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Fix grammar, add comment
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7967 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -10,7 +10,7 @@
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// Loop exit-block insertion guarantees that all exit blocks from the loop
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// (blocks which are outside of the loop that have predecessors inside of the
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// loop) are dominated by the loop header. This simplifies transformations such
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// as store-sinking that is built into LICM.
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// as store-sinking that are built into LICM.
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//
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// Note that the simplifycfg pass will clean up blocks which are split out but
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// end up being unnecessary, so usage of this pass does not neccesarily
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@ -91,6 +91,9 @@ bool Preheaders::ProcessLoop(Loop *L) {
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Changed = true;
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}
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// Regardless of whether or not we added a preheader to the loop we must
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// guarantee that the preheader dominates all exit nodes. If there are any
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// exit nodes not dominated, split them now.
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DominatorSet &DS = getAnalysis<DominatorSet>();
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BasicBlock *Header = L->getHeader();
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for (unsigned i = 0, e = L->getExitBlocks().size(); i != e; ++i)
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