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Add PowerPC codegen for indirect branches.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86050 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bob Wilson
2009-11-04 21:31:18 +00:00
parent 0368e500eb
commit 3d90dbee69
6 changed files with 100 additions and 0 deletions
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33
lib/Target/PowerPC/PPCISelLowering.cpp
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@@ -196,10 +196,12 @@ PPCTargetLowering::PPCTargetLowering(PPCTargetMachine &TM)
// appropriate instructions to materialize the address.
setOperationAction(ISD::GlobalAddress, MVT::i32, Custom);
setOperationAction(ISD::GlobalTLSAddress, MVT::i32, Custom);
setOperationAction(ISD::BlockAddress, MVT::i32, Custom);
setOperationAction(ISD::ConstantPool, MVT::i32, Custom);
setOperationAction(ISD::JumpTable, MVT::i32, Custom);
setOperationAction(ISD::GlobalAddress, MVT::i64, Custom);
setOperationAction(ISD::GlobalTLSAddress, MVT::i64, Custom);
setOperationAction(ISD::BlockAddress, MVT::i64, Custom);
setOperationAction(ISD::ConstantPool, MVT::i64, Custom);
setOperationAction(ISD::JumpTable, MVT::i64, Custom);
@@ -1167,6 +1169,36 @@ SDValue PPCTargetLowering::LowerGlobalTLSAddress(SDValue Op,
return SDValue(); // Not reached
}
SDValue PPCTargetLowering::LowerBlockAddress(SDValue Op, SelectionDAG &DAG) {
EVT PtrVT = Op.getValueType();
DebugLoc DL = Op.getDebugLoc();
BlockAddress *BA = cast<BlockAddressSDNode>(Op)->getBlockAddress();
SDValue TgtBA = DAG.getBlockAddress(BA, DL, /*isTarget=*/true);
SDValue Zero = DAG.getConstant(0, PtrVT);
SDValue Hi = DAG.getNode(PPCISD::Hi, DL, PtrVT, TgtBA, Zero);
SDValue Lo = DAG.getNode(PPCISD::Lo, DL, PtrVT, TgtBA, Zero);
// If this is a non-darwin platform, we don't support non-static relo models
// yet.
const TargetMachine &TM = DAG.getTarget();
if (TM.getRelocationModel() == Reloc::Static ||
!TM.getSubtarget<PPCSubtarget>().isDarwin()) {
// Generate non-pic code that has direct accesses to globals.
// The address of the global is just (hi(&g)+lo(&g)).
return DAG.getNode(ISD::ADD, DL, PtrVT, Hi, Lo);
}
if (TM.getRelocationModel() == Reloc::PIC_) {
// With PIC, the first instruction is actually "GR+hi(&G)".
Hi = DAG.getNode(ISD::ADD, DL, PtrVT,
DAG.getNode(PPCISD::GlobalBaseReg,
DebugLoc::getUnknownLoc(), PtrVT), Hi);
}
return DAG.getNode(ISD::ADD, DL, PtrVT, Hi, Lo);
}
SDValue PPCTargetLowering::LowerGlobalAddress(SDValue Op,
SelectionDAG &DAG) {
EVT PtrVT = Op.getValueType();
@@ -4181,6 +4213,7 @@ SDValue PPCTargetLowering::LowerOperation(SDValue Op, SelectionDAG &DAG) {
switch (Op.getOpcode()) {
default: llvm_unreachable("Wasn't expecting to be able to lower this!");
case ISD::ConstantPool: return LowerConstantPool(Op, DAG);
case ISD::BlockAddress: return LowerBlockAddress(Op, DAG);
case ISD::GlobalAddress: return LowerGlobalAddress(Op, DAG);
case ISD::GlobalTLSAddress: return LowerGlobalTLSAddress(Op, DAG);
case ISD::JumpTable: return LowerJumpTable(Op, DAG);