search for: duplicateinstruction

Hi all, I have faced a little bit of a strange transformation from the TailDuplicatePass In CodeGen. When the pass clones the contents of TailBB into PredBB, the bundled instructions in TailBB are not bundled in PredBB. I think the reason why it is not bundled is that the 'DuplicateInstruction' function does not set up the flag of the first instruction of the bundle in PredBB when it is cloned from TailBB. If the first instruction of the bundle is set up in PredBB, the 'MachineBasicBlock->insert()' function would automatically put the next instructions into the bundle....