[all-commits] [llvm/llvm-project] ff0f20: [RISCV] Bitcast fixed length bf16/f16 build_vector...

[Craig Topper via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: ff0f2011e475141454028bce9cf7c6ff37a49620
      https://github.com/llvm/llvm-project/commit/ff0f2011e475141454028bce9cf7c6ff37a49620
  Author: Craig Topper <craig.topper at sifive.com>
  Date:   2024-09-03 (Tue, 03 Sep 2024)

  Changed paths:
    M llvm/lib/Target/RISCV/RISCVISelLowering.cpp
    A llvm/test/CodeGen/RISCV/rvv/fixed-vectors-fp-buildvec-bf16.ll
    M llvm/test/CodeGen/RISCV/rvv/fixed-vectors-fp-buildvec.ll
    M llvm/test/CodeGen/RISCV/rvv/fixed-vectors-fp-setcc.ll
    M llvm/test/CodeGen/RISCV/rvv/fixed-vectors-fp-splat-bf16.ll
    M llvm/test/CodeGen/RISCV/rvv/fixed-vectors-fp-splat.ll
    M llvm/test/CodeGen/RISCV/rvv/fixed-vectors-fp.ll
    M llvm/test/CodeGen/RISCV/rvv/fixed-vectors-setcc-fp-vp.ll
    M llvm/test/CodeGen/RISCV/rvv/fixed-vectors-vfadd-vp.ll
    M llvm/test/CodeGen/RISCV/rvv/fixed-vectors-vfdiv-vp.ll
    M llvm/test/CodeGen/RISCV/rvv/fixed-vectors-vfma-vp.ll
    M llvm/test/CodeGen/RISCV/rvv/fixed-vectors-vfmax.ll
    M llvm/test/CodeGen/RISCV/rvv/fixed-vectors-vfmin.ll
    M llvm/test/CodeGen/RISCV/rvv/fixed-vectors-vfmul-vp.ll
    M llvm/test/CodeGen/RISCV/rvv/fixed-vectors-vfsub-vp.ll
    M llvm/test/CodeGen/RISCV/rvv/fixed-vectors-vpmerge-bf16.ll
    M llvm/test/CodeGen/RISCV/rvv/fixed-vectors-vpmerge.ll

  Log Message:
  -----------
  [RISCV] Bitcast fixed length bf16/f16 build_vector to i16 with Zvfbfmin/Zvfhmin+Zfbfmin/Zfhmin. (#106637)

Previously, if Zfbfmin/Zfhmin were enabled, we only handled
build_vectors that could be turned into splat_vectors. We promoted them
to f32 splats by extending in the scalar domain and narrowing in the
vector domain.

This patch fixes a crash where we failed to account for whether the f32
vector type fit in LMUL<=8.

Because the new lowering occurs after type legalization, we have to be
careful to use XLenVT for the scalar integer type and use custom cast
nodes.



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