);
@ -318,7 +313,7 @@ void StructurizeCFG::orderNodes() {
// Make sure we have visited all blocks in this loop before moving back to
// the outer loop.
RNVector::iterator LoopI = I;
auto LoopI = I;
while (unsigned &BlockCount = LoopBlocks[CurrentLoop]) {
LoopI++;
BasicBlock *LoopBB = (*LoopI)->getEntry();
@ -330,9 +325,8 @@ void StructurizeCFG::orderNodes() {
}
CurrentLoop = LI->getLoopFor(BB);
if (CurrentLoop) {
if (CurrentLoop)
LoopBlocks[CurrentLoop]--;
}
CurrentLoopDepth = LoopDepth;
Order.push_back(*I);