[PATCH] D18514: [SystemZ] Support llvm.frameaddress/llvm.returnaddress intrinsics

[Bryan Chan via llvm-commits]

bryanpkc created this revision.
bryanpkc added a reviewer: uweigand.
bryanpkc added a subscriber: llvm-commits.

Enable the SystemZ back-end to lower FRAMEADDR and RETURNADDR, which previously would cause the back-end to crash. Also add a target attribute "backchain" to enable support for the optional back chain slot in the ABI, similar to the -mbackchain option in GCC. By default, this attribute is disabled and a non-zero frame count will result in an error.

http://reviews.llvm.org/D18514

Files:
  lib/Target/SystemZ/SystemZFrameLowering.cpp
  lib/Target/SystemZ/SystemZISelLowering.cpp
  lib/Target/SystemZ/SystemZISelLowering.h
  lib/Target/SystemZ/SystemZMachineFunctionInfo.h
  lib/Target/SystemZ/SystemZProcessors.td
  lib/Target/SystemZ/SystemZSubtarget.cpp
  lib/Target/SystemZ/SystemZSubtarget.h
  test/CodeGen/SystemZ/frameaddr-01.ll
  test/CodeGen/SystemZ/frameaddr-02.ll
  test/CodeGen/SystemZ/ret-addr-01.ll
  test/CodeGen/SystemZ/ret-addr-02.ll

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