MIR support is totally unusable for AMDGPU without this, since the set
of reserved registers is set from fields here.
Add a clone method to MachineFunctionInfo. This is a subtle variant of
the copy constructor that is required if there are any MIR constructs
that use pointers. Specifically, at minimum fields that reference
MachineBasicBlocks or the MachineFunction need to be adjusted to the
values in the new function.
Fixes the following warnings observerd when building the experimental
m68k backend (-DLLVM_EXPERIMENTAL_TARGETS_TO_BUILD="M68k"):
../lib/Target/M68k/M68kMachineFunction.h:71:3: warning: explicitly
defaulted default constructor is implicitly deleted
[-Wdefaulted-function-deleted]
M68kMachineFunctionInfo() = default;
^
../lib/Target/M68k/M68kMachineFunction.h:24:20: note: default
constructor of 'M68kMachineFunctionInfo' is implicitly deleted because
field 'MF' of reference type 'llvm::MachineFunction &' would not be
initialized
MachineFunction &MF;
^
In file included from ../lib/Target/M68k/M68kISelLowering.cpp:18:
In file included from ../lib/Target/M68k/M68kSubtarget.h:17:
../lib/Target/M68k/M68kFrameLowering.h:60:8: warning:
'llvm::M68kFrameLowering::emitCalleeSavedFrameMoves' hides overloaded
virtual functions [-Woverloaded-virtual]
void emitCalleeSavedFrameMoves(MachineBasicBlock &MBB,
^
../include/llvm/CodeGen/TargetFrameLowering.h:215:3: note: hidden
overloaded virtual function
'llvm::TargetFrameLowering::emitCalleeSavedFrameMoves' declared here:
different number of parameters (2 vs 3)
emitCalleeSavedFrameMoves(MachineBasicBlock &MBB,
^
../include/llvm/CodeGen/TargetFrameLowering.h:218:16: note: hidden
overloaded virtual function
'llvm::TargetFrameLowering::emitCalleeSavedFrameMoves' declared here:
different number of parameters (4 vs 3)
virtual void emitCalleeSavedFrameMoves(MachineBasicBlock &MBB,
^
pr/50071
Reviewed By: myhsu
Differential Revision: https://reviews.llvm.org/D101588
