[PATCH] D47511: [AMDGPU] Construct memory clauses before RA

[Stanislav Mekhanoshin via Phabricator via llvm-commits]

rampitec created this revision.
rampitec added reviewers: vpykhtin, arsenm.
Herald added subscribers: mgrang, javed.absar, t-tye, tpr, dstuttard, yaxunl, mgorny, nhaehnle, wdng, kzhuravl.

Memory clauses are formed into bundles in presence of xnack.
Their source operands are marked as early-clobber.
This allows to allocate distinct source and destination registers within a clause and prevent breaking the clause with s_nop in the hazard recognizer.
Clauses are undone before post-RA scheduler to allow some rescheduling, which will not break the clause since artificial edges are created in the dag to keep memory operations together. Yet this allows a better ILP in some cases.


https://reviews.llvm.org/D47511

Files:
  lib/Target/AMDGPU/AMDGPU.h
  lib/Target/AMDGPU/AMDGPUTargetMachine.cpp
  lib/Target/AMDGPU/CMakeLists.txt
  lib/Target/AMDGPU/GCNIterativeScheduler.cpp
  lib/Target/AMDGPU/GCNSchedStrategy.cpp
  lib/Target/AMDGPU/GCNSchedStrategy.h
  lib/Target/AMDGPU/SIFormMemoryClauses.cpp
  lib/Target/AMDGPU/SIISelLowering.cpp
  lib/Target/AMDGPU/SIInstrInfo.cpp
  lib/Target/AMDGPU/SIInstructions.td
  lib/Target/AMDGPU/SIMachineFunctionInfo.cpp
  lib/Target/AMDGPU/SIMachineFunctionInfo.h
  test/CodeGen/AMDGPU/memory_clause.ll
  test/CodeGen/AMDGPU/memory_clause.mir

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