[llvm] [LV] Vectorization of compress idiom (PR #83467)

[Alexey Bataev via llvm-commits]

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@@ -346,6 +386,13 @@ class LoopVectorizationLegality {
   /// loop. Do not use after invoking 'createVectorizedLoopSkeleton' (PR34965).
   int isConsecutivePtr(Type *AccessTy, Value *Ptr) const;
 
+  /// Returns true if \p Ptr is depends on a monotonic value and ptr diff
+  /// between two iterations is one if monotonic value is updated
+  bool isConsecutiveMonotonicPtr(Value *Ptr) const;
+
+  /// Return true if \p Ptr computation depends on monotonic value.
+  bool ptrHasMonotonicOperand(Value *Ptr) const;
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alexey-bataev wrote:

```suggestion
  bool hasMonotonicOperand(Value *Ptr) const;
```

https://github.com/llvm/llvm-project/pull/83467