[llvm] [AArch64] isTBLMask(M, VT) as part of the shuffle mask check (PR #79058)

[David Green via llvm-commits]

davemgreen wrote:

I am personally very skeptical that this is the right way to go. Whilst tbl instructions might be "cheap", a constpool + global lookup + load + tbl isn't, and we shouldn't be blindly optimizing towards using them.

You can't just run update_llc_test_checks on all the tests either.

https://github.com/llvm/llvm-project/pull/79058