[all-commits] [llvm/llvm-project] ae3ab4: [RISCV] Masked compares should use a tail agnostic...

[Craig Topper via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: ae3ab4f0ec6190ebc19775002b59a36c06848bf3
      https://github.com/llvm/llvm-project/commit/ae3ab4f0ec6190ebc19775002b59a36c06848bf3
  Author: Craig Topper <craig.topper at sifive.com>
  Date:   2021-06-07 (Mon, 07 Jun 2021)

  Changed paths:
    M llvm/lib/Target/RISCV/RISCVInstrInfoVPseudos.td
    M llvm/test/CodeGen/RISCV/rvv/vmfeq-rv32.ll
    M llvm/test/CodeGen/RISCV/rvv/vmfeq-rv64.ll
    M llvm/test/CodeGen/RISCV/rvv/vmfge-rv32.ll
    M llvm/test/CodeGen/RISCV/rvv/vmfge-rv64.ll
    M llvm/test/CodeGen/RISCV/rvv/vmfgt-rv32.ll
    M llvm/test/CodeGen/RISCV/rvv/vmfgt-rv64.ll
    M llvm/test/CodeGen/RISCV/rvv/vmfle-rv32.ll
    M llvm/test/CodeGen/RISCV/rvv/vmfle-rv64.ll
    M llvm/test/CodeGen/RISCV/rvv/vmflt-rv32.ll
    M llvm/test/CodeGen/RISCV/rvv/vmflt-rv64.ll
    M llvm/test/CodeGen/RISCV/rvv/vmfne-rv32.ll
    M llvm/test/CodeGen/RISCV/rvv/vmfne-rv64.ll
    M llvm/test/CodeGen/RISCV/rvv/vmseq-rv32.ll
    M llvm/test/CodeGen/RISCV/rvv/vmseq-rv64.ll
    M llvm/test/CodeGen/RISCV/rvv/vmsge-rv32.ll
    M llvm/test/CodeGen/RISCV/rvv/vmsge-rv64.ll
    M llvm/test/CodeGen/RISCV/rvv/vmsgeu-rv32.ll
    M llvm/test/CodeGen/RISCV/rvv/vmsgeu-rv64.ll
    M llvm/test/CodeGen/RISCV/rvv/vmsgt-rv32.ll
    M llvm/test/CodeGen/RISCV/rvv/vmsgt-rv64.ll
    M llvm/test/CodeGen/RISCV/rvv/vmsgtu-rv32.ll
    M llvm/test/CodeGen/RISCV/rvv/vmsgtu-rv64.ll
    M llvm/test/CodeGen/RISCV/rvv/vmsle-rv32.ll
    M llvm/test/CodeGen/RISCV/rvv/vmsle-rv64.ll
    M llvm/test/CodeGen/RISCV/rvv/vmsleu-rv32.ll
    M llvm/test/CodeGen/RISCV/rvv/vmsleu-rv64.ll
    M llvm/test/CodeGen/RISCV/rvv/vmslt-rv32.ll
    M llvm/test/CodeGen/RISCV/rvv/vmslt-rv64.ll
    M llvm/test/CodeGen/RISCV/rvv/vmsltu-rv32.ll
    M llvm/test/CodeGen/RISCV/rvv/vmsltu-rv64.ll
    M llvm/test/CodeGen/RISCV/rvv/vmsne-rv32.ll
    M llvm/test/CodeGen/RISCV/rvv/vmsne-rv64.ll

  Log Message:
  -----------
  [RISCV] Masked compares should use a tail agnostic policy.

Writes of a mask result are always tail agnostic.

Unfortunately, this seems to have made codegen worse. I can only
think this must be because the vsetvli was acting as some sort
of barrier that prevented some code movement in the scheduler.

Reviewed By: arcbbb

Differential Revision: https://reviews.llvm.org/D103331