[PATCH] D88658: [AVR] Optimize the 16-bit NEGW pseudo instruction

[Ben Shi via Phabricator via llvm-commits]

benshi001 created this revision.
benshi001 added reviewers: dylanmckay, aykevl.
Herald added subscribers: llvm-commits, Jim, hiraditya.
Herald added a project: LLVM.
benshi001 requested review of this revision.

Optimize "NEGW 'Rd+1 : Rd' to

neg  Rd+1
neg  Rd
sbci Rd+1, 0


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D88658

Files:
  llvm/lib/Target/AVR/AVRExpandPseudoInsts.cpp
  llvm/lib/Target/AVR/AVRInstrInfo.td
  llvm/test/CodeGen/AVR/pseudo/NEGWRd.mir

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