[all-commits] [llvm/llvm-project] 1e3a24: [InitUndef] Don't use largest super class (#107885)

[Nikita Popov via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 1e3a24d2e4eb63c17b962161ae6588d1b2c178f8
      https://github.com/llvm/llvm-project/commit/1e3a24d2e4eb63c17b962161ae6588d1b2c178f8
  Author: Nikita Popov <npopov at redhat.com>
  Date:   2024-09-11 (Wed, 11 Sep 2024)

  Changed paths:
    M llvm/include/llvm/CodeGen/TargetRegisterInfo.h
    M llvm/lib/CodeGen/InitUndef.cpp
    M llvm/lib/Target/ARM/ARMBaseRegisterInfo.h
    M llvm/lib/Target/RISCV/RISCVRegisterInfo.h
    M llvm/test/CodeGen/RISCV/rvv/subregister-undef-early-clobber.mir

  Log Message:
  -----------
  [InitUndef] Don't use largest super class (#107885)

The InitUndef pass currently uses the getLargestSuperClass() hook (which
is only used by that pass) to chose the register to initialize. This was done
to reduce the number of undef init pseudos needed, e.g. so that the vrnov0
regclass would use the same pseudo as v0. After #106744 we use a single
generic pseudo, so this is no longer necessary.



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