[PATCH] D156863: [RISCV] Teach lowerScalarInsert to handle scalar value is the first element of a fixed vector.

[Yeting Kuo via Phabricator via llvm-commits]

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D155929 <https://reviews.llvm.org/D155929> teach lowerScalarInsert to handl start value (extractelement scalable_vector, 0)
and specifically converts fixed extracted vectors to scalable vectors when
lowering vector reduction. It's not enough because there is another way to
create (extractelement fixed_vector, 0) as a start value of lowerScalarInsert
like #64327.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D156863

Files:
  llvm/lib/Target/RISCV/RISCVISelLowering.cpp
  llvm/test/CodeGen/RISCV/rvv/fixed-vectors-reduction-int-vp.ll

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