[llvm] [LV] Add initial legality checks for loops with unbound loads. (PR #152422)

[Luke Lau via llvm-commits]

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@@ -445,6 +445,11 @@ class LoopVectorizationLegality {
   /// Returns a list of all known histogram operations in the loop.
   bool hasHistograms() const { return !Histograms.empty(); }
 
+  /// Returns the loads that need to be fault-only-first.
+  const SmallPtrSetImpl<const Instruction *> &getFaultOnlyFirstLoads() const {
+    return FaultOnlyFirstLoads;
+  }
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lukel97 wrote:

Would `getFaultingLoads` be an accurate description? Loads that may fault due to not being deferenceable or alignment and so need to be handled via fault-only-first instructions. They may be non-unit strided in future.

https://github.com/llvm/llvm-project/pull/152422