[PATCH] D148647: [RISCV] Fix interleave crash on unary interleaves

[Luke Lau via Phabricator via llvm-commits]

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We were crashing when lowering interleave shuffles like
(shuffle <0,3,1,4>, x:v4i8, y:v4i8)
Where it was technically an unary shuffle (both EvenSrc and OddSrc point
to the first operand), but the resulting extract_subvectors were out of
bounds.
This checks to make sure that the vectors being extracted are within
range.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D148647

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

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