[llvm] [VPlan] Build initial VPlan 0 using HCFGBuilder for inner loops. (NFC) (PR #124432)

[via llvm-commits]

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@@ -308,6 +308,14 @@ void PlainCFGBuilder::createVPInstructionsForVPBB(VPBasicBlock *VPBB,
       continue;
     }
 
+    if (auto *SI = dyn_cast<SwitchInst>(Inst)) {
+      SmallVector<VPValue *> Ops = {getOrCreateVPOperand(SI->getCondition())};
+      for (auto Case : SI->cases())
+        Ops.push_back(getOrCreateVPOperand(Case.getCaseValue()));
+      VPIRBuilder.createNaryOp(Instruction::Switch, Ops, Inst);
+      continue;
+    }
+
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ayalz wrote:

Teaching PlainCFGBuilder about switch statements - does this imply that "native" can now vectorize outerloops with switches, and worth testing?

https://github.com/llvm/llvm-project/pull/124432