[llvm] [VPlan] Add VPIRBasicBlock, use to model pre-preheader. (PR #93398)

[Florian Hahn via llvm-commits]

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@@ -442,6 +442,58 @@ VPBasicBlock::createEmptyBasicBlock(VPTransformState::CFGState &CFG) {
   return NewBB;
 }
 
+void VPIRWrapperBlock::execute(VPTransformState *State) {
+  for (VPBlockBase *PredVPBlock : getHierarchicalPredecessors()) {
+    VPBasicBlock *PredVPBB = PredVPBlock->getExitingBasicBlock();
+    auto &PredVPSuccessors = PredVPBB->getHierarchicalSuccessors();
+    BasicBlock *PredBB = State->CFG.VPBB2IRBB[PredVPBB];
+
+    assert(PredBB && "Predecessor basic-block not found building successor.");
+    auto *PredBBTerminator = PredBB->getTerminator();
+    LLVM_DEBUG(dbgs() << "LV: draw edge from" << PredBB->getName() << '\n');
+
+    auto *TermBr = dyn_cast<BranchInst>(PredBBTerminator);
+    if (TermBr) {
+      // Set each forward successor here when it is created, excluding
+      // backedges. A backward successor is set when the branch is created.
+      unsigned idx = PredVPSuccessors.front() == this ? 0 : 1;
+      assert(!TermBr->getSuccessor(idx) &&
+             "Trying to reset an existing successor block.");
+      TermBr->setSuccessor(idx, WrappedBlock);
+    }
+  }
+
+  assert(getHierarchicalSuccessors().size() == 0 &&
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fhahn wrote:

done, thanks!

https://github.com/llvm/llvm-project/pull/93398