[PATCH] D132447: AMDGPU: Add a pass to fix SGPR liveness

[Ruiling, Song via Phabricator via llvm-commits]

ruiling created this revision.
ruiling added reviewers: foad, critson, nhaehnle.
Herald added subscribers: kosarev, kerbowa, hiraditya, t-tye, tpr, dstuttard, yaxunl, mgorny, jvesely, kzhuravl, arsenm.
Herald added a project: All.
ruiling requested review of this revision.
Herald added subscribers: llvm-commits, wdng.
Herald added a project: LLVM.

Sometime, we may get a SGPR-PHI with only one meaningful value from
dominator and undefined in another predecessor. The problem with
such pattern is the SGPR might be overwritten in the undefined
predecessor. The pass added here is to make the SGPR also alive in the
originally dead predecessors.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D132447

Files:
  llvm/lib/Target/AMDGPU/AMDGPU.h
  llvm/lib/Target/AMDGPU/AMDGPUTargetMachine.cpp
  llvm/lib/Target/AMDGPU/CMakeLists.txt
  llvm/lib/Target/AMDGPU/SIFixSGPRLiveness.cpp
  llvm/test/CodeGen/AMDGPU/llc-pipeline.ll
  llvm/test/CodeGen/AMDGPU/sgpr-liveness.ll

-------------- next part --------------
A non-text attachment was scrubbed...
Name: D132447.454739.patch
Type: text/x-patch
Size: 11618 bytes
Desc: not available
URL: <http://lists.llvm.org/pipermail/llvm-commits/attachments/20220823/09b3943c/attachment.bin>