[PATCH] D52304: [X86][BMI1]: X86DAGToDAGISel: select BEXTR from x & ~(-1 << nbits) pattern

[Roman Lebedev via Phabricator via llvm-commits]

lebedev.ri created this revision.
lebedev.ri added reviewers: RKSimon, craig.topper, spatel.

As discussed in https://reviews.llvm.org/D48491, we can't really do this in the TableGen, since we need to produce *two* instructions.
This only implements one single pattern. The other 3 patterns will be in follow-ups.
I'm not sure yet if we want to also fuse shift into here (i.e `(x >> start) & ...`)


Repository:
  rL LLVM

https://reviews.llvm.org/D52304

Files:
  lib/Target/X86/X86ISelDAGToDAG.cpp
  test/CodeGen/X86/extract-bits.ll
  test/CodeGen/X86/extract-lowbits.ll

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