404   // Create the fall-through block.  in SplitMBBAt()
412   // Add an edge from CurMBB to NewMBB for the fall-through.  in SplitMBBAt()
604   // a position where the other could fall through into it, merge any number  in ProfitableToMerge()
905           dbgs() << "  which has fall-through from "  in TryTailMergeBlocks()
940     // If there are two blocks, check to see if one can be made to fall through  in TryTailMergeBlocks()
953       // Otherwise just pick one, favoring the fall-through predecessor if  in TryTailMergeBlocks()
1248 /// fall-through to MBB1 than to fall through into MBB2.  This has to return
1256   // MBB1 doesn't, we prefer to fall through into MBB1.  This allows us to  in IsBetterFallthrough()
1265   // will fall through to the next  in IsBetterFallthrough()
1353   // If this block is empty, make everyone use its fall-through, not the block  in OptimizeBlock()
1405     // a fall-through.  in OptimizeBlock()
1420     // has been used, but it can happen if tail merging splits a fall-through  in OptimizeBlock()
1475     // fall-through.  in OptimizeBlock()
1490     // falls through into this block, and if it would otherwise fall through  in OptimizeBlock()
1504       // last.  Only do the swap if one is clearly better to fall through than  in OptimizeBlock()
1511         // Reverse the branch so we will fall through on the previous true cond.  in OptimizeBlock()
1557         // that we might have to re-arrange the CFG to fall through to the other  in OptimizeBlock()
1689   // If the prior block doesn't fall through into this block, and if this  in OptimizeBlock()
1690   // block doesn't fall through into some other block, see if we can find a  in OptimizeBlock()
1691   // place to move this block where a fall-through will happen.  in OptimizeBlock()
1693     // Now we know that there was no fall-through into this block, check to  in OptimizeBlock()
1694     // see if it has a fall-through into its successor.  in OptimizeBlock()
1698       // Check all the predecessors of this block.  If one of them has no fall  in OptimizeBlock()
1710           // If the current block doesn't fall through, just move it.  in OptimizeBlock()
1711           // If the current block can fall through and does not end with a  in OptimizeBlock()
1742           // If this block doesn't already fall-through to that successor, and  in OptimizeBlock()
1743           // if the succ doesn't already have a block that can fall through into  in OptimizeBlock()
1755       // the block before this one would be a fall-through if this block were  in OptimizeBlock()