[all-commits] [llvm/llvm-project] 5028de: [LAA] Only invalidate loops that require runtime c...

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 5028dea65266ab8b7f8f9ebd5d5e01faacebc645
      https://github.com/llvm/llvm-project/commit/5028dea65266ab8b7f8f9ebd5d5e01faacebc645
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2024-07-06 (Sat, 06 Jul 2024)

  Changed paths:
    M llvm/include/llvm/Analysis/LoopAccessAnalysis.h
    M llvm/lib/Analysis/LoopAccessAnalysis.cpp

  Log Message:
  -----------
  [LAA] Only invalidate loops that require runtime checks (NFCI).

LAA doesn't keep references to IR outside the loop or references to
SCEVs that may be invalidated, unless runtime checks are needed (either
memory or SCEV predicates). For the current LAA users, it should be
sufficient to invalidate entries for loops that require runtime checks,
thus avoiding analyzing loops again unnecessarily.

This helps reduce compile-time, in particular when removing the
restrictions added in 234cc40adc6.

https://llvm-compile-time-tracker.com/compare.php?from=73894dba2cdbcc00678d0c13a6b61765675f60b4&to=05c6bdc41b5f63696ebeb7116325725fa94f66d6&stat=instructions:u



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