[PATCH] D12414: [NVPTX] add an NVPTX-specific alias analysis

[Jingyue Wu via llvm-commits]

jingyue created this revision.
jingyue added reviewers: wengxt, hfinkel, dberlin, chandlerc, jholewinski.
jingyue added subscribers: llvm-commits, eliben, meheff, broune.
Herald added a subscriber: jholewinski.

It reports two pointers no alias if they are in different non-generic
address spaces interpreted by the NVPTX backend.

This work is motivated by the discussion at
http://lists.llvm.org/pipermail/llvm-dev/2015-August/089023.html. We reach the
consensus that we should

1. create a NVPTX-specific alias analysis that leverages address spaces,
   because other architectures interpret address space numbers differently.

2. customize the pass manager builder to enable this alias analysis in the
   standard optimization pipeline only for NVPTX.

This patch only completes Step 1.

test/CodeGen/NVPTX/aa.ll demonstrates how this alias analysis can promote LICM.

Initial patch by Xuetian Weng.

http://reviews.llvm.org/D12414

Files:
  lib/Target/NVPTX/CMakeLists.txt
  lib/Target/NVPTX/NVPTXAliasAnalysis.cpp
  lib/Target/NVPTX/NVPTXAliasAnalysis.h
  lib/Target/NVPTX/NVPTXTargetMachine.cpp
  test/CodeGen/NVPTX/aa.ll

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