[PATCH] D19182: AArch64: Use SplitCSR for callee save registers used for parameters.

[Matthias Braun via llvm-commits]

MatzeB created this revision.
MatzeB added reviewers: qcolombet, manmanren.
MatzeB added a subscriber: llvm-commits.
MatzeB set the repository for this revision to rL LLVM.
Herald added subscribers: mcrosier, rengolin, aemerson.

Callee save parameters that are also used to pass parameter values
should use virtual regs for save/restore to avoid unnecessary spills.

This is done by determining a list of callee saves (the ones handled in
FrameLowering) and SavedViaCopy (register is copied to a vreg so the
register allocator handles saving/restoring).

Related to rdar://25638054

Repository:
  rL LLVM

http://reviews.llvm.org/D19182

Files:
  include/llvm/CodeGen/MachineFunction.h
  lib/Target/AArch64/AArch64ISelLowering.cpp
  lib/Target/AArch64/AArch64MachineFunctionInfo.h
  lib/Target/AArch64/AArch64RegisterInfo.cpp
  lib/Target/AArch64/AArch64RegisterInfo.h
  test/CodeGen/AArch64/swiftself.ll

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