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ELF / PIC requires GOT be in the EBX register during calls via PLT GOT pointer. 

Add implicit uses of EBX to calls to ensure liveintervalanalysis does not treat
the GOT in EBX move as dead upon definition.
This should fix PR1207.

llvm-svn: 34470
This commit is contained in:
Evan Cheng 2007-02-21 21:18:14 +00:00
parent a673b600c8
commit 84a041eb98
1 changed files with 14 additions and 0 deletions
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14
llvm/lib/Target/X86/X86ISelLowering.cpp
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@ -794,6 +794,8 @@ SDOperand X86TargetLowering::LowerCCCCallTo(SDOperand Op, SelectionDAG &DAG,
InFlag = Chain.getValue(1);
}
// ELF / PIC requires GOT in the EBX register before function calls via PLT
// GOT pointer.
if (getTargetMachine().getRelocationModel() == Reloc::PIC_ &&
Subtarget->isPICStyleGOT()) {
Chain = DAG.getCopyToReg(Chain, X86::EBX,
@ -825,6 +827,11 @@ SDOperand X86TargetLowering::LowerCCCCallTo(SDOperand Op, SelectionDAG &DAG,
for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i)
Ops.push_back(DAG.getRegister(RegsToPass[i].first,
RegsToPass[i].second.getValueType()));
// Add an implicit use GOT pointer in EBX.
if (getTargetMachine().getRelocationModel() == Reloc::PIC_ &&
Subtarget->isPICStyleGOT())
Ops.push_back(DAG.getRegister(X86::EBX, getPointerTy()));
if (InFlag.Val)
Ops.push_back(InFlag);
@ -1788,6 +1795,8 @@ SDOperand X86TargetLowering::LowerFastCCCallTo(SDOperand Op, SelectionDAG &DAG,
} else if (ExternalSymbolSDNode *S = dyn_cast<ExternalSymbolSDNode>(Callee))
Callee = DAG.getTargetExternalSymbol(S->getSymbol(), getPointerTy());
// ELF / PIC requires GOT in the EBX register before function calls via PLT
// GOT pointer.
if (getTargetMachine().getRelocationModel() == Reloc::PIC_ &&
Subtarget->isPICStyleGOT()) {
Chain = DAG.getCopyToReg(Chain, X86::EBX,
@ -1809,6 +1818,11 @@ SDOperand X86TargetLowering::LowerFastCCCallTo(SDOperand Op, SelectionDAG &DAG,
Ops.push_back(DAG.getRegister(RegsToPass[i].first,
RegsToPass[i].second.getValueType()));
// Add an implicit use GOT pointer in EBX.
if (getTargetMachine().getRelocationModel() == Reloc::PIC_ &&
Subtarget->isPICStyleGOT())
Ops.push_back(DAG.getRegister(X86::EBX, getPointerTy()));
if (InFlag.Val)
Ops.push_back(InFlag);