diff options
| -rw-r--r-- | llvm/lib/Transforms/Scalar/ADCE.cpp | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/llvm/lib/Transforms/Scalar/ADCE.cpp b/llvm/lib/Transforms/Scalar/ADCE.cpp index 3423fdd4929..98f8bed5160 100644 --- a/llvm/lib/Transforms/Scalar/ADCE.cpp +++ b/llvm/lib/Transforms/Scalar/ADCE.cpp @@ -215,8 +215,10 @@ bool ADCE::doADCE() { // instructions live in basic blocks that are unreachable. These blocks will // be eliminated later, along with the instructions inside. // - for (df_iterator<Function*> BBI = df_begin(Func), BBE = df_end(Func); - BBI != BBE; ++BBI) { + std::set<BasicBlock*> ReachableBBs; + for (df_ext_iterator<BasicBlock*> + BBI = df_ext_begin(&Func->front(), ReachableBBs), + BBE = df_ext_end(&Func->front(), ReachableBBs); BBI != BBE; ++BBI) { BasicBlock *BB = *BBI; for (BasicBlock::iterator II = BB->begin(), EI = BB->end(); II != EI; ) { Instruction *I = II++; @@ -279,6 +281,7 @@ bool ADCE::doADCE() { WorkList.pop_back(); BasicBlock *BB = I->getParent(); + if (!ReachableBBs.count(BB)) continue; if (!AliveBlocks.count(BB)) { // Basic block not alive yet... AliveBlocks.insert(BB); // Block is now ALIVE! markBlockAlive(BB); // Make it so now! |
