[all-commits] [llvm/llvm-project] 65ffcc: [RISCV] Lower VP_CTLZ_ZERO_UNDEF/VP_CTTZ_ZERO_UNDE...

[Liao Chunyu via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 65ffcc099c7f91a15e57b013e2713fa1a49540d2
      https://github.com/llvm/llvm-project/commit/65ffcc099c7f91a15e57b013e2713fa1a49540d2
  Author: LiaoChunyu <chunyu at iscas.ac.cn>
  Date:   2023-07-18 (Tue, 18 Jul 2023)

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

  Log Message:
  -----------
  [RISCV] Lower VP_CTLZ_ZERO_UNDEF/VP_CTTZ_ZERO_UNDEF/VP_CTLZ by converting to FP and extracting the exponent.

D111904, D141585 made RISC-V customized lower vector ISD::CTLZ_ZERO_UNDEF/CTTZ_ZERO_UNDEF/CTLZ
by converting to float and using the float result.

Perhaps VP_CTLZ_ZERO_UNDEF/VP_CTTZ_ZERO_UNDEF/VP_CTLZ could use the similar feature.

Reviewed By: craig.topper

Differential Revision: https://reviews.llvm.org/D155150