[all-commits] [llvm/llvm-project] 7b5cf5: [RISCV] Improve splatPartsI64WithVL for fixed vect...

[Craig Topper via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 7b5cf52f32c09ff68b7f0ae5775dfbafc51a7907
      https://github.com/llvm/llvm-project/commit/7b5cf52f32c09ff68b7f0ae5775dfbafc51a7907
  Author: Craig Topper <craig.topper at sifive.com>
  Date:   2023-08-29 (Tue, 29 Aug 2023)

  Changed paths:
    M llvm/lib/Target/RISCV/RISCVISelLowering.cpp
    M llvm/test/CodeGen/RISCV/rvv/fixed-vectors-bitreverse-vp.ll
    M llvm/test/CodeGen/RISCV/rvv/fixed-vectors-bitreverse.ll
    M llvm/test/CodeGen/RISCV/rvv/fixed-vectors-ctlz-vp.ll
    M llvm/test/CodeGen/RISCV/rvv/fixed-vectors-ctlz.ll
    M llvm/test/CodeGen/RISCV/rvv/fixed-vectors-ctpop-vp.ll
    M llvm/test/CodeGen/RISCV/rvv/fixed-vectors-ctpop.ll
    M llvm/test/CodeGen/RISCV/rvv/fixed-vectors-cttz-vp.ll
    M llvm/test/CodeGen/RISCV/rvv/fixed-vectors-cttz.ll

  Log Message:
  -----------
  [RISCV] Improve splatPartsI64WithVL for fixed vector constants where Hi and Lo are the same and the VL is constant.

If doubling the VL will fit in a vsetivli, use it. It will be cheap
to change and cheap to change back.

This improves codegen from D158896.

Reviewed By: reames

Differential Revision: https://reviews.llvm.org/D158896