[all-commits] [llvm/llvm-project] 692437: [AMDGPU] Disable generic DAG combines at -O0 to pr...

Daniil Fukalov via All-commits all-commits at lists.llvm.org
Thu Feb 12 07:13:23 PST 2026 

  Branch: refs/heads/users/dfukalov/avoid_dag_combine_O0
  Home:   https://github.com/llvm/llvm-project
  Commit: 692437249a8558ee2df9d433d733e4ad096697e1
      https://github.com/llvm/llvm-project/commit/692437249a8558ee2df9d433d733e4ad096697e1
  Author: Daniil Fukalov <dfukalov at gmail.com>
  Date:   2026-02-11 (Wed, 11 Feb 2026)

  Changed paths:
    M llvm/include/llvm/CodeGen/TargetLowering.h
    M llvm/lib/Target/AMDGPU/AMDGPUISelLowering.cpp
    M llvm/lib/Target/AMDGPU/AMDGPUISelLowering.h
    M llvm/lib/Target/AMDGPU/AMDGPUSelectionDAGInfo.h
    M llvm/test/CodeGen/AMDGPU/atomicrmw-expand.ll
    M llvm/test/CodeGen/AMDGPU/basic-branch.ll
    M llvm/test/CodeGen/AMDGPU/bb-prolog-spill-during-regalloc.ll
    M llvm/test/CodeGen/AMDGPU/cf-loop-on-constant.ll
    M llvm/test/CodeGen/AMDGPU/collapse-endcf.ll
    M llvm/test/CodeGen/AMDGPU/control-flow-fastregalloc.ll
    M llvm/test/CodeGen/AMDGPU/dagcombine-lshr-and-cmp.ll
    M llvm/test/CodeGen/AMDGPU/extract_vector_dynelt.ll
    M llvm/test/CodeGen/AMDGPU/flat-scratch-alloca-issue-155902.ll
    M llvm/test/CodeGen/AMDGPU/indirect-addressing-si.ll
    M llvm/test/CodeGen/AMDGPU/indirect-addressing-term.ll
    M llvm/test/CodeGen/AMDGPU/insert-delay-alu-bug.ll
    M llvm/test/CodeGen/AMDGPU/insert_vector_dynelt.ll
    M llvm/test/CodeGen/AMDGPU/kernel-vgpr-spill-mubuf-with-voffset.ll
    M llvm/test/CodeGen/AMDGPU/llvm.amdgcn.ds.gws.barrier-fastregalloc.ll
    M llvm/test/CodeGen/AMDGPU/llvm.amdgcn.update.dpp.ll
    M llvm/test/CodeGen/AMDGPU/llvm.dbg.value.ll
    M llvm/test/CodeGen/AMDGPU/load-global-invariant.ll
    M llvm/test/CodeGen/AMDGPU/memory-legalizer-flat-agent.ll
    M llvm/test/CodeGen/AMDGPU/memory-legalizer-flat-cluster.ll
    M llvm/test/CodeGen/AMDGPU/memory-legalizer-flat-lastuse.ll
    M llvm/test/CodeGen/AMDGPU/memory-legalizer-flat-nontemporal.ll
    M llvm/test/CodeGen/AMDGPU/memory-legalizer-flat-singlethread.ll
    M llvm/test/CodeGen/AMDGPU/memory-legalizer-flat-system.ll
    M llvm/test/CodeGen/AMDGPU/memory-legalizer-flat-volatile.ll
    M llvm/test/CodeGen/AMDGPU/memory-legalizer-flat-wavefront.ll
    M llvm/test/CodeGen/AMDGPU/memory-legalizer-flat-workgroup.ll
    M llvm/test/CodeGen/AMDGPU/memory-legalizer-global-agent.ll
    M llvm/test/CodeGen/AMDGPU/memory-legalizer-global-cluster.ll
    M llvm/test/CodeGen/AMDGPU/memory-legalizer-global-lastuse.ll
    M llvm/test/CodeGen/AMDGPU/memory-legalizer-global-nontemporal.ll
    M llvm/test/CodeGen/AMDGPU/memory-legalizer-global-singlethread.ll
    M llvm/test/CodeGen/AMDGPU/memory-legalizer-global-system.ll
    M llvm/test/CodeGen/AMDGPU/memory-legalizer-global-volatile.ll
    M llvm/test/CodeGen/AMDGPU/memory-legalizer-global-wavefront.ll
    M llvm/test/CodeGen/AMDGPU/memory-legalizer-global-workgroup.ll
    M llvm/test/CodeGen/AMDGPU/memory-legalizer-local-agent.ll
    M llvm/test/CodeGen/AMDGPU/memory-legalizer-local-cluster.ll
    M llvm/test/CodeGen/AMDGPU/memory-legalizer-local-nontemporal.ll
    M llvm/test/CodeGen/AMDGPU/memory-legalizer-local-singlethread.ll
    M llvm/test/CodeGen/AMDGPU/memory-legalizer-local-system.ll
    M llvm/test/CodeGen/AMDGPU/memory-legalizer-local-volatile.ll
    M llvm/test/CodeGen/AMDGPU/memory-legalizer-local-wavefront.ll
    M llvm/test/CodeGen/AMDGPU/memory-legalizer-local-workgroup.ll
    M llvm/test/CodeGen/AMDGPU/memory-legalizer-private-agent.ll
    M llvm/test/CodeGen/AMDGPU/memory-legalizer-private-cluster.ll
    M llvm/test/CodeGen/AMDGPU/memory-legalizer-private-lastuse.ll
    M llvm/test/CodeGen/AMDGPU/memory-legalizer-private-nontemporal.ll
    M llvm/test/CodeGen/AMDGPU/memory-legalizer-private-singlethread.ll
    M llvm/test/CodeGen/AMDGPU/memory-legalizer-private-system.ll
    M llvm/test/CodeGen/AMDGPU/memory-legalizer-private-volatile.ll
    M llvm/test/CodeGen/AMDGPU/memory-legalizer-private-wavefront.ll
    M llvm/test/CodeGen/AMDGPU/memory-legalizer-private-workgroup.ll
    M llvm/test/CodeGen/AMDGPU/partial-sgpr-to-vgpr-spills.ll
    M llvm/test/CodeGen/AMDGPU/rewrite-vgpr-mfma-to-agpr.ll
    M llvm/test/CodeGen/AMDGPU/scalar_to_vector_v2x16.ll
    M llvm/test/CodeGen/AMDGPU/select-phi-s16-fp.ll
    M llvm/test/CodeGen/AMDGPU/sgpr-spill-no-vgprs.ll
    M llvm/test/CodeGen/AMDGPU/sgpr-spills-split-regalloc.ll
    M llvm/test/CodeGen/AMDGPU/smfmac_alloc_failure_no_agpr_O0.ll
    M llvm/test/CodeGen/AMDGPU/sopk-no-literal.ll
    M llvm/test/CodeGen/AMDGPU/spill-m0.ll
    M llvm/test/CodeGen/AMDGPU/spill-vgpr-to-agpr-update-regscavenger.ll
    M llvm/test/CodeGen/AMDGPU/spill-wide-sgpr.ll
    M llvm/test/CodeGen/AMDGPU/stacksave_stackrestore.ll
    M llvm/test/CodeGen/AMDGPU/trap-abis.ll
    M llvm/test/CodeGen/AMDGPU/vgpr-limit-gfx1250.ll
    M llvm/test/CodeGen/AMDGPU/vgpr-spill-placement-issue61083.ll
    M llvm/test/CodeGen/AMDGPU/vgpr_constant_to_sgpr.ll
    M llvm/test/CodeGen/AMDGPU/wwm-reserved-spill.ll
    M llvm/test/CodeGen/AMDGPU/wwm-reserved.ll
    M llvm/test/CodeGen/AMDGPU/zext-lid.ll

  Log Message:
  -----------
  [AMDGPU] Disable generic DAG combines at -O0 to preserve debuggability.

Disable generic DAG combines for AMDGPU at -O0 via disableGenericCombines()
to preserve instructions that users may want to set breakpoints
on during debugging.

Since power-of-2 division/remainder for types > i64 was dependent on
DAG combine optimizations, added shouldExpandPowerOf2DivRem()
to request IR-level expansion for these cases at -O0.


  Commit: d643dafa3a316efbcc2efb91f175e40cdb9844ec
      https://github.com/llvm/llvm-project/commit/d643dafa3a316efbcc2efb91f175e40cdb9844ec
  Author: Daniil Fukalov <dfukalov at gmail.com>
  Date:   2026-02-11 (Wed, 11 Feb 2026)

  Changed paths:
    M clang/test/CodeGenCUDA/fp-contract.cu

  Log Message:
  -----------
  Fixed test, addressed comment.


  Commit: ea48cdb0a8261b11abc3633822d8269af8699be7
      https://github.com/llvm/llvm-project/commit/ea48cdb0a8261b11abc3633822d8269af8699be7
  Author: Daniil Fukalov <dfukalov at gmail.com>
  Date:   2026-02-11 (Wed, 11 Feb 2026)

  Changed paths:
    M llvm/include/llvm/CodeGen/TargetLowering.h
    M llvm/lib/Target/AMDGPU/AMDGPUISelLowering.cpp
    M llvm/lib/Target/AMDGPU/AMDGPUISelLowering.h
    M llvm/test/CodeGen/AMDGPU/div_i128.ll
    M llvm/test/CodeGen/AMDGPU/rem_i128.ll
    M llvm/test/CodeGen/AMDGPU/select-phi-s16-fp.ll
    M llvm/test/CodeGen/AMDGPU/wait-xcnt-atomic-rmw-optimization.ll

  Log Message:
  -----------
  Removed shouldExpandPowerOf2DivRem, rebased, fixed conflicts


Compare: https://github.com/llvm/llvm-project/compare/2b41bc8fc08b...ea48cdb0a826

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