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[Sparc] Rewrite MBB's live-in registers for leaf functions. Also, add

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register i7 as a live-in if current function's return address is taken.

This revision fixes PR16269.

llvm-svn: 187433
This commit is contained in:
Venkatraman Govindaraju 2013-07-30 19:53:10 +00:00
parent 4c06308b07
commit bc8be24d6c
2 changed files with 20 additions and 7 deletions
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11
lib/Target/Sparc/SparcFrameLowering.cpp
View File

@ -188,6 +188,17 @@ void SparcFrameLowering::remapRegsForLeafProc(MachineFunction &MF) const {
MRI.setPhysRegUnused(reg);
}
// Rewrite MBB's Live-ins.
for (MachineFunction::iterator MBB = MF.begin(), E = MF.end();
MBB != E; ++MBB) {
for (unsigned reg = SP::I0; reg <= SP::I7; ++reg) {
if (!MBB->isLiveIn(reg))
continue;
MBB->removeLiveIn(reg);
MBB->addLiveIn(reg - SP::I0 + SP::O0);
}
}
assert(verifyLeafProcRegUse(&MRI));
#ifdef XDEBUG
MF.verify(0, "After LeafProc Remapping");

16
lib/Target/Sparc/SparcISelLowering.cpp
View File

@ -1722,20 +1722,22 @@ static SDValue LowerFRAMEADDR(SDValue Op, SelectionDAG &DAG) {
return FrameAddr;
}
static SDValue LowerRETURNADDR(SDValue Op, SelectionDAG &DAG) {
MachineFrameInfo *MFI = DAG.getMachineFunction().getFrameInfo();
static SDValue LowerRETURNADDR(SDValue Op, SelectionDAG &DAG,
const SparcTargetLowering &TLI) {
MachineFunction &MF = DAG.getMachineFunction();
MachineFrameInfo *MFI = MF.getFrameInfo();
MFI->setReturnAddressIsTaken(true);
EVT VT = Op.getValueType();
SDLoc dl(Op);
unsigned RetReg = SP::I7;
uint64_t depth = Op.getConstantOperandVal(0);
SDValue RetAddr;
if (depth == 0)
if (depth == 0) {
unsigned RetReg = MF.addLiveIn(SP::I7,
TLI.getRegClassFor(TLI.getPointerTy()));
RetAddr = DAG.getCopyFromReg(DAG.getEntryNode(), dl, RetReg, VT);
else {
} else {
// Need frame address to find return address of the caller.
MFI->setFrameAddressIsTaken(true);
@ -1793,7 +1795,7 @@ LowerOperation(SDValue Op, SelectionDAG &DAG) const {
case ISD::FNEG:
case ISD::FABS: return LowerF64Op(Op, DAG);
case ISD::RETURNADDR: return LowerRETURNADDR(Op, DAG);
case ISD::RETURNADDR: return LowerRETURNADDR(Op, DAG, *this);
case ISD::FRAMEADDR: return LowerFRAMEADDR(Op, DAG);
case ISD::GlobalTLSAddress:
llvm_unreachable("TLS not implemented for Sparc.");