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

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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.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34470 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2007-02-21 21:18:14 +00:00
parent 07d49acbf9
commit f46847172a
1 changed files with 14 additions and 0 deletions
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14
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);