[PATCH] D99594: [RISCV] Add support for the stepvector intrinsic

[Fraser Cormack via Phabricator via llvm-commits]

frasercrmck created this revision.
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This adds almost everything required for supporting the new stepvector
intrinsic on RVV. It is lowered to the existing VID_VL SDNode.

The only exception is a limitation that RV32 cannot yet lower the
intrinsic on i64 vectors. This is because the step operand is
(currently) required to be at least as large as the vector element type.
I will look into patching that out and loosening the requirement to only
an integer pointer type.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D99594

Files:
  llvm/lib/Target/RISCV/RISCVISelLowering.cpp
  llvm/lib/Target/RISCV/RISCVISelLowering.h
  llvm/test/CodeGen/RISCV/rvv/fixed-vectors-stepvector-rv32.ll
  llvm/test/CodeGen/RISCV/rvv/fixed-vectors-stepvector-rv64.ll
  llvm/test/CodeGen/RISCV/rvv/stepvector-rv32.ll
  llvm/test/CodeGen/RISCV/rvv/stepvector-rv64.ll

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