[all-commits] [llvm/llvm-project] 6a6cc5: [SimpleLoopUnswitch] Enable freezing of conditions...

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 6a6cc5542b614e040e88c30baa8c5fc7df169e17
      https://github.com/llvm/llvm-project/commit/6a6cc5542b614e040e88c30baa8c5fc7df169e17
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2022-04-25 (Mon, 25 Apr 2022)

  Changed paths:
    M llvm/lib/Transforms/Scalar/SimpleLoopUnswitch.cpp
    M llvm/test/Transforms/SimpleLoopUnswitch/ARM/nontrivial-unswitch-cost.ll
    M llvm/test/Transforms/SimpleLoopUnswitch/guards.ll
    M llvm/test/Transforms/SimpleLoopUnswitch/implicit-null-checks.ll
    M llvm/test/Transforms/SimpleLoopUnswitch/nontrivial-unswitch-cost.ll
    M llvm/test/Transforms/SimpleLoopUnswitch/nontrivial-unswitch.ll

  Log Message:
  -----------
  [SimpleLoopUnswitch] Enable freezing of conditions by default.

This fixes a series of mis-compiles by SimpleLoopUnswitch.

My measurements showed no performance regression with -O3 on AArch64
in SPEC2006, SPEC2017 and a set of internal benchmarks.

Fixes #50387, #50430

Depends on D124251.

Reviewed By: nikic, aqjune

Differential Revision: https://reviews.llvm.org/D124252