[llvm] [LoopInterchange] Improve profitability check for vectorization (PR #133672)

[Michael Kruse via llvm-commits]

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@@ -119,7 +119,11 @@ static bool noDuplicateRules(ArrayRef<RuleTy> Rules) {
 
 static void printDepMatrix(CharMatrix &DepMatrix) {
   for (auto &Row : DepMatrix) {
-    for (auto D : Row)
+    ArrayRef<char> RowRef(Row);
+
+    // Drop the last element because it is a flag indicating whether the row is
+    // "lexically forward", which doesn't affect the legality check.
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Meinersbur wrote:

Can you add a comment somehwere, e.g. the typedef of `DepMatrix` that the last element is forward/backward dependency?

https://github.com/llvm/llvm-project/pull/133672