================
@@ -614,6 +614,61 @@ void VPBasicBlock::print(raw_ostream &O, const Twine 
&Indent,
   printSuccessors(O, Indent);
 }
 #endif
+static void cloneCFG(VPBlockBase *Entry,
+                     DenseMap<VPBlockBase *, VPBlockBase *> &Old2NewVPBlocks);
----------------
ayalz wrote:

This cloning is recursive, so perhaps more accurately called `cloneHCFG()`.
It also clones a (maximal(*)) SESE region, so could be called `cloneSESE()`, 
and return a pair of VPB's - the new entry and new exit? Could 
`Old2NewVPBlocks` map be internal to the function, rather than an in/out 
parameter?

(*) There are currently two callees: the top-level of VPlan consisting of the 
vector-loop-preheader - loop-region - middle-block, and the internal CFG of a 
region from its entry/header to its exit(ing)/latch.

https://github.com/llvm/llvm-project/pull/73158
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