[PATCH] D87446: [AMDGPU] Enable scheduling around FP MODE-setting instructions

[Jay Foad via Phabricator via llvm-commits]

foad created this revision.
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Pre-gfx10 all MODE-setting instructions were S_SETREG_B32 which is
marked as having unmodeled side effects, which makes the machine
scheduler treat it as a barrier. Now that we have proper implicit $mode
operands we can use a no-side-effects S_SETMODE_B32 pseudo instead for
setregs that only touch the FP MODE bits, to give the scheduler more
freedom.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D87446

Files:
  llvm/lib/Target/AMDGPU/GCNHazardRecognizer.cpp
  llvm/lib/Target/AMDGPU/SIFoldOperands.cpp
  llvm/lib/Target/AMDGPU/SIISelLowering.cpp
  llvm/lib/Target/AMDGPU/SIInstrInfo.cpp
  llvm/lib/Target/AMDGPU/SIModeRegister.cpp
  llvm/lib/Target/AMDGPU/SOPInstructions.td
  llvm/test/CodeGen/AMDGPU/GlobalISel/llvm.amdgcn.s.setreg.ll
  llvm/test/CodeGen/AMDGPU/fdiv-nofpexcept.ll
  llvm/test/CodeGen/AMDGPU/frem.ll

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