[PATCH] D23749: [NVPTX] Add NVPTXHoistAddrSpaceCast pass.

[Justin Lebar via llvm-commits]

jlebar created this revision.
jlebar added a reviewer: jingyue.
jlebar added subscribers: tra, llvm-commits, majnemer.
Herald added a subscriber: jholewinski.

This pass transforms

  gep (addrspacecast p)

into

  addrspacecast (gep p)

Doing the addrspacecast instruction first (which is valid in NVPTX but
not on all targets) lets LLVM optimize better, because LLVM treats
addrspacecast as a black-box function.

This is particularly important for the idiom clang will use for lowering
the __ldg builtin.

https://reviews.llvm.org/D23749

Files:
  llvm/lib/Target/NVPTX/CMakeLists.txt
  llvm/lib/Target/NVPTX/NVPTX.h
  llvm/lib/Target/NVPTX/NVPTXHoistAddrSpaceCast.cpp
  llvm/lib/Target/NVPTX/NVPTXTargetMachine.cpp
  llvm/test/CodeGen/NVPTX/hoist-addrspace-cast-e2e.ll
  llvm/test/CodeGen/NVPTX/hoist-addrspace-cast.ll

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