[all-commits] [llvm/llvm-project] c435cd: [SimplifyCFG] Cache unique predecessors in `simpli...

[Antonio Frighetto via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: c435cd173059863b44262ace75e0f381bbc6cb86
      https://github.com/llvm/llvm-project/commit/c435cd173059863b44262ace75e0f381bbc6cb86
  Author: Antonio Frighetto <me at antoniofrighetto.com>
  Date:   2025-07-18 (Fri, 18 Jul 2025)

  Changed paths:
    M llvm/lib/Transforms/Utils/SimplifyCFG.cpp
    M llvm/test/Transforms/SimplifyCFG/switch-dup-bbs.ll
    M llvm/test/Transforms/SimplifyCFG/switch-range-to-icmp.ll

  Log Message:
  -----------
  [SimplifyCFG] Cache unique predecessors in `simplifyDuplicateSwitchArms`

Avoid repeatedly querying `getUniquePredecessor` for already-visited
switch successors so as not to incur quadratic runtime.

Fixes: https://github.com/llvm/llvm-project/issues/147239.



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