[all-commits] [llvm/llvm-project] 60325a: [MLGO] Add Threshold to Prevent Pathological Compi...

[Aiden Grossman via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 60325abeb3226b17c28429dfa6e175f25c171ec0
      https://github.com/llvm/llvm-project/commit/60325abeb3226b17c28429dfa6e175f25c171ec0
  Author: Aiden Grossman <aidengrossman at google.com>
  Date:   2024-12-12 (Thu, 12 Dec 2024)

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

  Log Message:
  -----------
  [MLGO] Add Threshold to Prevent Pathological Compile Time Cases (#119807)

This patch adds a threshold flag, -mlregalloc-max-cascade, to prevent
live ranges from being evicted more than is necessary.

After deploying a new regalloc model, we ran into some pathological
cases where the model decided it wanted to ping-pong evictions, taking
up a large amount of compile time. This threshold is mostly a stop gap
while we continue to investigate other solutions and work on
minimizing/constructing test cases.



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