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[PM/LoopUnswitch] Avoid pointlessly creating an exit block set.
This code can just test whether blocks are *in* the loop, which we already have a dedicated set tracking in the loop itself. llvm-svn: 332004
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@ -192,12 +192,6 @@ static bool unswitchTrivialBranch(Loop &L, BranchInst &BI, DominatorTree &DT,
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if (!L.isLoopInvariant(LoopCond))
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return false;
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// FIXME: We should compute this once at the start and update it!
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SmallVector<BasicBlock *, 16> ExitBlocks;
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L.getExitBlocks(ExitBlocks);
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SmallPtrSet<BasicBlock *, 16> ExitBlockSet(ExitBlocks.begin(),
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ExitBlocks.end());
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// Check to see if a successor of the branch is guaranteed to
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// exit through a unique exit block without having any
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// side-effects. If so, determine the value of Cond that causes
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@ -206,17 +200,14 @@ static bool unswitchTrivialBranch(Loop &L, BranchInst &BI, DominatorTree &DT,
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ConstantInt *Replacement = ConstantInt::getFalse(BI.getContext());
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int LoopExitSuccIdx = 0;
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auto *LoopExitBB = BI.getSuccessor(0);
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if (!ExitBlockSet.count(LoopExitBB)) {
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if (L.contains(LoopExitBB)) {
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std::swap(CondVal, Replacement);
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LoopExitSuccIdx = 1;
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LoopExitBB = BI.getSuccessor(1);
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if (!ExitBlockSet.count(LoopExitBB))
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if (L.contains(LoopExitBB))
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return false;
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}
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auto *ContinueBB = BI.getSuccessor(1 - LoopExitSuccIdx);
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assert(L.contains(ContinueBB) &&
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"Cannot have both successors exit and still be in the loop!");
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auto *ParentBB = BI.getParent();
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if (!areLoopExitPHIsLoopInvariant(L, *ParentBB, *LoopExitBB))
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return false;
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@ -310,21 +301,15 @@ static bool unswitchTrivialSwitch(Loop &L, SwitchInst &SI, DominatorTree &DT,
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auto *ParentBB = SI.getParent();
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// FIXME: We should compute this once at the start and update it!
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SmallVector<BasicBlock *, 16> ExitBlocks;
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L.getExitBlocks(ExitBlocks);
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SmallPtrSet<BasicBlock *, 16> ExitBlockSet(ExitBlocks.begin(),
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ExitBlocks.end());
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SmallVector<int, 4> ExitCaseIndices;
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for (auto Case : SI.cases()) {
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auto *SuccBB = Case.getCaseSuccessor();
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if (ExitBlockSet.count(SuccBB) &&
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if (!L.contains(SuccBB) &&
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areLoopExitPHIsLoopInvariant(L, *ParentBB, *SuccBB))
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ExitCaseIndices.push_back(Case.getCaseIndex());
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}
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BasicBlock *DefaultExitBB = nullptr;
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if (ExitBlockSet.count(SI.getDefaultDest()) &&
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if (!L.contains(SI.getDefaultDest()) &&
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areLoopExitPHIsLoopInvariant(L, *ParentBB, *SI.getDefaultDest()) &&
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!isa<UnreachableInst>(SI.getDefaultDest()->getTerminator()))
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DefaultExitBB = SI.getDefaultDest();
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