[all-commits] [llvm/llvm-project] 706e19: [CodeGen] Remove target SubRegLiveness flags (#95437)

[David Green via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 706e1975400b3f30bd406b694bb711a7c7dbe1c4
      https://github.com/llvm/llvm-project/commit/706e1975400b3f30bd406b694bb711a7c7dbe1c4
  Author: David Green <david.green at arm.com>
  Date:   2024-06-14 (Fri, 14 Jun 2024)

  Changed paths:
    M llvm/lib/CodeGen/InitUndef.cpp
    M llvm/lib/CodeGen/MachineRegisterInfo.cpp
    M llvm/lib/Target/ARM/ARMSubtarget.cpp
    M llvm/lib/Target/Hexagon/HexagonSubtarget.cpp
    M llvm/lib/Target/PowerPC/PPCSubtarget.cpp
    M llvm/lib/Target/RISCV/RISCVSubtarget.cpp
    M llvm/test/CodeGen/ARM/regcoal-invalid-subrange-update.mir
    M llvm/test/CodeGen/Hexagon/bit-gen-rseq.ll
    M llvm/test/CodeGen/Hexagon/regalloc-bad-undef.mir
    M llvm/test/CodeGen/Hexagon/verify-liveness-at-def.mir
    M llvm/test/CodeGen/PowerPC/atomics-i128-ldst.ll
    M llvm/test/CodeGen/PowerPC/atomics-i128.ll
    M llvm/test/CodeGen/PowerPC/mma-outer-product.ll
    M llvm/test/CodeGen/PowerPC/ppc64-acc-regalloc.ll
    M llvm/test/CodeGen/PowerPC/subreg-killed.mir
    M llvm/test/CodeGen/RISCV/early-clobber-tied-def-subreg-liveness.ll
    M llvm/test/CodeGen/RISCV/regalloc-last-chance-recoloring-failure.ll
    M llvm/test/CodeGen/RISCV/rvv/subregister-undef-early-clobber.mir
    M llvm/test/CodeGen/RISCV/rvv/undef-earlyclobber-chain.ll
    M llvm/test/CodeGen/RISCV/rvv/undef-earlyclobber-chain.mir
    M llvm/test/CodeGen/RISCV/rvv/vrgatherei16-subreg-liveness.ll
    M llvm/test/CodeGen/Thumb2/LowOverheadLoops/spillingmove.mir
    M llvm/test/CodeGen/Thumb2/LowOverheadLoops/subreg-liveness.mir

  Log Message:
  -----------
  [CodeGen] Remove target SubRegLiveness flags (#95437)

This removes the uses of target flags to disable subreg liveness,
relying on the `-enable-subreg-liveness` flag instead. The
`-enable-subreg-liveness` flag has been changed to take precedence over
the subtarget if set, and one use of `Subtarget->enableSubRegLiveness()`
has been changed to `MRI->subRegLivenessEnabled()` to make sure the
option properly applies.



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