[all-commits] [llvm/llvm-project] ae0ab2: [TableGen] Fix calculation of Lanemask for RCs wit...

[Sander de Smalen via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: ae0ab2486287a914d9506ac2ff73e41063bf9a7e
      https://github.com/llvm/llvm-project/commit/ae0ab2486287a914d9506ac2ff73e41063bf9a7e
  Author: Sander de Smalen <sander.desmalen at arm.com>
  Date:   2024-11-04 (Mon, 04 Nov 2024)

  Changed paths:
    M llvm/test/TableGen/ArtificialSubregs.td
    M llvm/utils/TableGen/Common/CodeGenRegisters.cpp

  Log Message:
  -----------
  [TableGen] Fix calculation of Lanemask for RCs with artificial subregs. (#114392)

TableGen builds up a map of "SubRegIdx -> Subclass" where Subclass is
the largest class where all registers have SubRegIdx as a sub-register.
When SubRegIdx (vis-a-vis the sub-register) is artificial it should
still include it in the map. This map is used in various places,
including in the calculation of the Lanemask of a register class, which
otherwise calculates an incorrect lanemask.



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