[PATCH] D104237: [RISCV][VP] Lower FP VP ISD nodes to RVV instructions

[Fraser Cormack via Phabricator via llvm-commits]

frasercrmck created this revision.
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With the exception of `frem`, this patch supports the current set of VP
floating-point binary intrinsics by lowering them to to RVV instructions. It
does so by using the existing `RISCVISD *_VL` custom nodes as an intermediate
layer. Both scalable and fixed-length vectors are supported by using this
method.

The `frem` node is unsupported due to a lack of available instructions. For
fixed-length vectors we could scalarize but that option is not (currently)
available for scalable-vector types. The support is intentionally left out so
it equivalent for both vector types.

The matching of vector/scalar forms is currently lacking, as scalable vector
types do not lower to the custom `VFMV_V_F_VL` node. We could either make
floating-point scalable vector splats lower to this node, or support the
matching of multiple kinds of splat via a `ComplexPattern`, much like we do for
integer types.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D104237

Files:
  llvm/lib/Target/RISCV/RISCVISelLowering.cpp
  llvm/test/CodeGen/RISCV/rvv/fixed-vectors-vfadd-vp.ll
  llvm/test/CodeGen/RISCV/rvv/fixed-vectors-vfdiv-vp.ll
  llvm/test/CodeGen/RISCV/rvv/fixed-vectors-vfmul-vp.ll
  llvm/test/CodeGen/RISCV/rvv/fixed-vectors-vfrdiv-vp.ll
  llvm/test/CodeGen/RISCV/rvv/fixed-vectors-vfrsub-vp.ll
  llvm/test/CodeGen/RISCV/rvv/fixed-vectors-vfsub-vp.ll
  llvm/test/CodeGen/RISCV/rvv/vfadd-vp.ll
  llvm/test/CodeGen/RISCV/rvv/vfdiv-vp.ll
  llvm/test/CodeGen/RISCV/rvv/vfmul-vp.ll
  llvm/test/CodeGen/RISCV/rvv/vfrdiv-vp.ll
  llvm/test/CodeGen/RISCV/rvv/vfrsub-vp.ll
  llvm/test/CodeGen/RISCV/rvv/vfsub-vp.ll

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