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Provide set of reserved registers

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@70704 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Anton Korobeynikov 2009-05-03 13:00:11 +00:00
parent fd1b7c778c
commit dcb802cf7b
2 changed files with 17 additions and 5 deletions
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8
lib/Target/MSP430/MSP430ISelLowering.cpp
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@ -80,8 +80,8 @@ SDValue MSP430TargetLowering::LowerFORMAL_ARGUMENTS(SDValue Op,
/// generate load operations for arguments places on the stack.
// FIXME: struct return stuff
// FIXME: varargs
SDValue MSP430TargetLowering:: LowerCCCArguments(SDValue Op,
SelectionDAG &DAG) {
SDValue MSP430TargetLowering::LowerCCCArguments(SDValue Op,
SelectionDAG &DAG) {
MachineFunction &MF = DAG.getMachineFunction();
MachineFrameInfo *MFI = MF.getFrameInfo();
MachineRegisterInfo &RegInfo = MF.getRegInfo();
@ -193,8 +193,8 @@ SDValue MSP430TargetLowering::LowerRET(SDValue Op, SelectionDAG &DAG) {
Chain = DAG.getCopyToReg(Chain, dl, VA.getLocReg(),
Op.getOperand(i*2+1), Flag);
// guarantee that all emitted copies are
// stuck together, avoiding something bad
// Guarantee that all emitted copies are stuck together,
// avoiding something bad.
Flag = Chain.getValue(1);
}

14
lib/Target/MSP430/MSP430RegisterInfo.cpp
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@ -38,7 +38,19 @@ MSP430RegisterInfo::getCalleeSavedRegClasses(const MachineFunction *MF) const {
BitVector
MSP430RegisterInfo::getReservedRegs(const MachineFunction &MF) const {
assert(0 && "Not implemented yet!");
BitVector Reserved(getNumRegs());
// Mark 4 special registers as reserved.
Reserved.set(MSP430::PC);
Reserved.set(MSP430::SP);
Reserved.set(MSP430::SR);
Reserved.set(MSP430::CG);
// Mark frame pointer as reserved if needed.
if (hasFP(MF))
Reserved.set(MSP430::FP);
return Reserved;
}
bool MSP430RegisterInfo::hasFP(const MachineFunction &MF) const {