[compiler-rt] Bfi precision (PR #66285)

Duncan P. N. Exon Smith via llvm-commits llvm-commits at lists.llvm.org
Thu Oct 26 11:59:18 PDT 2023


dexonsmith wrote:

Not entirely accidental. When BPI/BFI first landed it was heavily profiled to be sure it didn't pessimize non-PGO code. I don't see why we'd suddenly be okay with pessimizing it.

Under 2% isn't hard to hit for hot path code. Lots of functions will have strings of early exit conditions.

https://github.com/llvm/llvm-project/pull/66285


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