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ARM: consolidate frame pointer register knowledge 

Use the ARMBaseRegisterInfo to query the frame register.  The base register info
is aware of the frame register that is used for the frame pointer.  Use that to
determine the frame register rather than duplicating the knowledge.  Although,
the code path is slightly different in that it may return SP, that can only
occur if the frame pointer has been omitted in the machine function, which is
supposed to contain the desired value in that case.

llvm-svn: 209084
This commit is contained in:
Saleem Abdulrasool 2014-05-18 03:18:09 +00:00
parent d2d442ca73
commit f11f4b4e20
1 changed files with 5 additions and 3 deletions
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8
llvm/lib/Target/ARM/ARMISelLowering.cpp
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@ -3930,14 +3930,16 @@ SDValue ARMTargetLowering::LowerRETURNADDR(SDValue Op, SelectionDAG &DAG) const{
}
SDValue ARMTargetLowering::LowerFRAMEADDR(SDValue Op, SelectionDAG &DAG) const {
MachineFrameInfo *MFI = DAG.getMachineFunction().getFrameInfo();
const ARMBaseRegisterInfo &ARI =
*static_cast<const ARMBaseRegisterInfo*>(RegInfo);
MachineFunction &MF = DAG.getMachineFunction();
MachineFrameInfo *MFI = MF.getFrameInfo();
MFI->setFrameAddressIsTaken(true);
EVT VT = Op.getValueType();
SDLoc dl(Op); // FIXME probably not meaningful
unsigned Depth = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
unsigned FrameReg = (Subtarget->isThumb() || Subtarget->isTargetMachO())
? ARM::R7 : ARM::R11;
unsigned FrameReg = ARI.getFrameRegister(MF);
SDValue FrameAddr = DAG.getCopyFromReg(DAG.getEntryNode(), dl, FrameReg, VT);
while (Depth--)
FrameAddr = DAG.getLoad(VT, dl, DAG.getEntryNode(), FrameAddr,