[all-commits] [llvm/llvm-project] 10879c: [RISCV] Add tests for possible splat optimizations

[Fraser Cormack via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 10879c26a20307abb3f0d29da6504f6cc9cc41e3
      https://github.com/llvm/llvm-project/commit/10879c26a20307abb3f0d29da6504f6cc9cc41e3
  Author: Fraser Cormack <fraser at codeplay.com>
  Date:   2022-01-28 (Fri, 28 Jan 2022)

  Changed paths:
    M llvm/test/CodeGen/RISCV/rvv/fixed-vectors-fp-buildvec.ll
    M llvm/test/CodeGen/RISCV/rvv/fixed-vectors-int-buildvec.ll
    A llvm/test/CodeGen/RISCV/rvv/splat-vectors.ll

  Log Message:
  -----------
  [RISCV] Add tests for possible splat optimizations

These splats -- whether BUILD_VECTOR or SPLAT_VECTOR -- are formed by
first extracting a value from a vector and splatting it to all elements
of the destination vector. These could be performed more optimally,
avoiding the drop to scalar, using RVV's vrgather, for example.