[PATCH] D12908: [AArch64] Improved bitfield instruction selection.

[Geoff Berry via llvm-commits]

gberry created this revision.
gberry added reviewers: jmolloy, t.p.northover.
gberry added subscribers: mcrosier, llvm-commits.
Herald added subscribers: rengolin, aemerson.

For bitfield insert OR matching, check both operands for larger pattern
first before checking for smaller pattern.

Add pattern for unsigned bitfield insert-in-zero done with SHL+AND.

Resolves PR21631.

http://reviews.llvm.org/D12908

Files:
  lib/Target/AArch64/AArch64ISelDAGToDAG.cpp
  test/CodeGen/AArch64/bitfield-insert.ll
  test/CodeGen/AArch64/xbfiz.ll

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