[all-commits] [llvm/llvm-project] c45fc6: [RISCV] Use experimental.vp.splat to splat specifi...

[Yeting Kuo via All-commits]

  Branch: refs/heads/release/19.x
  Home:   https://github.com/llvm/llvm-project
  Commit: c45fc691a2a39318fc146ba1665a2fe2d9f43b2b
      https://github.com/llvm/llvm-project/commit/c45fc691a2a39318fc146ba1665a2fe2d9f43b2b
  Author: Yeting Kuo <46629943+yetingk at users.noreply.github.com>
  Date:   2024-08-19 (Mon, 19 Aug 2024)

  Changed paths:
    M llvm/lib/Target/RISCV/RISCVCodeGenPrepare.cpp
    M llvm/test/CodeGen/RISCV/rvv/fixed-vectors-strided-vpload.ll
    M llvm/test/CodeGen/RISCV/rvv/strided-vpload.ll

  Log Message:
  -----------
  [RISCV] Use experimental.vp.splat to splat specific vector length elements. (#101329)

Previously, llvm IR is hard to create a scalable vector splat with a
specific vector length, so we use riscv.vmv.v.x and riscv.vmv.v.f to do
this work. But the two rvv intrinsics needs strict type constraint which
can not support fixed vector types and illegal vector types. Using
vp.splat could preserve old functionality and also generate more
optimized code for vector types and illegal vectors.
This patch also fixes crash for getEVT not serving ptr types.

(cherry picked from commit 87af9ee870ad7ca93abced0b09459c3760dec891)



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