[all-commits] [llvm/llvm-project] b20f2d: [MachineSink] Lower SplitEdgeProbabilityThreshold

[Guy David via All-commits]

  Branch: refs/heads/users/guy-david/machine-sink
  Home:   https://github.com/llvm/llvm-project
  Commit: b20f2dc6ce822e3345415caacba82c3c8ca416c7
      https://github.com/llvm/llvm-project/commit/b20f2dc6ce822e3345415caacba82c3c8ca416c7
  Author: Guy David <guyda96 at gmail.com>
  Date:   2025-02-18 (Tue, 18 Feb 2025)

  Changed paths:
    M llvm/lib/CodeGen/MachineSink.cpp

  Log Message:
  -----------
  [MachineSink] Lower SplitEdgeProbabilityThreshold

Lower it slightly below the likeliness of a null-check to be true which
is set to 37.5% (see PtrUntakenProb).
Otherwise, it will split the edge and create another basic-block and
with an unconditional branch which might make the CFG more complex and
with a suboptimal block placement.
Note that if multiple instructions can be sinked from the same edge then
a split will occur regardless of this change.



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