[PATCH] D65351: [ARM] Lower "(x<<c) > 0x80000000U" to "lsls" on Thumb1.

[Eli Friedman via Phabricator via llvm-commits]

efriedma created this revision.
efriedma added reviewers: ostannard, samparker.
Herald added subscribers: kristof.beyls, javed.absar.
Herald added a project: LLVM.

This is extremely specific, but saves three instructions when it's legal.  I don't think the code can be usefully generalized.

Depends on D65175 <https://reviews.llvm.org/D65175>.


Repository:
  rL LLVM

https://reviews.llvm.org/D65351

Files:
  lib/Target/ARM/ARMBaseInstrInfo.cpp
  lib/Target/ARM/ARMISelLowering.cpp
  lib/Target/ARM/ARMISelLowering.h
  lib/Target/ARM/ARMInstrInfo.td
  lib/Target/ARM/ARMInstrThumb.td
  test/CodeGen/Thumb/cmp-and-fold.ll

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