[PATCH] D111662: [SystemZ][z/OS] Initial implementation for lowerCall on z/OS

[Anirudh Prasad via Phabricator via llvm-commits]

anirudhp created this revision.
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- This patch provides the initial implementation for lowering a call on z/OS according to the XPLINK64 calling convention
- A series of changes have been made to SystemZCallingConv.td to account for these additional XPLINK64 changes including adding a new helper function to shadow the stack along with allocation of a register wherever appropriate
- For the cases of copying a f64 to a gr64 and a f128 / 128-bit vector type to a gr64, a `CCBitConvertToType` has been added and has been bitcasted appropriately in the lowering phase
- Support for the ADA register (R5 <https://reviews.llvm.org/source/polly/>) will be provided in a later patch.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D111662

Files:
  llvm/lib/Target/SystemZ/SystemZCallingConv.cpp
  llvm/lib/Target/SystemZ/SystemZCallingConv.h
  llvm/lib/Target/SystemZ/SystemZCallingConv.td
  llvm/lib/Target/SystemZ/SystemZISelLowering.cpp
  llvm/lib/Target/SystemZ/SystemZRegisterInfo.h
  llvm/lib/Target/TargetMachine.cpp
  llvm/test/CodeGen/SystemZ/call-zos-01.ll
  llvm/test/CodeGen/SystemZ/call-zos-vararg.ll
  llvm/test/CodeGen/SystemZ/call-zos-vec.ll

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