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Do not mark instructions in unreachable sections of the function as live.

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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
This commit is contained in:
Chris Lattner 2004-05-04 17:00:46 +00:00
parent b71ebdf03c
commit b9110c61fb
1 changed files with 5 additions and 2 deletions
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7
lib/Transforms/Scalar/ADCE.cpp
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@ -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!