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Do not mark instructions in unreachable sections of the function as live.
This fixes PR332 and ADCE/2004-05-04-UnreachableBlock.llx git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@13349 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -215,8 +215,10 @@ bool ADCE::doADCE() {
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// instructions live in basic blocks that are unreachable. These blocks will
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// be eliminated later, along with the instructions inside.
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//
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for (df_iterator<Function*> BBI = df_begin(Func), BBE = df_end(Func);
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BBI != BBE; ++BBI) {
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std::set<BasicBlock*> ReachableBBs;
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for (df_ext_iterator<BasicBlock*>
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BBI = df_ext_begin(&Func->front(), ReachableBBs),
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BBE = df_ext_end(&Func->front(), ReachableBBs); BBI != BBE; ++BBI) {
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BasicBlock *BB = *BBI;
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for (BasicBlock::iterator II = BB->begin(), EI = BB->end(); II != EI; ) {
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Instruction *I = II++;
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@ -279,6 +281,7 @@ bool ADCE::doADCE() {
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WorkList.pop_back();
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BasicBlock *BB = I->getParent();
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if (!ReachableBBs.count(BB)) continue;
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if (!AliveBlocks.count(BB)) { // Basic block not alive yet...
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AliveBlocks.insert(BB); // Block is now ALIVE!
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markBlockAlive(BB); // Make it so now!
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