[llvm] [LoadStoreVectorizer] Fill gaps in load/store chains to enable vectorization (PR #159388)

[Akshay Deodhar via llvm-commits]

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@@ -623,6 +663,25 @@ std::vector<Chain> Vectorizer::splitChainByContiguity(Chain &C) {
     dumpChain(C);
   });
 
+  // If the chain is not contiguous, we try to fill the gap with "extra"
+  // elements to artificially make it contiguous, to try to enable
+  // vectorization. We only fill gaps if there is a potentially legal masked
+  // load/store for the target. If later on, we don't end up with a chain that
+  // could be vectorized into a legal masked load/store, the chains with extra
+  // elements will be filtered out in splitChainByAlignment.
+  bool TryFillGaps = shouldAttemptMaskedLoadStore(C);
+
+  unsigned ASPtrBits =
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akshayrdeodhar wrote:

Makes sense. 

https://github.com/llvm/llvm-project/pull/159388