[all-commits] [llvm/llvm-project] 44d70d: [LoopUnroll] Eliminate PreserveOnlyFirst parameter...

[Philip Reames via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 44d70d298acc872f37819efcb101334674a289e9
      https://github.com/llvm/llvm-project/commit/44d70d298acc872f37819efcb101334674a289e9
  Author: Philip Reames <listmail at philipreames.com>
  Date:   2021-06-03 (Thu, 03 Jun 2021)

  Changed paths:
    M llvm/include/llvm/Transforms/Utils/UnrollLoop.h
    M llvm/lib/Transforms/Scalar/LoopUnrollPass.cpp
    M llvm/lib/Transforms/Utils/LoopUnroll.cpp
    M llvm/lib/Transforms/Utils/LoopUnrollRuntime.cpp

  Log Message:
  -----------
  [LoopUnroll] Eliminate PreserveOnlyFirst parameter [nfc]

This is a first step towards simplifying the transform interface to be less error prone. The basic idea is that querying SCEV is cheap (since it's cached) and we can just check for properties related to branch folding in the transform method instead of relying on the heuristic part to pass everything in correctly.

Differential Revision: https://reviews.llvm.org/D103584