[all-commits] [llvm/llvm-project] 52cb3a: [AMDGPU] Remove dead frame indices after sgpr spill.

[Mahesha S via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 52cb3af08c2ac917557d67bbbf8a91cb80bed6fc
      https://github.com/llvm/llvm-project/commit/52cb3af08c2ac917557d67bbbf8a91cb80bed6fc
  Author: hsmahesha <mahesha.comp at gmail.com>
  Date:   2021-10-12 (Tue, 12 Oct 2021)

  Changed paths:
    M llvm/lib/Target/AMDGPU/SILowerSGPRSpills.cpp
    M llvm/lib/Target/AMDGPU/SIMachineFunctionInfo.cpp
    M llvm/lib/Target/AMDGPU/SIRegisterInfo.cpp
    A llvm/test/CodeGen/AMDGPU/sgpr-spill-incorrect-fi-bookkeeping-bug.ll

  Log Message:
  -----------
  [AMDGPU] Remove dead frame indices after sgpr spill.

All those frame indices which are dead after sgpr spill should be removed from
the function frame. Othewise, there is a side effect such as re-mapping of free
frame index ids by the later pass(es) like "stack slot coloring" which in turn
could mess-up with the book keeping of "frame index to VGPR lane".

Reviewed By: cdevadas

Differential Revision: https://reviews.llvm.org/D111150