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Be much more careful about how we update instructions outside of the loop
using instructions inside of the loop. This should fix the MishaTest failure from last night. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@13038 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -210,16 +210,22 @@ bool LoopUnroll::visitLoop(Loop *L) {
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}
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// If there was more than one iteration, replace any uses of values computed
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// in the loop with values computed during last iteration of the loop.
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if (TripCount != 1)
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for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; ++I) {
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std::vector<User*> Users(I->use_begin(), I->use_end());
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for (unsigned i = 0, e = Users.size(); i != e; ++i) {
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Instruction *UI = cast<Instruction>(Users[i]);
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if (UI->getParent() != BB && UI->getParent() != NewBlock)
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UI->replaceUsesOfWith(I, LastValueMap[I]);
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}
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// in the loop with values computed during the last iteration of the loop.
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if (TripCount != 1) {
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std::set<User*> Users;
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for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; ++I)
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Users.insert(I->use_begin(), I->use_end());
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// We don't want to reprocess entries with PHI nodes in them. For this
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// reason, we look at each operand of each user exactly once, performing the
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// stubstitution exactly once.
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for (std::set<User*>::iterator UI = Users.begin(), E = Users.end(); UI != E;
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++UI) {
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Instruction *I = cast<Instruction>(*UI);
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if (I->getParent() != BB && I->getParent() != NewBlock)
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RemapInstruction(I, LastValueMap);
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}
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}
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// Now that we cloned the block as many times as we needed, stitch the new
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// code into the original block and delete the temporary block.
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