[PATCH] D29543: AMDGPU: Don't add emergency stack slot if all spills are SGPR->VGPR

[Matt Arsenault via Phabricator via llvm-commits]

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

This should avoid reporting any stack needs to be allocated in the
case where no stack is truly used. An unused stack slot is still
left around in other cases where there are real stack objects
but no spilling occurs.


https://reviews.llvm.org/D29543

Files:
  lib/Target/AMDGPU/SIFrameLowering.cpp
  test/CodeGen/AMDGPU/si-sgpr-spill.ll

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