[all-commits] [llvm/llvm-project] 2e6deb: [LoopInterchange] Fix overflow in cost calculation...

[Sjoerd Meijer via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 2e6deb1dd3a4422807633ba08773e8d786e43d4c
      https://github.com/llvm/llvm-project/commit/2e6deb1dd3a4422807633ba08773e8d786e43d4c
  Author: Sjoerd Meijer <smeijer at nvidia.com>
  Date:   2024-11-14 (Thu, 14 Nov 2024)

  Changed paths:
    M llvm/include/llvm/Analysis/LoopCacheAnalysis.h
    M llvm/lib/Analysis/LoopCacheAnalysis.cpp
    A llvm/test/Analysis/LoopCacheAnalysis/interchange-refcost-overflow.ll

  Log Message:
  -----------
  [LoopInterchange] Fix overflow in cost calculation (#111807)

If the iteration count is really large, e.g. UINT_MAX, then the cost
calculation can overflows and trigger an assert. So saturate the cost to
INT_MAX if this is the case by using InstructionCost as a type which
already supports this kind of overflow handling.

This fixes #104761



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