[llvm] [DependenceAnalysis] Extending SIV to handle fusable loops (PR #128782)

[Ryotaro Kasuga via llvm-commits]

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@@ -144,12 +154,25 @@ class LLVM_ABI Dependence {
   /// source and destination of the dependence.
   virtual unsigned getLevels() const { return 0; }
 
-  /// getDirection - Returns the direction associated with a particular level.
-  virtual unsigned getDirection(unsigned Level) const { return DVEntry::ALL; }
+  /// getSameSDLevels - Returns the number of separate SameSD loops surrounding
+  /// the source and destination of the dependence.
+  virtual unsigned getSameSDLevels() const { return 0; }
 
-  /// getDistance - Returns the distance (or NULL) associated with a particular
-  /// level.
-  virtual const SCEV *getDistance(unsigned Level) const { return nullptr; }
+  /// getDVEntry - Returns the DV entry associated with a regular or a
+  /// SameSD level
+  DVEntry getDVEntry(unsigned Level, bool isSameSD) const;
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kasuga-fj wrote:

Variable names should be camel case so it should be start with an upper-case letter.

https://github.com/llvm/llvm-project/pull/128782