[all-commits] [llvm/llvm-project] aaaf0e: [VectorCombine] loosen alignment constraint for lo...

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  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: aaaf0ec72b062dea09a277e5b9e6bda0a3da55c9
      https://github.com/llvm/llvm-project/commit/aaaf0ec72b062dea09a277e5b9e6bda0a3da55c9
  Author: Sanjay Patel <spatel at rotateright.com>
  Date:   2020-12-16 (Wed, 16 Dec 2020)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/VectorCombine.cpp
    M llvm/test/Transforms/VectorCombine/X86/load.ll

  Log Message:
  -----------
  [VectorCombine] loosen alignment constraint for load transform

As discussed in D93229, we only need a minimal alignment constraint
when querying whether a hypothetical vector load is safe. We still
pass/use the potentially stronger alignment attribute when checking
costs and creating the new load.

There's already a test that changes with the minimum code change,
so splitting this off as a preliminary commit independent of any
gep/offset enhancements.

Differential Revision: https://reviews.llvm.org/D93397