[all-commits] [llvm/llvm-project] 0d88f6: GlobalISel: ComputeNumSignBits from load range met...

[Matt Arsenault via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 0d88f662ff4db7e78a6c48db79ef62c5228d5f2a
      https://github.com/llvm/llvm-project/commit/0d88f662ff4db7e78a6c48db79ef62c5228d5f2a
  Author: Matt Arsenault <Matthew.Arsenault at amd.com>
  Date:   2024-07-01 (Mon, 01 Jul 2024)

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

  Log Message:
  -----------
  GlobalISel: ComputeNumSignBits from load range metadata

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



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