[PATCH] D106649: [RISCV] Add tests showing missed vector saturating add/sub combines

[Fraser Cormack via Phabricator via llvm-commits]

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These will be optimized by upcoming patches. The tests are primarily not
being optimized due to the lack of support for saturating vector
arithmetic in the RISC-V backend.

On top of that, however, a large percentage of the scalable-vector tests
are also lacking support in the DAGCombiner: either in
`ISD::matchBinaryPredicate` or due to checks specifically for
`BUILD_VECTOR` and not `SPLAT_VECTOR`.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D106649

Files:
  llvm/test/CodeGen/RISCV/rvv/combine-sats.ll

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