[all-commits] [llvm/llvm-project] b4492c: [RISCV] Use an enum for demanded LMUL in RISCVInse...

[Luke Lau via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: b4492c910cc6a3593b429b0ca16a1c7970e8b879
      https://github.com/llvm/llvm-project/commit/b4492c910cc6a3593b429b0ca16a1c7970e8b879
  Author: Luke Lau <luke at igalia.com>
  Date:   2024-05-21 (Tue, 21 May 2024)

  Changed paths:
    M llvm/lib/Target/RISCV/RISCVInsertVSETVLI.cpp

  Log Message:
  -----------
  [RISCV] Use an enum for demanded LMUL in RISCVInsertVSETVLI. NFC (#92513)

In needVSETVLI used by the forward insertion pass, we have some rules
where we can relax the demanded fields for slides and splats when VL=1.

However this only works if we don't increase LMUL to anything > M1
otherwise we would end up clobbering random registers.

Rather than check the VSETVLIInfo we're transitioning to, store this
information in DemandedFields and have isCompatible check it.

That way an upcoming patch can share these VL=1 rules with
RISCVCoalesceVSETVLI, which uses isCompatible and not needVSETVLI.



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