[all-commits] [llvm/llvm-project] f36ec4: [RISCV] Add test case showing fli being hoisted ou...

[Craig Topper via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: f36ec414c979466fdd48dcc97d9f037a86704cea
      https://github.com/llvm/llvm-project/commit/f36ec414c979466fdd48dcc97d9f037a86704cea
  Author: Craig Topper <craig.topper at sifive.com>
  Date:   2023-03-17 (Fri, 17 Mar 2023)

  Changed paths:
    A llvm/test/CodeGen/RISCV/fli-licm.ll

  Log Message:
  -----------
  [RISCV] Add test case showing fli being hoisted out of a loop and creating extra copies/spills.

Test case for D146314.

Differential Revision: https://reviews.llvm.org/D146315


  Commit: 0a895c39adaf35f3c8d29573eb636b2cccf08d7c
      https://github.com/llvm/llvm-project/commit/0a895c39adaf35f3c8d29573eb636b2cccf08d7c
  Author: Craig Topper <craig.topper at sifive.com>
  Date:   2023-03-17 (Fri, 17 Mar 2023)

  Changed paths:
    M llvm/lib/Target/RISCV/RISCVInstrInfoZfa.td
    M llvm/test/CodeGen/RISCV/fli-licm.ll

  Log Message:
  -----------
  [RISCV] Add isAsCheapAsAMove to FLI instructions.

This can prevent unnecessarily hoisting out of loops.

Test case cribbed from AArch64.

I also intend to make them rematerializable.

Differential Revision: https://reviews.llvm.org/D146314


Compare: https://github.com/llvm/llvm-project/compare/8ae4f833354d...0a895c39adaf