[PATCH] D82370: [AMDGPU] Rework SCC copy

[Piotr Sobczak via Phabricator via llvm-commits]

piotr created this revision.
Herald added subscribers: llvm-commits, kerbowa, hiraditya, t-tye, tpr, dstuttard, yaxunl, nhaehnle, wdng, jvesely, kzhuravl, arsenm.
Herald added a project: LLVM.
piotr added a reviewer: arsenm.

In D81925 <https://reviews.llvm.org/D81925>, S_CMP_LG_U64 was used for copies to SCC,
which is only safe for hw with hasScalarCompareEq64.
Rework this part to use the lower part for the comparison
and use S_CMP_LG_U32 instead.

Additionally, remove pattern for selects with 64-bit
inputs, which are rare, because handling them properly
requires more thought.

Depends on D81925 <https://reviews.llvm.org/D81925>.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D82370

Files:
  llvm/lib/Target/AMDGPU/SIInstrInfo.cpp
  llvm/lib/Target/AMDGPU/SOPInstructions.td
  llvm/test/CodeGen/AMDGPU/addrspacecast.ll
  llvm/test/CodeGen/AMDGPU/amdgpu-codegenprepare-idiv.ll
  llvm/test/CodeGen/AMDGPU/sdiv64.ll
  llvm/test/CodeGen/AMDGPU/srem64.ll
  llvm/test/CodeGen/AMDGPU/trunc.ll

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