[llvm] Users/xiangzhangllvm/loop unroll folding branches (PR #74703)

[Nikita Popov via llvm-commits]

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@@ -776,6 +776,11 @@ shouldPragmaUnroll(Loop *L, const PragmaInfo &PInfo,
   if (PInfo.PragmaFullUnroll && TripCount != 0)
     return TripCount;
 
+  // Small MaxTripCount is clearly calculated with "pragma unroll".
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nikic wrote:

Ah, I get what you mean now. It would probably be okay to use a higher limit than UnrollMaxUpperBound if pragma is involved, but I agree that simply unrolling to any MaxTripCount would not be safe.

https://github.com/llvm/llvm-project/pull/74703