[PATCH] D155929: [RISCV] Use the first element of source as the start value of reduction.

[Yeting Kuo via Phabricator via llvm-commits]

fakepaper56 updated this revision to Diff 543245.
fakepaper56 added a comment.

This update does 3 things:

1. Since `(extractelement fixed_vec, 0)` may be a start of vp.reduce, we need to

handle this for `lowerScalarInsert`.

2. Remove function getFirstElement().
3. Add test CodeGen/RISCV/rvv/combine-extractelement-vp-reduce.ll for 1.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D155929/new/

https://reviews.llvm.org/D155929

Files:
  llvm/lib/Target/RISCV/RISCVISelLowering.cpp
  llvm/test/CodeGen/RISCV/double_reduct.ll
  llvm/test/CodeGen/RISCV/rvv/combine-extractelement-vp-reduce.ll
  llvm/test/CodeGen/RISCV/rvv/fixed-vectors-reduction-fp.ll
  llvm/test/CodeGen/RISCV/rvv/fixed-vectors-reduction-int-vp.ll
  llvm/test/CodeGen/RISCV/rvv/fixed-vectors-reduction-int.ll
  llvm/test/CodeGen/RISCV/rvv/fold-binary-reduce.ll
  llvm/test/CodeGen/RISCV/rvv/vreductions-fp-sdnode.ll
  llvm/test/CodeGen/RISCV/rvv/vreductions-int-vp.ll
  llvm/test/CodeGen/RISCV/rvv/vreductions-int.ll

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