[all-commits] [llvm/llvm-project] a4573e: [LoopUnroll] UnrollRuntimeMultiExit takes preceden...

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: a4573ee38d4497749d06aedb422159277cccfd66
      https://github.com/llvm/llvm-project/commit/a4573ee38d4497749d06aedb422159277cccfd66
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2025-04-04 (Fri, 04 Apr 2025)

  Changed paths:
    M llvm/lib/Transforms/Utils/LoopUnrollRuntime.cpp
    M llvm/test/Transforms/LoopUnroll/AArch64/apple-unrolling-multi-exit.ll

  Log Message:
  -----------
  [LoopUnroll] UnrollRuntimeMultiExit takes precedence over TTI. (#134259)

Update UnrollRuntimeLoopRemainder to always give priority to the
UnrollRuntimeMultiExit option, if provided.

After ad9da92cf6f7357 (https://github.com/llvm/llvm-project/pull/124462),
we would ignore the option if the backend indicates multi-exit is profitable.
This means it cannot be used to disable runtime unrolling.

To be consistent with canProfitablyRuntimeUnrollMultiExitLoop, always
respect the option.

This surfaced while discussing https://github.com/llvm/llvm-project/pull/131998.

PR: https://github.com/llvm/llvm-project/pull/134259



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