[PATCH] D153411: [RISCV] Custom lower fixed vector undef to scalable undef

[Luke Lau via Phabricator via llvm-commits]

luke created this revision.
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This avoids undefs from being expanded to a build vector of zeroes.
As noted by @craig.topper in D153399 <https://reviews.llvm.org/D153399>


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D153411

Files:
  llvm/lib/Target/RISCV/RISCVISelLowering.cpp
  llvm/test/CodeGen/RISCV/rvv/fixed-vectors-int-shuffles.ll
  llvm/test/CodeGen/RISCV/rvv/fixed-vectors-unaligned.ll
  llvm/test/CodeGen/RISCV/rvv/shuffle-reverse.ll
  llvm/test/CodeGen/RISCV/rvv/vector-interleave-fixed.ll

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