[llvm] [LoadStoreVectorizer] Propagate alignment through contiguous chain (PR #145733)

[Matt Arsenault via llvm-commits]

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@@ -0,0 +1,450 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
+; RUN: opt -passes=load-store-vectorizer -S < %s | FileCheck %s
+
+; The IR has the first float3 labeled with align 16, and that 16 should
+; be propagated such that the second set of 4 values
+; can also be vectorized together.
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arsenm wrote:

This has the align 16 with `opt -attributor-enable=module -O3`. The default attribute passes do a worse job it seems 

https://github.com/llvm/llvm-project/pull/145733