[all-commits] [llvm/llvm-project] 190063: [MC] Speed up checkFeatures() (NFCI) (#130936)

[Nikita Popov via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 190063464e12d730eef27873ce985e15a5eeee0b
      https://github.com/llvm/llvm-project/commit/190063464e12d730eef27873ce985e15a5eeee0b
  Author: Nikita Popov <npopov at redhat.com>
  Date:   2025-03-12 (Wed, 12 Mar 2025)

  Changed paths:
    M llvm/lib/MC/MCSubtargetInfo.cpp

  Log Message:
  -----------
  [MC] Speed up checkFeatures() (NFCI) (#130936)

checkFeatures() currently goes through ApplyFeatureFlag(), which will
also handle implied features. This is very slow -- just querying every
feature once takes up 10% of a Rust hello world compile.

However, if we only want to query whether certain features are
set/unset, we can do so directly -- implied features have already been
handled when the FeatureBitset was constructed.



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