[llvm] Imprecise switch case (PR #82795)

[Thomas Symalla via llvm-commits]

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@@ -5967,6 +5986,22 @@ static Value *foldSwitchToSelect(const SwitchCaseResultVectorTy &ResultVector,
   //   case 20: return 2;   ---->  %2 = icmp eq i32 %a, 20
   //   default: return 4;          %3 = select i1 %2, i32 2, i32 %1
   // }
+
+  if (IsComplexSwitchTransform) {
+    bool IsSizeOkay = true;
+
+    for (int i = 0; i < ResultVector.size(); i++)
+      if (ResultVector[i].second.size() != 1)
+        IsSizeOkay = false;
+
+    if (IsSizeOkay && ResultVector.size() > 2) {
+      Value *FinalSelect =
+          createSelectChain(Condition, DefaultResult, ResultVector, 0, Builder);
+      if (FinalSelect)
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tsymalla wrote:

`createSelectChain` always returns a non-`nullptr` value?

https://github.com/llvm/llvm-project/pull/82795