Lines Matching defs:IBB

1038   // Look at blocks (IBB) with multiple predecessors (PBB).
1041   // to IBB, and
1043   // not IBB; this may require adding back an unconditional branch to IBB
1045   //   Bcc IBB
1049   // with a conceptual B to IBB after that, which never actually exists.
1061     MachineBasicBlock *IBB = &*I;
1066     // Bail if merging after placement and IBB is the loop header because
1067     // -- If merging predecessors that belong to the same loop as IBB, the
1072     // --If merging predecessors that do not belong to the same loop as IBB, the
1073     // loop info of IBB's loop and the other loops may be affected. Calling the
1077       ML = MLI->getLoopFor(IBB);
1078       if (ML && IBB == ML->getHeader())
1090       if (PBB == IBB)
1103       // same loop as IBB.  The reason is the same as above when skipping loop
1112         // Failing case: IBB is the target of a cbr, and we cannot reverse the
1115         if (!Cond.empty() && TBB == IBB) {
1132             TII->insertBranch(*PBB, (TBB == IBB) ? FBB : TBB, nullptr,
1148       MadeChange |= TryTailMergeBlocks(IBB, PredBB, MinCommonTailLength);
1155       FixTail(MergePotentials.begin()->getBlock(), IBB, TII,