[PATCH] D138082: GlobalISel: ComputeNumSignBits from load range metadata

[Matt Arsenault via Phabricator via llvm-commits]

arsenm created this revision.
arsenm added reviewers: paquette, aemerson, dsanders, Pierre-vh, foad, craig.topper, RKSimon, spatel.
Herald added subscribers: kosarev, StephenFan, kerbowa, hiraditya, jvesely.
Herald added a project: All.
arsenm requested review of this revision.
Herald added a subscriber: wdng.
Herald added a project: LLVM.

We're missing SimplifyDemandedBits styles of optimizations,
so one case differs from the DAG from not trimming the constant.
The other case is an optimization we get that the DAG doesn't do to
split the 64-bit shift.


https://reviews.llvm.org/D138082

Files:
  llvm/include/llvm/CodeGen/GlobalISel/GenericMachineInstrs.h
  llvm/lib/CodeGen/GlobalISel/GISelKnownBits.cpp
  llvm/test/CodeGen/AMDGPU/load-range-metadata-sign-bits.ll

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