[all-commits] [llvm/llvm-project] 8c7550: [AMDGPU] Unused sdst writing to null (#133229)

[Ana Mihajlovic via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 8c7550132f410766598ba88de6b7e7a2a4607f67
      https://github.com/llvm/llvm-project/commit/8c7550132f410766598ba88de6b7e7a2a4607f67
  Author: Ana Mihajlovic <Ana.Mihajlovic at amd.com>
  Date:   2025-03-28 (Fri, 28 Mar 2025)

  Changed paths:
    M llvm/lib/Target/AMDGPU/SIShrinkInstructions.cpp
    M llvm/test/CodeGen/AMDGPU/GlobalISel/addsubu64.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/atomicrmw_udec_wrap.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/atomicrmw_uinc_wrap.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/extractelement-stack-lower.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/extractelement.i128.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/extractelement.i16.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/extractelement.i8.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/llvm.amdgcn.global.atomic.csub.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/llvm.amdgcn.intersect_ray.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/mubuf-global.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/mul.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/saddsat.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/shl-ext-reduce.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/ssubsat.ll
    M llvm/test/CodeGen/AMDGPU/amdgcn.bitcast.ll
    M llvm/test/CodeGen/AMDGPU/atomic_optimizations_global_pointer.ll
    M llvm/test/CodeGen/AMDGPU/atomic_optimizations_local_pointer.ll
    M llvm/test/CodeGen/AMDGPU/bf16.ll
    M llvm/test/CodeGen/AMDGPU/carryout-selection.ll
    M llvm/test/CodeGen/AMDGPU/cgp-addressing-modes-flat.ll
    M llvm/test/CodeGen/AMDGPU/div-rem-by-constant-64.ll
    M llvm/test/CodeGen/AMDGPU/dpp64_combine.ll
    M llvm/test/CodeGen/AMDGPU/flat-atomicrmw-fadd.ll
    M llvm/test/CodeGen/AMDGPU/flat-atomicrmw-fmax.ll
    M llvm/test/CodeGen/AMDGPU/flat-atomicrmw-fmin.ll
    M llvm/test/CodeGen/AMDGPU/flat-atomicrmw-fsub.ll
    M llvm/test/CodeGen/AMDGPU/flat_atomics_i64.ll
    M llvm/test/CodeGen/AMDGPU/fneg-combines.f16.ll
    M llvm/test/CodeGen/AMDGPU/fold-gep-offset.ll
    M llvm/test/CodeGen/AMDGPU/fold-int-pow2-with-fmul-or-fdiv.ll
    M llvm/test/CodeGen/AMDGPU/gfx10-vop-literal.ll
    M llvm/test/CodeGen/AMDGPU/gfx12_scalar_subword_loads.ll
    M llvm/test/CodeGen/AMDGPU/global-atomicrmw-fadd.ll
    M llvm/test/CodeGen/AMDGPU/global-atomicrmw-fmax.ll
    M llvm/test/CodeGen/AMDGPU/global-atomicrmw-fmin.ll
    M llvm/test/CodeGen/AMDGPU/global-atomicrmw-fsub.ll
    M llvm/test/CodeGen/AMDGPU/global-saddr-load.ll
    M llvm/test/CodeGen/AMDGPU/idiv-licm.ll
    M llvm/test/CodeGen/AMDGPU/integer-mad-patterns.ll
    M llvm/test/CodeGen/AMDGPU/llvm.amdgcn.intersect_ray.ll
    M llvm/test/CodeGen/AMDGPU/llvm.amdgcn.s.barrier.ll
    M llvm/test/CodeGen/AMDGPU/llvm.amdgcn.s.prefetch.data.ll
    M llvm/test/CodeGen/AMDGPU/llvm.mulo.ll
    M llvm/test/CodeGen/AMDGPU/load-constant-always-uniform.ll
    M llvm/test/CodeGen/AMDGPU/lrint.ll
    M llvm/test/CodeGen/AMDGPU/lround.ll
    M llvm/test/CodeGen/AMDGPU/machine-sink-temporal-divergence-swdev407790.ll
    M llvm/test/CodeGen/AMDGPU/mad_64_32.ll
    M llvm/test/CodeGen/AMDGPU/match-perm-extract-vector-elt-bug.ll
    M llvm/test/CodeGen/AMDGPU/memintrinsic-unroll.ll
    M llvm/test/CodeGen/AMDGPU/memmove-var-size.ll
    M llvm/test/CodeGen/AMDGPU/mul.ll
    M llvm/test/CodeGen/AMDGPU/offset-split-flat.ll
    M llvm/test/CodeGen/AMDGPU/offset-split-global.ll
    M llvm/test/CodeGen/AMDGPU/promote-constOffset-to-imm.ll
    M llvm/test/CodeGen/AMDGPU/reassoc-mul-add-1-to-mad.ll
    M llvm/test/CodeGen/AMDGPU/saddo.ll
    M llvm/test/CodeGen/AMDGPU/saddsat.ll
    M llvm/test/CodeGen/AMDGPU/shl_add_ptr_csub.ll
    M llvm/test/CodeGen/AMDGPU/spill-scavenge-offset.ll
    M llvm/test/CodeGen/AMDGPU/ssubsat.ll
    M llvm/test/CodeGen/AMDGPU/sub.ll
    M llvm/test/CodeGen/AMDGPU/uaddsat.ll
    M llvm/test/CodeGen/AMDGPU/udiv.ll
    M llvm/test/CodeGen/AMDGPU/usubsat.ll
    M llvm/test/CodeGen/AMDGPU/vector-reduce-add.ll
    M llvm/test/CodeGen/AMDGPU/vgpr-mark-last-scratch-load.ll

  Log Message:
  -----------
  [AMDGPU] Unused sdst writing to null (#133229)

Unused sdst writing to null to avoid a false VALU->SALU dependency
stall. This requires using the VOP3 encoding.



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