[llvm] [LAA] Avoid unprofitable unit-stride versioning (PR #225331)

[Ramkumar Ramachandra via llvm-commits]

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artagnon wrote:

Unfortunately, this routine is already broken, and we have to fix it first: https://github.com/llvm/llvm-project/pull/212816.

https://github.com/llvm/llvm-project/pull/225331