[PATCH] D93171: [SystemZ] Improve handling of backchain offset

[Jonas Paulsson via Phabricator via llvm-commits]

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- New function SDValue getBackchainAddress() used by lowerDYNAMIC_STACKALLOC() and lowerSTACKRESTORE() to properly handle the backchain offset also with packed-stack.

- Make a function getBackchainOffset() for the computation of the backchain and use in three places (NFC).

A new test @f6 in backchain.ll, which is same as @f5 except for using packed-stack. I replaced the offsets as needed and hopefully the test should be correct.


https://reviews.llvm.org/D93171

Files:
  llvm/lib/Target/SystemZ/SystemZFrameLowering.cpp
  llvm/lib/Target/SystemZ/SystemZFrameLowering.h
  llvm/lib/Target/SystemZ/SystemZISelLowering.cpp
  llvm/lib/Target/SystemZ/SystemZISelLowering.h
  llvm/test/CodeGen/SystemZ/backchain.ll

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