[llvm] [LV] Rewrite UDiv A, B -> UDiv A, UMax(B, 1) in trip counts if needed. (PR #92177)

[Eli Friedman via llvm-commits]

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@@ -4304,12 +4304,19 @@ ScalarEvolution::getSequentialMinMaxExpr(SCEVTypes Kind,
   }
 
   for (unsigned i = 1, e = Ops.size(); i != e; ++i) {
+    bool MayBeUB = SCEVExprContains(Ops[i], [](const SCEV *S) {
+      auto *UDiv = dyn_cast<SCEVUDivExpr>(S);
+      return UDiv && !isa<SCEVConstant>(UDiv->getOperand(1));
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efriedma-quic wrote:

Need to check for zero constant, I think.

https://github.com/llvm/llvm-project/pull/92177