[PATCH] D101769: [LegalizeIntegerTypes] Promote EXTEND_VECTOR_INREG operands

[Fraser Cormack via Phabricator via llvm-commits]

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This patch adds support for the TypePromoteInteger action on the
operands of the various *_EXTEND_VECTOR_INREG nodes.

The attached test case covers the situation where the operand of

  v128i32 = any_extend_vector_inreg v256i16

is promoted to

  v128i32 = any_extend_vector_inreg v256i32

The shuffle is eventually scalarized so the output is unwieldy and the
test isn't particularly quick to compile.

In terms of the ideal RISC-V codegen, we may want to add v256i16 to the
list of MVT types, at which point we'd stop scalarizing the shuffle but
lose our only test case.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D101769

Files:
  llvm/lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp
  llvm/lib/CodeGen/SelectionDAG/LegalizeTypes.h
  llvm/test/CodeGen/RISCV/rvv/any-extend-vector-inreg.ll

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