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Remove function left over from other jump threading cleanup.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86289 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eli Friedman 2009-11-06 21:24:57 +00:00
parent 29d727b0c8
commit 50591ab1ea
1 changed files with 0 additions and 24 deletions
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24
lib/Transforms/Scalar/JumpThreading.cpp
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@ -75,7 +75,6 @@ namespace {
bool ThreadEdge(BasicBlock *BB, BasicBlock *PredBB, BasicBlock *SuccBB);
bool DuplicateCondBranchOnPHIIntoPred(BasicBlock *BB,
BasicBlock *PredBB);
BasicBlock *FactorCommonPHIPreds(PHINode *PN, Value *Val);
typedef SmallVectorImpl<std::pair<ConstantInt*,
BasicBlock*> > PredValueInfo;
@ -204,29 +203,6 @@ void JumpThreading::FindLoopHeaders(Function &F) {
LoopHeaders.insert(const_cast<BasicBlock*>(Edges[i].second));
}
/// FactorCommonPHIPreds - If there are multiple preds with the same incoming
/// value for the PHI, factor them together so we get one block to thread for
/// the whole group.
/// This is important for things like "phi i1 [true, true, false, true, x]"
/// where we only need to clone the block for the true blocks once.
///
BasicBlock *JumpThreading::FactorCommonPHIPreds(PHINode *PN, Value *Val) {
SmallVector<BasicBlock*, 16> CommonPreds;
for (unsigned i = 0, e = PN->getNumIncomingValues(); i != e; ++i)
if (PN->getIncomingValue(i) == Val)
CommonPreds.push_back(PN->getIncomingBlock(i));
if (CommonPreds.size() == 1)
return CommonPreds[0];
DEBUG(errs() << " Factoring out " << CommonPreds.size()
<< " common predecessors.\n");
return SplitBlockPredecessors(PN->getParent(),
&CommonPreds[0], CommonPreds.size(),
".thr_comm", this);
}
/// GetResultOfComparison - Given an icmp/fcmp predicate and the left and right
/// hand sides of the compare instruction, try to determine the result. If the
/// result can not be determined, a null pointer is returned.