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Reduce the amount of searching this assertion does. On a testcase of mine,
this reduces the time for -simplifycfg in a debug build from 106s to 14.82s git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@20286 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -136,8 +136,10 @@ void BasicBlock::dropAllReferences() {
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// called while the predecessor still refers to this block.
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//
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void BasicBlock::removePredecessor(BasicBlock *Pred) {
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assert(find(pred_begin(this), pred_end(this), Pred) != pred_end(this) &&
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assert((getNumUses() > 16 ||// Reduce cost of this assertion for complex CFGs.
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find(pred_begin(this), pred_end(this), Pred) != pred_end(this)) &&
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"removePredecessor: BB is not a predecessor!");
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if (InstList.empty()) return;
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PHINode *APN = dyn_cast<PHINode>(&front());
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if (!APN) return; // Quick exit.
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