diff options
Diffstat (limited to 'llvm/lib/Target')
| -rw-r--r-- | llvm/lib/Target/PowerPC/PPCISelLowering.cpp | 29 |
1 files changed, 28 insertions, 1 deletions
diff --git a/llvm/lib/Target/PowerPC/PPCISelLowering.cpp b/llvm/lib/Target/PowerPC/PPCISelLowering.cpp index d5129d56887..1681406b396 100644 --- a/llvm/lib/Target/PowerPC/PPCISelLowering.cpp +++ b/llvm/lib/Target/PowerPC/PPCISelLowering.cpp @@ -170,7 +170,7 @@ PPCTargetLowering::PPCTargetLowering(PPCTargetMachine &TM) setOperationAction(ISD::VACOPY , MVT::Other, Expand); setOperationAction(ISD::VAEND , MVT::Other, Expand); setOperationAction(ISD::STACKSAVE , MVT::Other, Expand); - setOperationAction(ISD::STACKRESTORE , MVT::Other, Expand); + setOperationAction(ISD::STACKRESTORE , MVT::Other, Custom); setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i32 , Custom); setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i64 , Custom); @@ -1606,6 +1606,32 @@ static SDOperand LowerRET(SDOperand Op, SelectionDAG &DAG) { return DAG.getNode(PPCISD::RET_FLAG, MVT::Other, Copy, Copy.getValue(1)); } +static SDOperand LowerSTACKRESTORE(SDOperand Op, SelectionDAG &DAG, + const PPCSubtarget &Subtarget) { + // When we pop the dynamic allocation we need to restore the SP link. + + // Get the corect type for pointers. + MVT::ValueType PtrVT = DAG.getTargetLoweringInfo().getPointerTy(); + + // Construct the stack pointer operand. + bool IsPPC64 = Subtarget.isPPC64(); + unsigned SP = IsPPC64 ? PPC::X1 : PPC::R1; + SDOperand StackPtr = DAG.getRegister(SP, PtrVT); + + // Get the operands for the STACKRESTORE. + SDOperand Chain = Op.getOperand(0); + SDOperand SaveSP = Op.getOperand(1); + + // Load the old link SP. + SDOperand LoadLinkSP = DAG.getLoad(PtrVT, Chain, StackPtr, NULL, 0); + + // Restore the stack pointer. + Chain = DAG.getCopyToReg(LoadLinkSP.getValue(1), SP, SaveSP); + + // Store the old link SP. + return DAG.getStore(Chain, LoadLinkSP, StackPtr, NULL, 0); +} + static SDOperand LowerDYNAMIC_STACKALLOC(SDOperand Op, SelectionDAG &DAG, const PPCSubtarget &Subtarget) { MachineFunction &MF = DAG.getMachineFunction(); @@ -2587,6 +2613,7 @@ SDOperand PPCTargetLowering::LowerOperation(SDOperand Op, SelectionDAG &DAG) { return LowerFORMAL_ARGUMENTS(Op, DAG, VarArgsFrameIndex); case ISD::CALL: return LowerCALL(Op, DAG); case ISD::RET: return LowerRET(Op, DAG); + case ISD::STACKRESTORE: return LowerSTACKRESTORE(Op, DAG, PPCSubTarget); case ISD::DYNAMIC_STACKALLOC: return LowerDYNAMIC_STACKALLOC(Op, DAG, PPCSubTarget); |
