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Partly revert invalid r41774

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42322 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Anton Korobeynikov 2007-09-25 21:52:30 +00:00
parent ee143ade09
commit 2fe1259d0a
1 changed files with 20 additions and 0 deletions

20
lib/Target/X86/X86ISelDAGToDAG.cpp

@ -130,6 +130,8 @@ namespace {
/// SelectionDAGISel when it has created a SelectionDAG for us to codegen.
virtual void InstructionSelectBasicBlock(SelectionDAG &DAG);
virtual void EmitFunctionEntryCode(Function &Fn, MachineFunction &MF);
virtual bool CanBeFoldedBy(SDNode *N, SDNode *U, SDNode *Root) const;
// Include the pieces autogenerated from the target description.
@ -162,6 +164,8 @@ namespace {
std::vector<SDOperand> &OutOps,
SelectionDAG &DAG);
void EmitSpecialCodeForMain(MachineBasicBlock *BB, MachineFrameInfo *MFI);
inline void getAddressOperands(X86ISelAddressMode &AM, SDOperand &Base,
SDOperand &Scale, SDOperand &Index,
SDOperand &Disp) {
@ -540,6 +544,22 @@ void X86DAGToDAGISel::InstructionSelectBasicBlock(SelectionDAG &DAG) {
} while (&*(MBBI++) != BB);
}
/// EmitSpecialCodeForMain - Emit any code that needs to be executed only in
/// the main function.
void X86DAGToDAGISel::EmitSpecialCodeForMain(MachineBasicBlock *BB,
MachineFrameInfo *MFI) {
const TargetInstrInfo *TII = TM.getInstrInfo();
if (Subtarget->isTargetCygMing())
BuildMI(BB, TII->get(X86::CALLpcrel32)).addExternalSymbol("__main");
}
void X86DAGToDAGISel::EmitFunctionEntryCode(Function &Fn, MachineFunction &MF) {
// If this is main, emit special code for main.
MachineBasicBlock *BB = MF.begin();
if (Fn.hasExternalLinkage() && Fn.getName() == "main")
EmitSpecialCodeForMain(BB, MF.getFrameInfo());
}
/// MatchAddress - Add the specified node to the specified addressing mode,
/// returning true if it cannot be done. This just pattern matches for the
/// addressing mode