[llvm] [X86] Add TuningSlowPDEP/PEXT flags and control vector PDEP/PEXT scalarization with them (PR #218980)

Rohan Shenoy via llvm-commits llvm-commits at lists.llvm.org
Thu Aug 27 04:57:10 PDT 2026

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222rohan wrote:

OK with me - running on Zen+/2 hardware confirms scalar sequence is _very_ slow compared to its vector expansion.

https://github.com/llvm/llvm-project/pull/218980

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