[PATCH] D57389: [X86] Improve use of SHLD/SHRD

[Amaury SECHET via Phabricator via llvm-commits]

deadalnix created this revision.
deadalnix added reviewers: RKSimon, craig.topper.

This extends the variety of pattern that can generate a SHLD instead of using two shifts.

This fixes a regression that would be introduced by D57367 <https://reviews.llvm.org/D57367> or D33587 <https://reviews.llvm.org/D33587>


Repository:
  rL LLVM

https://reviews.llvm.org/D57389

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/shift-double-x86_64.ll
  test/CodeGen/X86/shift-double.ll

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