================
@@ -7695,6 +7695,11 @@ static bool isGuaranteedNotToBeUndefOrPoison(
         }
         if (IsWellDefined)
           return true;
+      } else if (auto *Splat = isa<ShuffleVectorInst>(Opr) ? getSplatValue(Opr)
----------------
nikic wrote:

The precise rules for determining the result type of a ternary operator are 
exceedingly complicated, but the tl;dr is that nullptr is of type nullptr_t, 
which implicitly converts to all pointer types, and that's what makes this work.

https://github.com/llvm/llvm-project/pull/163570
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