[PATCH] D141246: [AVR] Do not emit 'LPM Rd, Z' on devices without FeatureLPMX

[Ben Shi via Phabricator via llvm-commits]

benshi001 created this revision.
benshi001 added reviewers: aykevl, dylanmckay.
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The 'LPM' instruction has three forms:

------------------------

| form       | feature |
| ---------- | ------- |
| LPM        | hasLPM  |
| LPM Rd, Z  | hasLPMX |
| LPM Rd, Z+ | hasLPMX |
|

------------------------

The second form is always selected in ISelDAGToDAG, even on devices
without FeatureLPMX. This patch emits "LPM + MOV" on devices with
only FeatureLPM.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D141246

Files:
  llvm/lib/Target/AVR/AVRExpandPseudoInsts.cpp
  llvm/lib/Target/AVR/AVRISelDAGToDAG.cpp
  llvm/lib/Target/AVR/AVRInstrInfo.td
  llvm/test/CodeGen/AVR/elpm.ll

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