[all-commits] [llvm/llvm-project] a6b54d: [Local] invertCondition: try modifying an existing...

[Jay Foad via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: a6b54ddaba2d5dc0f72dcc4591c92b9544eb0016
      https://github.com/llvm/llvm-project/commit/a6b54ddaba2d5dc0f72dcc4591c92b9544eb0016
  Author: Jay Foad <jay.foad at amd.com>
  Date:   2022-01-31 (Mon, 31 Jan 2022)

  Changed paths:
    M llvm/lib/Transforms/Utils/Local.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/ret_jump.ll
    M llvm/test/CodeGen/AMDGPU/sgpr-control-flow.ll
    M llvm/test/CodeGen/AMDGPU/sgpr-copy.ll
    M llvm/test/CodeGen/AMDGPU/wave32.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:
  -----------
  [Local] invertCondition: try modifying an existing ICmpInst

This avoids various cases where StructurizeCFG would otherwise insert an
xor i1 instruction, and it since it generally runs late in the pipeline,
instcombine does not clean up the xor-of-cmp pattern.

Differential Revision: https://reviews.llvm.org/D118478