[PATCH] D66805: [MIPS] For vectors, select `add %x, C` as `sub %x, -C` if it results in inline immediate

[Roman Lebedev via Phabricator via llvm-commits]

lebedev.ri updated this revision to Diff 217436.
lebedev.ri retitled this revision from "[MIPS] For vectors, select `add %x, -1` as `sub %x, 1`" to "[MIPS] For vectors, select `add %x, C` as `sub %x, -C` if it results in inline immediate".
lebedev.ri added a comment.

Generalize the check, do not limit the transform to `-1` specifically,
but rather all splat immediates if negating results in inline immediate (5-bit unsigned)


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D66805/new/

https://reviews.llvm.org/D66805

Files:
  llvm/lib/Target/Mips/MipsISelDAGToDAG.cpp
  llvm/lib/Target/Mips/MipsISelDAGToDAG.h
  llvm/test/CodeGen/Mips/msa/arithmetic.ll
  llvm/test/CodeGen/Mips/msa/i5-s.ll

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