[PATCH] D141264: [AVR] Fix incorrect expansion of pseudo instructions LPMWRdZ/ELPMWRdZ

[Ben Shi via Phabricator via llvm-commits]

benshi001 created this revision.
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The `ELPM` instruction has three forms:

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

| form        | feature  |
| ----------- | -------- |
| ELPM        | hasELPM  |
| ELPM Rd, Z  | hasELPMX |
| ELPM Rd, Z+ | hasELPMX |
|

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

The second form is always used in the expansion of pseudo instructions
`LPMWRdZ`/`ELPMWRdZ`. But for devices without `ELPMX` and with only `ELPM`,
only the first form can be used.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D141264

Files:
  llvm/lib/Target/AVR/AVRExpandPseudoInsts.cpp
  llvm/test/CodeGen/AVR/elpm.ll
  llvm/test/CodeGen/AVR/pseudo/ELPMWRdZ.mir

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