[all-commits] [llvm/llvm-project] 50f9b3: [RISCV] Prefer vmv.s.x for build_vector a, undef, ...

[Philip Reames via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 50f9b34b5340cfb32d14920bb0d41a90f48ffc40
      https://github.com/llvm/llvm-project/commit/50f9b34b5340cfb32d14920bb0d41a90f48ffc40
  Author: Philip Reames <preames at rivosinc.com>
  Date:   2025-04-17 (Thu, 17 Apr 2025)

  Changed paths:
    M llvm/lib/Target/RISCV/RISCVISelLowering.cpp
    M llvm/test/CodeGen/RISCV/rvv/fixed-vectors-binop-splats.ll
    M llvm/test/CodeGen/RISCV/rvv/fixed-vectors-buildvec-of-binop.ll
    M llvm/test/CodeGen/RISCV/rvv/fixed-vectors-shuffle-vslide1up.ll
    M llvm/test/CodeGen/RISCV/rvv/fixed-vectors-unaligned.ll
    M llvm/test/CodeGen/RISCV/rvv/fold-scalar-load-crash.ll
    M llvm/test/CodeGen/RISCV/rvv/pr125306.ll

  Log Message:
  -----------
  [RISCV] Prefer vmv.s.x for build_vector a, undef, ..., undef (#136164)

If we have a build vector which could be either a splat or a scalar
insert, prefer the scalar insert. At high LMUL, this reduces vector
register pressure (locally, the use will likely still be aligned), and
the amount of work performed for the splat.



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