[all-commits] [llvm/llvm-project] 9f1b6b: [LoopUnroll] Fix division by zero

[Joel E. Denny via All-commits]

  Branch: refs/heads/users/jdenny-ornl/unroll-fix-prob-one
  Home:   https://github.com/llvm/llvm-project
  Commit: 9f1b6b668c0d852ffe6847d5992a2d31f0e23dd3
      https://github.com/llvm/llvm-project/commit/9f1b6b668c0d852ffe6847d5992a2d31f0e23dd3
  Author: Joel E. Denny <jdenny.ornl at gmail.com>
  Date:   2025-11-03 (Mon, 03 Nov 2025)

  Changed paths:
    M llvm/lib/Transforms/Utils/LoopUnrollRuntime.cpp
    A llvm/test/Transforms/LoopUnroll/loop-probability-one.ll

  Log Message:
  -----------
  [LoopUnroll] Fix division by zero

PR #159163's probability computation for epilogue loops does not
handle the possibility of an original loop probability of one.
Runtime loop unrolling does not make sense for such an infinite loop,
and a division by zero results.  This patch works around that case.

Issue #165998.



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