[PATCH] D19337: [Tail duplication] Handle source registers with subregisters

[Krzysztof Parzyszek via llvm-commits]

kparzysz created this revision.
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When a block is tail-duplicated, the PHI nodes from that block are replaced with appropriate COPY instructions. When those PHI nodes contained use operands with subregisters, the subregisters were dropped from the COPY instructions, resulting in incorrect code.

Keep track of the subregister information and use this information when remapping instructions from the duplicated block.

Repository:
  rL LLVM

http://reviews.llvm.org/D19337

Files:
  include/llvm/CodeGen/TailDuplicator.h
  lib/CodeGen/TailDuplicator.cpp
  test/CodeGen/Hexagon/tail-dup-subreg-map.ll

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