[all-commits] [llvm/llvm-project] 91d233: [RISCV] Use a tail agnostic vslideup if possible f...

[Luke Lau via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 91d23370cd4608f84f5209e445579a3b24ae3545
      https://github.com/llvm/llvm-project/commit/91d23370cd4608f84f5209e445579a3b24ae3545
  Author: Luke Lau <luke at igalia.com>
  Date:   2024-02-28 (Wed, 28 Feb 2024)

  Changed paths:
    M llvm/lib/Target/RISCV/RISCVISelLowering.cpp
    M llvm/test/CodeGen/RISCV/rvv/insert-subvector.ll
    M llvm/test/CodeGen/RISCV/rvv/setcc-fp-vp.ll
    M llvm/test/CodeGen/RISCV/rvv/setcc-fp.ll
    M llvm/test/CodeGen/RISCV/rvv/setcc-int-vp.ll
    M llvm/test/CodeGen/RISCV/rvv/setcc-integer.ll
    M llvm/test/CodeGen/RISCV/rvv/vector-interleave-store.ll
    M llvm/test/CodeGen/RISCV/rvv/vector-interleave.ll
    M llvm/test/CodeGen/RISCV/rvv/vfptoi-sdnode.ll
    M llvm/test/CodeGen/RISCV/rvv/vreductions-fp-sdnode.ll

  Log Message:
  -----------
  [RISCV] Use a tail agnostic vslideup if possible for scalable insert_subvector (#83146)

If we know that an insert_subvector inserting a fixed subvector will
overwrite the entire tail of the vector, we use a tail agnostic
vslideup. This was added in https://reviews.llvm.org/D147347, but we can
do the same thing for scalable vectors too.

The `Policy` variable is defined in a slightly weird place but this is
to mirror the fixed length subvector code path as closely as possible. I
think we may be able to deduplicate them in future.



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