[all-commits] [llvm/llvm-project] 78739f: [DAG] Enable combineShiftOfShiftedLogic folds afte...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 78739fdb4d846c068ddd935d4cbd0474ff5fc6a9
      https://github.com/llvm/llvm-project/commit/78739fdb4d846c068ddd935d4cbd0474ff5fc6a9
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2022-10-29 (Sat, 29 Oct 2022)

  Changed paths:
    M llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
    M llvm/lib/Target/AMDGPU/AMDGPUISelLowering.cpp
    M llvm/lib/Target/AMDGPU/AMDGPUISelLowering.h
    M llvm/test/CodeGen/AMDGPU/cvt_f32_ubyte.ll
    M llvm/test/CodeGen/AMDGPU/fast-unaligned-load-store.global.ll
    M llvm/test/CodeGen/AMDGPU/fast-unaligned-load-store.private.ll
    M llvm/test/CodeGen/AMDGPU/idot8s.ll
    M llvm/test/CodeGen/AMDGPU/idot8u.ll
    M llvm/test/CodeGen/AMDGPU/insert_vector_dynelt.ll
    M llvm/test/CodeGen/AMDGPU/insert_vector_elt.ll
    M llvm/test/CodeGen/BPF/pr57872.ll
    M llvm/test/CodeGen/Mips/cconv/return-struct.ll
    M llvm/test/CodeGen/Mips/cconv/vector.ll
    M llvm/test/CodeGen/Mips/load-store-left-right.ll
    M llvm/test/CodeGen/Mips/unalignedload.ll
    M llvm/test/CodeGen/RISCV/bswap-bitreverse.ll
    M llvm/test/CodeGen/RISCV/rvv/fixed-vectors-unaligned.ll
    M llvm/test/CodeGen/RISCV/srem-seteq-illegal-types.ll
    M llvm/test/CodeGen/RISCV/unaligned-load-store.ll
    M llvm/test/CodeGen/SystemZ/store_nonbytesized_vecs.ll
    M llvm/test/CodeGen/Thumb/urem-seteq-illegal-types.ll
    M llvm/test/CodeGen/X86/bool-vector.ll
    M llvm/test/CodeGen/X86/combine-bitreverse.ll
    M llvm/test/CodeGen/X86/is_fpclass.ll
    M llvm/test/CodeGen/X86/vector-sext.ll

  Log Message:
  -----------
  [DAG] Enable combineShiftOfShiftedLogic folds after type legalization

This was disabled to prevent regressions, which appear to be just occurring on AMDGPU (at least in our current lit tests), which I've addressed by adding AMDGPUTargetLowering::isDesirableToCommuteWithShift overrides.

Fixes #57872

Differential Revision: https://reviews.llvm.org/D136042