lib/CodeGen/CodeGenPrepare.cpp

6133   BasicBlock *FalseBlock = nullptr;
6151       if (FalseBlock == nullptr) {
6152         FalseBlock = BasicBlock::Create(SI->getContext(), "select.false.sink",
6154         FalseBranch = BranchInst::Create(EndBlock, FalseBlock);
6164   if (TrueBlock == FalseBlock) {
6168     FalseBlock = BasicBlock::Create(SI->getContext(), "select.false",
6170     auto *FalseBranch = BranchInst::Create(EndBlock, FalseBlock);
6182     FT = FalseBlock;
6184   } else if (FalseBlock == nullptr) {
6187     FalseBlock = StartBlock;
6190     FT = FalseBlock;
6205     PN->addIncoming(getTrueOrFalseValue(SI, false, INS), FalseBlock);