[PATCH] D56199: [X86] Support SHLD/SHRD masked shift-counts (PR34641)

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon created this revision.
RKSimon added reviewers: spatel, craig.topper, pcordes, andreadb.

Peek through shift modulo masks while matching double shift patterns.

I was hoping to delay this until I could remove the X86 code with generic funnel shift matching (PR40081) but this will do for now.


Repository:
  rL LLVM

https://reviews.llvm.org/D56199

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/shift-double.ll

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