[PATCH] D27650: [AVR] Add an 'relax memory operation' pass

[Dylan McKay via Phabricator via llvm-commits]

dylanmckay created this revision.
dylanmckay added reviewers: kparzysz, arsenm.
dylanmckay added a subscriber: llvm-commits.
Herald added subscribers: mgorny, wdng.

This pass will be used to relax instructions which use out of bounds
memory accesses to equivalent operations that can work with the
addresses.

The pass currently implements relaxation for the STDWPtrQRr instruction.

Without this pass, an assertion error would be hit in the pseudo expansion pass.

In the future, we will need to add more instructions to this pass. We can do
that on a case-by-case basic.


https://reviews.llvm.org/D27650

Files:
  lib/Target/AVR/AVR.h
  lib/Target/AVR/AVRFrameLowering.cpp
  lib/Target/AVR/AVRRelaxMemOperations.cpp
  lib/Target/AVR/AVRTargetMachine.cpp
  lib/Target/AVR/CMakeLists.txt
  test/CodeGen/AVR/relax-mem/STDWPtrQRr.mir

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