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Remove some more set operations 

llvm-svn: 18840
This commit is contained in:
Chris Lattner 2004-12-12 22:22:18 +00:00
parent a538439bf0
commit d4298781c1
1 changed files with 2 additions and 6 deletions
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8
llvm/lib/Transforms/Scalar/ADCE.cpp
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@ -283,10 +283,8 @@ bool ADCE::doADCE() {
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!
if (AliveBlocks.insert(BB).second) // Basic block not alive yet.
markBlockAlive(BB); // Make it so now!
}
// PHI nodes are a special case, because the incoming values are actually
// defined in the predecessor nodes of this block, meaning that the PHI
@ -294,10 +292,8 @@ bool ADCE::doADCE() {
//
if (PHINode *PN = dyn_cast<PHINode>(I))
for (pred_iterator PI = pred_begin(BB), PE = pred_end(BB); PI != PE; ++PI)
if (!AliveBlocks.count(*PI)) {
AliveBlocks.insert(BB); // Block is now ALIVE!
if (AliveBlocks.insert(*PI).second) // Block is now ALIVE!
markBlockAlive(*PI);
}
// Loop over all of the operands of the live instruction, making sure that
// they are known to be alive as well...