[all-commits] [llvm/llvm-project] 7c4e71: [AMDGPU] Enable base pointer.

[cdevadas via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 7c4e711ef8d8500349d7b33910f53edbb676fa67
      https://github.com/llvm/llvm-project/commit/7c4e711ef8d8500349d7b33910f53edbb676fa67
  Author: Christudasan Devadasan <Christudasan.Devadasan at amd.com>
  Date:   2020-05-17 (Sun, 17 May 2020)

  Changed paths:
    M llvm/docs/AMDGPUUsage.rst
    M llvm/lib/Target/AMDGPU/SIFrameLowering.cpp
    M llvm/lib/Target/AMDGPU/SIMachineFunctionInfo.cpp
    M llvm/lib/Target/AMDGPU/SIMachineFunctionInfo.h
    M llvm/lib/Target/AMDGPU/SIRegisterInfo.cpp
    M llvm/lib/Target/AMDGPU/SIRegisterInfo.h
    M llvm/test/CodeGen/AMDGPU/fix-frame-ptr-reg-copy-livein.ll
    M llvm/test/CodeGen/AMDGPU/pei-scavenge-sgpr-carry-out.mir
    M llvm/test/CodeGen/AMDGPU/pei-scavenge-sgpr-gfx9.mir
    M llvm/test/CodeGen/AMDGPU/pei-scavenge-sgpr.mir
    M llvm/test/CodeGen/AMDGPU/stack-realign.ll

  Log Message:
  -----------
  [AMDGPU] Enable base pointer.

When the callee requires a dynamic stack realignment,
it is not possible to correcty 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.

Reviewed By: arsenm, scott.linder

Differential Revision: https://reviews.llvm.org/D78811