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refactor some code, no functionality change.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50094 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -57,6 +57,8 @@ namespace {
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bool runOnFunction(Function &F);
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bool ThreadBlock(BasicBlock *BB);
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void ThreadEdge(BasicBlock *BB, BasicBlock *PredBB, BasicBlock *SuccBB);
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bool ProcessJumpOnPHI(PHINode *PN);
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};
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char JumpThreading::ID = 0;
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RegisterPass<JumpThreading> X("jump-threading", "Jump Threading");
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@ -158,8 +160,17 @@ bool JumpThreading::ThreadBlock(BasicBlock *BB) {
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// See if this is a phi node in the current block.
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PHINode *PN = dyn_cast<PHINode>(Condition);
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if (!PN || PN->getParent() != BB) return false;
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if (PN && PN->getParent() == BB)
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return ProcessJumpOnPHI(PN);
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return false;
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}
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/// ProcessJumpOnPHI - We have a conditional branch of switch on a PHI node in
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/// the current block. See if there are any simplifications we can do based on
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/// inputs to the phi node.
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///
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bool JumpThreading::ProcessJumpOnPHI(PHINode *PN) {
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// See if the phi node has any constant values. If so, we can determine where
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// the corresponding predecessor will branch.
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unsigned PredNo = ~0U;
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@ -177,6 +188,7 @@ bool JumpThreading::ThreadBlock(BasicBlock *BB) {
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return false;
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// See if the cost of duplicating this block is low enough.
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BasicBlock *BB = PN->getParent();
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unsigned JumpThreadCost = getJumpThreadDuplicationCost(BB);
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if (JumpThreadCost > Threshold) {
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DOUT << " Not threading BB '" << BB->getNameStart()
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@ -210,7 +222,6 @@ bool JumpThreading::ThreadBlock(BasicBlock *BB) {
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".thr_comm", this);
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}
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DOUT << " Threading edge from '" << PredBB->getNameStart() << "' to '"
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<< SuccBB->getNameStart() << "' with cost: " << JumpThreadCost
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<< ", across block:\n "
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