[clang] [libc] [clang-tools-extra] [compiler-rt] [flang] [llvm] [libcxx] [lld] [lldb] [VPlan] Implement cloning of VPlans. (PR #73158)

[via cfe-commits]

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@@ -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);
+
+static VPBlockBase *cloneVPB(VPBlockBase *BB) {
+  if (auto *VPBB = dyn_cast<VPBasicBlock>(BB)) {
+    auto *NewBlock = new VPBasicBlock(VPBB->getName());
+    for (VPRecipeBase &R : *VPBB)
+      NewBlock->appendRecipe(R.clone());
+    return NewBlock;
+  }
+
+  auto *VPR = cast<VPRegionBlock>(BB);
+  DenseMap<VPBlockBase *, VPBlockBase *> Old2NewVPBlocks;
+  DenseMap<VPValue *, VPValue *> Old2NewVPValues;
----------------
ayalz wrote:

Is `Old2NewVPValues` needed here?

Hopefully `Old2NewVPBlocks` will not be needed either, doing instead something like:
```
  auto [NewEntry, NewExiting] = cloneSESE(VPR->getEntry());
```


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