[all-commits] [llvm/llvm-project] 811be7: [RISCV][test] Add new tests for mul optimization i...

[Ben Shi via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 811be79433638c3c7eeea65f5438044a5ba8de9a
      https://github.com/llvm/llvm-project/commit/811be79433638c3c7eeea65f5438044a5ba8de9a
  Author: Ben Shi <powerman1st at 163.com>
  Date:   2021-07-30 (Fri, 30 Jul 2021)

  Changed paths:
    M llvm/test/CodeGen/RISCV/rv32zba.ll
    M llvm/test/CodeGen/RISCV/rv64zba.ll

  Log Message:
  -----------
  [RISCV][test] Add new tests for mul optimization in the zba extension with SH*ADD

Reviewed By: craig.topper

Differential Revision: https://reviews.llvm.org/D107064


  Commit: bb6fddb63ca73acb84c39c4d548024bf6398d86e
      https://github.com/llvm/llvm-project/commit/bb6fddb63ca73acb84c39c4d548024bf6398d86e
  Author: Ben Shi <powerman1st at 163.com>
  Date:   2021-07-30 (Fri, 30 Jul 2021)

  Changed paths:
    M llvm/lib/Target/RISCV/RISCVInstrInfo.td
    M llvm/lib/Target/RISCV/RISCVInstrInfoB.td
    M llvm/test/CodeGen/RISCV/rv32zba.ll
    M llvm/test/CodeGen/RISCV/rv64zba.ll
    M llvm/test/CodeGen/RISCV/xaluo.ll

  Log Message:
  -----------
  Optimize mul in the zba extension with SH*ADD

This patch does the following optimization of mul with a constant.

(mul x, 11) -> (SH1ADD (SH2ADD x, x), x)
(mul x, 19) -> (SH1ADD (SH3ADD x, x), x)
(mul x, 13) -> (SH2ADD (SH1ADD x, x), x)
(mul x, 21) -> (SH2ADD (SH2ADD x, x), x)
(mul x, 37) -> (SH2ADD (SH3ADD x, x), x)
(mul x, 25) -> (SH3ADD (SH1ADD x, x), x)
(mul x, 41) -> (SH3ADD (SH2ADD x, x), x)
(mul x, 73) -> (SH3ADD (SH3ADD x, x), x)
(mul x, 27) -> (SH1ADD (SH3ADD x, x), (SH3ADD x, x))
(mul x, 45) -> (SH2ADD (SH3ADD x, x), (SH3ADD x, x))
(mul x, 81) -> (SH3ADD (SH3ADD x, x), (SH3ADD x, x))

Reviewed By: craig.topper

Differential Revision: https://reviews.llvm.org/D107065


Compare: https://github.com/llvm/llvm-project/compare/1e6a93f15c7e...bb6fddb63ca7