[llvm-dev] Inserting a new MachineBasicBlock between two existing MachineBasicBlocks

Ziqiang Patrick Huang via llvm-dev llvm-dev at lists.llvm.org
Mon Aug 17 14:26:59 PDT 2015

Hi all,

Suppose I have two basicblock  A->B, and I wanted to insert C between them
so that A->B->C.

By looking at MachineBasicBlock::SplitCriticalEdge, I did following similar

MachineBasicBlock *B = MF.CreateMachineBasicBlock();
MF.insert(std::next(MachineFunction::iterator(A)), B);

But when I try to add the new basicblock into SlotIndexes, it fails at the

assert(unsigned(mbb->getNumber()) == MBBRanges.size() && "Blocks must be
added in order");

So I thought maybe I should add it at the end of the function, so I tried

MF.insert(MF.end(), B), but it still fails, so I'm wondering what's the
right way to do it.

I'm doing it at MachineScheduler Pass.

Thanks in Advance
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