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LPPassManager::deleteLoopFromQueue() add meat. Cut-n-paste code from
LoopUnswitch pass. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34977 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -113,6 +113,8 @@ private:
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std::deque<Loop *> LQ;
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bool skipThisLoop;
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bool redoThisLoop;
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LoopInfo *LI;
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Loop *CurrentLoop;
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};
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} // End llvm namespace
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@ -24,13 +24,77 @@ using namespace llvm;
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LPPassManager::LPPassManager(int Depth) : PMDataManager(Depth) {
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skipThisLoop = false;
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redoThisLoop = false;
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LI = NULL;
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CurrentLoop = NULL;
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}
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/// Delete loop from the loop queue. This is used by Loop pass to inform
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/// Loop Pass Manager that it should skip rest of the passes for this loop.
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/// Delete loop from the loop queue and loop hierarcy (LoopInfo).
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void LPPassManager::deleteLoopFromQueue(Loop *L) {
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// Do not pop loop from LQ here. It will be done by runOnFunction while loop.
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skipThisLoop = true;
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if (Loop *ParentLoop = L->getParentLoop()) { // Not a top-level loop.
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// Reparent all of the blocks in this loop. Since BBLoop had a parent,
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// they are now all in it.
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for (Loop::block_iterator I = L->block_begin(), E = L->block_end();
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I != E; ++I)
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if (LI->getLoopFor(*I) == L) // Don't change blocks in subloops.
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LI->changeLoopFor(*I, ParentLoop);
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// Remove the loop from its parent loop.
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for (Loop::iterator I = ParentLoop->begin(), E = ParentLoop->end();;
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++I) {
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assert(I != E && "Couldn't find loop");
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if (*I == L) {
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ParentLoop->removeChildLoop(I);
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break;
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}
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}
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// Move all subloops into the parent loop.
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while (L->begin() != L->end())
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ParentLoop->addChildLoop(L->removeChildLoop(L->end()-1));
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} else {
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// Reparent all of the blocks in this loop. Since BBLoop had no parent,
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// they no longer in a loop at all.
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for (unsigned i = 0; i != L->getBlocks().size(); ++i) {
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// Don't change blocks in subloops.
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if (LI->getLoopFor(L->getBlocks()[i]) == L) {
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LI->removeBlock(L->getBlocks()[i]);
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--i;
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}
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}
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// Remove the loop from the top-level LoopInfo object.
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for (LoopInfo::iterator I = LI->begin(), E = LI->end();; ++I) {
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assert(I != E && "Couldn't find loop");
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if (*I == L) {
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LI->removeLoop(I);
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break;
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}
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}
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// Move all of the subloops to the top-level.
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while (L->begin() != L->end())
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LI->addTopLevelLoop(L->removeChildLoop(L->end()-1));
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}
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delete L;
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// If L is current loop then skip rest of the passes and let
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// runOnFunction remove L from LQ. Otherwise, remove L from LQ now
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// and continue applying other passes on CurrentLoop.
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if (CurrentLoop == L) {
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skipThisLoop = true;
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return;
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}
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for (std::deque<Loop *>::iterator I = LQ.begin(),
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E = LQ.end(); I != E; ++I) {
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if (*I == L) {
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LQ.erase(I);
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break;
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}
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}
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}
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// Reoptimize this loop. LPPassManager will re-insert this loop into the
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@ -72,7 +136,7 @@ bool LPPassManager::runOnFunction(Function &F) {
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// Walk Loops
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while (!LQ.empty()) {
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Loop *L = LQ.back();
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CurrentLoop = LQ.back();
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skipThisLoop = false;
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redoThisLoop = false;
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@ -91,7 +155,7 @@ bool LPPassManager::runOnFunction(Function &F) {
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StartPassTimer(P);
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LoopPass *LP = dynamic_cast<LoopPass *>(P);
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assert (LP && "Invalid LPPassManager member");
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LP->runOnLoop(L, *this);
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LP->runOnLoop(CurrentLoop, *this);
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StopPassTimer(P);
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if (Changed)
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@ -111,7 +175,7 @@ bool LPPassManager::runOnFunction(Function &F) {
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LQ.pop_back();
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if (redoThisLoop)
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LQ.push_back(L);
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LQ.push_back(CurrentLoop);
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}
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// Finalization
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