[PATCH] D78811: [AMDGPU] Enable base pointer.

[Christudasan Devadasan via Phabricator via llvm-commits]

cdevadas created this revision.
cdevadas added reviewers: arsen, t-tye, scott.linder.
Herald added subscribers: llvm-commits, kerbowa, hiraditya, tpr, dstuttard, yaxunl, nhaehnle, wdng, jvesely, kzhuravl, arsenm, qcolombet.
Herald added a project: LLVM.

When the callee requires a dynamic stack realignment,
it is not possible to correctly access the incoming
stack arguments using the stack pointer. We reserve a
base pointer in such cases to access the function arguments
inside the callee. The base pointer will hold the incoming
stack pointer value before any kind of delta added to it.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D78811

Files:
  llvm/docs/AMDGPUUsage.rst
  llvm/lib/Target/AMDGPU/SIFrameLowering.cpp
  llvm/lib/Target/AMDGPU/SIMachineFunctionInfo.cpp
  llvm/lib/Target/AMDGPU/SIMachineFunctionInfo.h
  llvm/lib/Target/AMDGPU/SIRegisterInfo.cpp
  llvm/lib/Target/AMDGPU/SIRegisterInfo.h
  llvm/test/CodeGen/AMDGPU/callee-frame-setup.ll
  llvm/test/CodeGen/AMDGPU/pei-scavenge-sgpr-carry-out.mir
  llvm/test/CodeGen/AMDGPU/pei-scavenge-sgpr-gfx9.mir
  llvm/test/CodeGen/AMDGPU/pei-scavenge-sgpr.mir
  llvm/test/CodeGen/AMDGPU/pei-scavenge-vgpr-spill.mir
  llvm/test/CodeGen/AMDGPU/stack-realign.ll

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