[PATCH] D17673: DAGCombiner: Reduce 64-bit BFE pattern to pattern on 32-bit component

[Matt Arsenault via llvm-commits]

arsenm created this revision.
arsenm added a subscriber: llvm-commits.
Herald added a reviewer: tstellarAMD.

If the extracted bits are restricted to the upper half or lower half, this can be truncated.

http://reviews.llvm.org/D17673

Files:
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  test/CodeGen/AArch64/arm64-bitfield-extract.ll
  test/CodeGen/AMDGPU/cgp-bitfield-extract.ll
  test/CodeGen/AMDGPU/shift-and-i128-ubfe.ll
  test/CodeGen/AMDGPU/shift-and-i64-ubfe.ll
  test/CodeGen/X86/bmi.ll

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