[PATCH] D84397: [MSP430] Replace known epilogues with branches to __mspabi_func_epilog_N

[Anatoly Trosinenko via Phabricator via llvm-commits]

atrosinenko created this revision.
atrosinenko added reviewers: krisb, pftbest.
Herald added subscribers: hiraditya, mgorny.
Herald added a project: LLVM.

Optimize the size of epilogue sequences by replacing common cases with a single branch to `__mspabi_func_epilog_<N>` function described in MSP430 EABI document <https://www.ti.com/lit/an/slaa534a/slaa534a.pdf>, part 3.8.

As part of that, the patch adjust handling of `MSP430::Bi` instruction.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D84397

Files:
  llvm/lib/Target/MSP430/CMakeLists.txt
  llvm/lib/Target/MSP430/MSP430.h
  llvm/lib/Target/MSP430/MSP430CommonEpilogueOptimizer.cpp
  llvm/lib/Target/MSP430/MSP430InstrInfo.cpp
  llvm/lib/Target/MSP430/MSP430TargetMachine.cpp
  llvm/test/CodeGen/MSP430/asm-clobbers.ll
  llvm/test/CodeGen/MSP430/mspabi-func-epilog-multi-terminators.mir
  llvm/test/CodeGen/MSP430/mspabi-func-epilog-special-cases.ll
  llvm/test/CodeGen/MSP430/mspabi-func-epilog.ll

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