[all-commits] [llvm/llvm-project] 8d0412: [AMDGPU] Add pass to rewrite partially used virtua...

[Valery via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 8d0412ce9d48d80db548d100b3eded19993248f6
      https://github.com/llvm/llvm-project/commit/8d0412ce9d48d80db548d100b3eded19993248f6
  Author: Valery Pykhtin <valery.pykhtin at gmail.com>
  Date:   2023-05-26 (Fri, 26 May 2023)

  Changed paths:
    M llvm/lib/Target/AMDGPU/AMDGPU.h
    M llvm/lib/Target/AMDGPU/AMDGPUTargetMachine.cpp
    M llvm/lib/Target/AMDGPU/CMakeLists.txt
    A llvm/lib/Target/AMDGPU/GCNRewritePartialRegUses.cpp
    M llvm/lib/Target/AMDGPU/SIDefines.h
    M llvm/lib/Target/AMDGPU/SIRegisterInfo.cpp
    M llvm/lib/Target/AMDGPU/SIRegisterInfo.h
    M llvm/lib/Target/AMDGPU/SIRegisterInfo.td
    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.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/insertelement.i16.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/insertelement.large.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/insertelement.ll
    M llvm/test/CodeGen/AMDGPU/agpr-copy-no-free-registers.ll
    M llvm/test/CodeGen/AMDGPU/coalesce-identity-copies-undef-subregs.mir
    M llvm/test/CodeGen/AMDGPU/dead-lane.mir
    M llvm/test/CodeGen/AMDGPU/llc-pipeline.ll
    M llvm/test/CodeGen/AMDGPU/llvm.mulo.ll
    M llvm/test/CodeGen/AMDGPU/load-global-i16.ll
    M llvm/test/CodeGen/AMDGPU/loop-live-out-copy-undef-subrange.ll
    M llvm/test/CodeGen/AMDGPU/mad_64_32.ll
    M llvm/test/CodeGen/AMDGPU/mul.ll
    M llvm/test/CodeGen/AMDGPU/promote-constOffset-to-imm.ll
    A llvm/test/CodeGen/AMDGPU/rewrite-partial-reg-uses-dbg.mir
    A llvm/test/CodeGen/AMDGPU/rewrite-partial-reg-uses-gen.mir
    A llvm/test/CodeGen/AMDGPU/rewrite-partial-reg-uses.mir
    M llvm/test/CodeGen/AMDGPU/sdiv64.ll
    M llvm/test/CodeGen/AMDGPU/spill-empty-live-interval.mir
    M llvm/test/CodeGen/AMDGPU/spill-vgpr.ll
    M llvm/test/CodeGen/AMDGPU/srem64.ll
    M llvm/test/CodeGen/AMDGPU/udiv64.ll
    M llvm/test/CodeGen/AMDGPU/urem64.ll

  Log Message:
  -----------
  [AMDGPU] Add pass to rewrite partially used virtual superregisters after RenameIndependentSubregs pass with registers of minimal size.

The main purpose of this is to simplify register pressure tracking as after the pass there is no need
to track subreg liveness anymore.

On the other hand this pass creates more possibilites for the subreg unaware code, as many of the subregs
becomes ordinary registers.

Intersting sideeffect: spill-vgpr.ll has lost a lot of spills.

Reviewed By: #amdgpu, arsenm

Differential Revision: https://reviews.llvm.org/D139732