[llvm-bugs] [Bug 45015] [X86][AVX] Failure to generate vaddsubps for pattern after 19b62b79

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=45015

Sanjay Patel <spatel+llvm at rotateright.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
 Fixed By Commit(s)|                            |10ea01d80d6f, 71a316883d50
         Resolution|---                         |FIXED
             Status|NEW                         |RESOLVED

--- Comment #6 from Sanjay Patel <spatel+llvm at rotateright.com> ---
The IR is restored to minimal with the addition of an early-cse pass to the
optimizer pipeline:
https://reviews.llvm.org/D75145 ( https://reviews.llvm.org/rG71a316883d50 )

(and that patch includes phase-ordering tests, so hopefully we can detect cases
like this more easily)

We didn't need any extra shuffle combines to get this particular example
because instcombine has the ability to reduce these already.

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