[all-commits] [llvm/llvm-project] a3c74d: [RISCV] Add support for selecting vid.v from build...

[Fraser Cormack via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: a3c74d6d53fcaf53ac0969dcc7a9ab6dd5c9a9f5
      https://github.com/llvm/llvm-project/commit/a3c74d6d53fcaf53ac0969dcc7a9ab6dd5c9a9f5
  Author: Fraser Cormack <fraser at codeplay.com>
  Date:   2021-02-10 (Wed, 10 Feb 2021)

  Changed paths:
    M llvm/lib/Target/RISCV/RISCVISelLowering.cpp
    M llvm/lib/Target/RISCV/RISCVISelLowering.h
    M llvm/lib/Target/RISCV/RISCVInstrInfoVSDPatterns.td
    M llvm/lib/Target/RISCV/RISCVInstrInfoVVLPatterns.td
    A llvm/test/CodeGen/RISCV/rvv/fixed-vectors-int-buildvec.ll

  Log Message:
  -----------
  [RISCV] Add support for selecting vid.v from build_vector

This patch optimizes a build_vector "index sequence" and lowers it to
the existing custom RISCVISD::VID node. This pattern is common in
autovectorized code.

The custom node was updated to allow it to be used by both scalable and
fixed-length vectors, thus avoiding pattern duplication.

Reviewed By: craig.topper

Differential Revision: https://reviews.llvm.org/D96332