[all-commits] [llvm/llvm-project] 58de4b: [AMDGPU] Use pseudo instructions for readlane/writ...

[Jay Foad via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 58de4b205310d18614eabdcbaa1772e9fc090df3
      https://github.com/llvm/llvm-project/commit/58de4b205310d18614eabdcbaa1772e9fc090df3
  Author: Jay Foad <jay.foad at amd.com>
  Date:   2020-10-29 (Thu, 29 Oct 2020)

  Changed paths:
    M llvm/lib/Target/AMDGPU/GCNHazardRecognizer.cpp
    M llvm/lib/Target/AMDGPU/SIFrameLowering.cpp
    M llvm/lib/Target/AMDGPU/SIInstrInfo.cpp
    M llvm/lib/Target/AMDGPU/SIRegisterInfo.cpp
    M llvm/test/CodeGen/AMDGPU/callee-frame-setup.ll
    M llvm/test/CodeGen/AMDGPU/cross-block-use-is-not-abi-copy.ll
    M llvm/test/CodeGen/AMDGPU/csr-gfx10.ll
    M llvm/test/CodeGen/AMDGPU/fold-reload-into-exec.mir
    M llvm/test/CodeGen/AMDGPU/fold-reload-into-m0.mir
    M llvm/test/CodeGen/AMDGPU/mul24-pass-ordering.ll
    M llvm/test/CodeGen/AMDGPU/pei-scavenge-vgpr-spill.mir
    M llvm/test/CodeGen/AMDGPU/sgpr-spill-partially-undef.mir
    M llvm/test/CodeGen/AMDGPU/sibling-call.ll
    M llvm/test/CodeGen/AMDGPU/smem-war-hazard.mir
    M llvm/test/CodeGen/AMDGPU/spill-reg-tuple-super-reg-use.mir
    M llvm/test/CodeGen/AMDGPU/spill-special-sgpr.mir
    M llvm/test/CodeGen/AMDGPU/spill192.mir
    M llvm/test/CodeGen/AMDGPU/spill_more_than_wavesize_csr_sgprs.ll
    M llvm/test/CodeGen/AMDGPU/stack-realign.ll
    M llvm/test/CodeGen/AMDGPU/vccz-corrupt-bug-workaround.mir
    M llvm/test/CodeGen/AMDGPU/vgpr-tuple-allocation.ll

  Log Message:
  -----------
  [AMDGPU] Use pseudo instructions for readlane/writelane

This reverts r227987 "R600/SI: Determine target-specific encoding of READLANE and WRITELANE early v2".

All the codegen changes are caused by the post-RA scheduler no longer
treating readlane/writelane as scheduling barriers due to having
unmodelled side effects. (The pseudos are hasSideEffects = 0, but the
real instructions are hasSideEffects = ? which TableGen conservatively
treats as 1.)

Differential Revision: https://reviews.llvm.org/D90401