[PATCH] D47453: [X86] Emit BZHI when mask is ~(-1 << nbits))

[Roman Lebedev via Phabricator via llvm-commits]

lebedev.ri updated this revision to Diff 148830.
lebedev.ri added a comment.

Rebased ontop of reworked tests,
Redo patternmatch ontop of the first matcher there, `x & ((1 << y) - 1)`.


Repository:
  rL LLVM

https://reviews.llvm.org/D47453

Files:
  lib/Target/X86/X86InstrInfo.td
  test/CodeGen/X86/bmi-bzhi.ll

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