[PATCH] D53575: [X86][BMI1] X86DAGToDAGISel: select BEXTR from x & (-1 >> (32 - y)) pattern

[Roman Lebedev via Phabricator via llvm-commits]

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

The final pattern.
There is no test changes:

- We are looking for the pattern with one-use of it's mask,
- If the mask is one-use, https://reviews.llvm.org/D48768 will unfold it into pattern d.
- Thus, the tests have extra-use on the mask.
- Thus, only the BMI2 BZHI can be tested, and it already worked.
- So there is no BMI1 test coverage, we just assume it works since it uses the same codepath.


Repository:
  rL LLVM

https://reviews.llvm.org/D53575

Files:
  lib/Target/X86/X86ISelDAGToDAG.cpp
  lib/Target/X86/X86InstrInfo.td

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