[all-commits] [llvm/llvm-project] d2e5d3: [StructurizeCFG] Clean up some boolean not instruc...

[Jay Foad via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: d2e5d3512be092af91a36d2e7d1884c786127950
      https://github.com/llvm/llvm-project/commit/d2e5d3512be092af91a36d2e7d1884c786127950
  Author: Jay Foad <jay.foad at amd.com>
  Date:   2022-02-01 (Tue, 01 Feb 2022)

  Changed paths:
    M llvm/lib/Transforms/Scalar/StructurizeCFG.cpp
    M llvm/test/CodeGen/AMDGPU/GlobalISel/divergent-control-flow.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/sdiv.i64.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/srem.i64.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/udiv.i64.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/urem.i64.ll
    M llvm/test/CodeGen/AMDGPU/branch-relaxation.ll
    M llvm/test/CodeGen/AMDGPU/ctpop16.ll
    M llvm/test/CodeGen/AMDGPU/insert_vector_elt.ll
    M llvm/test/CodeGen/AMDGPU/loop_break.ll
    M llvm/test/CodeGen/AMDGPU/multi-divergent-exit-region.ll
    M llvm/test/CodeGen/AMDGPU/multilevel-break.ll
    M llvm/test/CodeGen/AMDGPU/nested-loop-conditions.ll
    M llvm/test/CodeGen/AMDGPU/optimize-negated-cond.ll
    M llvm/test/CodeGen/AMDGPU/sgpr-control-flow.ll
    M llvm/test/CodeGen/AMDGPU/sgpr-copy.ll
    M llvm/test/Transforms/StructurizeCFG/AMDGPU/loop-subregion-misordered.ll
    M llvm/test/Transforms/StructurizeCFG/bug36015.ll
    M llvm/test/Transforms/StructurizeCFG/invert-constantexpr.ll
    M llvm/test/Transforms/StructurizeCFG/one-loop-multiple-backedges.ll
    M llvm/test/Transforms/StructurizeCFG/post-order-traversal-bug.ll

  Log Message:
  -----------
  [StructurizeCFG] Clean up some boolean not instructions

In some cases StructurizeCFG inserts i1 xor instructions to invert
predicates. Add a quick loop to clean these up afterwards if we can get
away with modifying an existing compare instruction instead.
(StructurizeCFG is generally run late in the pipeline so instcombine
does not clean them up for us.)

Differential Revision: https://reviews.llvm.org/D118623