[all-commits] [llvm/llvm-project] f0332d: [RISCV] Improve vector fceil/ffloor lowering by ch...

[Craig Topper via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: f0332d12aeecf08420f2595e4b07a71849c931e3
      https://github.com/llvm/llvm-project/commit/f0332d12aeecf08420f2595e4b07a71849c931e3
  Author: Craig Topper <craig.topper at sifive.com>
  Date:   2022-09-05 (Mon, 05 Sep 2022)

  Changed paths:
    M llvm/lib/Target/RISCV/RISCVISelLowering.cpp
    M llvm/lib/Target/RISCV/RISCVISelLowering.h
    M llvm/lib/Target/RISCV/RISCVInstrInfo.td
    M llvm/lib/Target/RISCV/RISCVInstrInfoVPseudos.td
    M llvm/lib/Target/RISCV/RISCVInstrInfoVVLPatterns.td
    M llvm/lib/Target/RISCV/RISCVTargetTransformInfo.cpp
    M llvm/test/Analysis/CostModel/RISCV/fround.ll
    M llvm/test/CodeGen/RISCV/rvv/fceil-sdnode.ll
    M llvm/test/CodeGen/RISCV/rvv/ffloor-sdnode.ll
    M llvm/test/CodeGen/RISCV/rvv/fixed-vectors-fp.ll

  Log Message:
  -----------
  [RISCV] Improve vector fceil/ffloor lowering by changing FRM.

This adds new VFCVT pseudoinstructions that take a rounding mode operand. A custom inserter is used to insert additional instructions to change FRM around the
VFCVT.

Some of this is borrowed from D122860, but takes a somewhat different direction. We may migrate to that patch, but for now I was trying to keep this as independent from
RVV intrinsics as I could.

A followup patch will use this approach for FROUND too.

Still need to fix the cost model.

Reviewed By: arcbbb

Differential Revision: https://reviews.llvm.org/D133238