[PATCH] D106291: [AMDGPU] Improve killed check for vgpr optimization

[Sebastian Neubauer via Phabricator via llvm-commits]

sebastian-ne created this revision.
sebastian-ne added reviewers: ruiling, arsenm, foad.
Herald added subscribers: kerbowa, hiraditya, t-tye, tpr, dstuttard, yaxunl, nhaehnle, jvesely, kzhuravl, MatzeB.
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The killed flag is not always set. E.g. when a variable is used in a
loop, it is never marked as killed, although it is unused in following
basic blocks.

If the killed flag is not set, check if the register is live in the
endif block. If not, consider it killed in the then and else blocks.

The vgpr-liverange tests have two new tests with loops
(pre-committed, so the diff is visible).


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D106291

Files:
  llvm/lib/Target/AMDGPU/SIOptimizeVGPRLiveRange.cpp
  llvm/test/CodeGen/AMDGPU/GlobalISel/sdiv.i64.ll
  llvm/test/CodeGen/AMDGPU/GlobalISel/srem.i64.ll
  llvm/test/CodeGen/AMDGPU/GlobalISel/udiv.i64.ll
  llvm/test/CodeGen/AMDGPU/GlobalISel/urem.i64.ll
  llvm/test/CodeGen/AMDGPU/bypass-div.ll
  llvm/test/CodeGen/AMDGPU/vgpr-liverange-ir.ll
  llvm/test/CodeGen/AMDGPU/vgpr-liverange.ll

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