[PATCH] D123525: [AMDGPU] On gfx908, reserve VGPR for AGPR copy based on register budget.

[Mahesha S via Phabricator via llvm-commits]

hsmhsm updated this revision to Diff 422130.
hsmhsm added a comment.

Refine the logic within indirectCopyToAGPR() while chosing lowest available
VGPR for AGPR copy. Basically, find out the total avaialble unused free
VGPRs (after RegAlloc), and call scavenger (only) that many times to find
the lowest available unused free VGPR.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D123525/new/

https://reviews.llvm.org/D123525

Files:
  llvm/lib/Target/AMDGPU/SIInstrInfo.cpp
  llvm/lib/Target/AMDGPU/SIMachineFunctionInfo.h
  llvm/lib/Target/AMDGPU/SIRegisterInfo.cpp
  llvm/test/CodeGen/AMDGPU/accvgpr-copy.mir
  llvm/test/CodeGen/AMDGPU/accvgpr-spill-scc-clobber.mir
  llvm/test/CodeGen/AMDGPU/agpr-copy-no-free-registers.ll
  llvm/test/CodeGen/AMDGPU/agpr-copy-no-vgprs.mir
  llvm/test/CodeGen/AMDGPU/agpr-copy-sgpr-no-vgprs.mir
  llvm/test/CodeGen/AMDGPU/alloc-aligned-tuples-gfx908.mir
  llvm/test/CodeGen/AMDGPU/av_spill_cross_bb_usage.mir
  llvm/test/CodeGen/AMDGPU/pei-build-av-spill.mir
  llvm/test/CodeGen/AMDGPU/pei-build-spill.mir
  llvm/test/CodeGen/AMDGPU/regalloc-introduces-copy-sgpr-to-agpr.mir
  llvm/test/CodeGen/AMDGPU/spill-agpr-partially-undef.mir
  llvm/test/CodeGen/AMDGPU/spill-agpr.mir
  llvm/test/CodeGen/AMDGPU/spill-vgpr-to-agpr.ll