[PATCH] D28936: AMDGPU: Always allocate emergency stack slot at offset 0

[Matt Arsenault via Phabricator via llvm-commits]

arsenm created this revision.
Herald added subscribers: tony-tye, yaxunl, nhaehnle, wdng, kzhuravl, qcolombet, MatzeB.
Herald added a reviewer: tstellarAMD.

This allows us to ensure that 0 is never a valid pointer
to a user object, and ensures that the offset is always legal
without needing a register to access it. This comes at the cost
of usable offsets and wasted stack space.


https://reviews.llvm.org/D28936

Files:
  lib/Target/AMDGPU/SIFrameLowering.cpp
  lib/Target/AMDGPU/SIMachineFunctionInfo.cpp
  test/CodeGen/AMDGPU/amdgpu.private-memory.ll
  test/CodeGen/AMDGPU/array-ptr-calc-i32.ll
  test/CodeGen/AMDGPU/captured-frame-index.ll
  test/CodeGen/AMDGPU/cgp-addressing-modes.ll
  test/CodeGen/AMDGPU/commute-compares.ll
  test/CodeGen/AMDGPU/control-flow-fastregalloc.ll
  test/CodeGen/AMDGPU/extload-private.ll
  test/CodeGen/AMDGPU/insert_vector_elt.ll
  test/CodeGen/AMDGPU/kernarg-stack-alignment.ll
  test/CodeGen/AMDGPU/local-stack-slot-bug.ll
  test/CodeGen/AMDGPU/private-element-size.ll
  test/CodeGen/AMDGPU/scratch-buffer.ll
  test/CodeGen/AMDGPU/si-spill-sgpr-stack.ll
  test/CodeGen/AMDGPU/spill-m0.ll
  test/CodeGen/AMDGPU/spill-wide-sgpr.ll
  test/CodeGen/AMDGPU/wqm.ll

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