[all-commits] [llvm/llvm-project] 84a3be: [SimplifyCFG] performBranchToCommonDestFolding(): ...

[Roman Lebedev via All-commits]

  Branch: refs/heads/release/13.x
  Home:   https://github.com/llvm/llvm-project
  Commit: 84a3be829686268ce033b034bfa5f2c9d1a83b60
      https://github.com/llvm/llvm-project/commit/84a3be829686268ce033b034bfa5f2c9d1a83b60
  Author: Roman Lebedev <lebedev.ri at gmail.com>
  Date:   2021-09-10 (Fri, 10 Sep 2021)

  Changed paths:
    M llvm/lib/Transforms/Utils/SimplifyCFG.cpp
    M llvm/test/CodeGen/Thumb2/mve-float16regloops.ll
    M llvm/test/CodeGen/Thumb2/mve-float32regloops.ll
    M llvm/test/CodeGen/Thumb2/mve-postinc-lsr.ll
    M llvm/test/Transforms/LoopUnroll/peel-loop-inner.ll
    M llvm/test/Transforms/PhaseOrdering/X86/vector-reductions-logical.ll
    M llvm/test/Transforms/SimplifyCFG/fold-branch-to-common-dest.ll

  Log Message:
  -----------
  [SimplifyCFG] performBranchToCommonDestFolding(): require block-closed SSA form for bonus instructions (PR51125)

I can't seem to wrap my head around the proper fix here,
we should be fine without this requirement, iff we can form this form,
but the naive attempt (https://reviews.llvm.org/D106317) has failed.
So just to unblock the release, put up a restriction.

Fixes https://bugs.llvm.org/show_bug.cgi?id=51125

(cherry picked from commit 909cba969981032c5740774ca84a34b7f76b909b)