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Make the following changes in MipsISelLowering.cpp:

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- Stop creating stack frame objects needed for saving $gp.
- Insert a node that copies the global pointer register to register $gp
  before the call node. This will ensure $gp is valid at the entry of the
  called function.

llvm-svn: 156692
This commit is contained in:
Akira Hatanaka 2012-05-12 03:19:04 +00:00
parent f6e9e7cbc7
commit ae43b7da61
1 changed files with 8 additions and 8 deletions
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16
lib/Target/Mips/MipsISelLowering.cpp
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@ -2455,11 +2455,6 @@ MipsTargetLowering::LowerCall(SDValue InChain, SDValue Callee,
Chain = CallSeqStart = DAG.getCALLSEQ_START(InChain, NextStackOffsetVal);
ByValChain = InChain;
// If this is the first call, create a stack frame object that points to
// a location to which .cprestore saves $gp.
if (IsO32 && IsPIC && MipsFI->globalBaseRegFixed() && !MipsFI->getGPFI())
MipsFI->setGPFI(MFI->CreateFixedObject(4, 0, true));
// Get the frame index of the stack frame object that points to the location
// of dynamically allocated area on the stack.
int DynAllocFI = MipsFI->getDynAllocFI();
@ -2482,9 +2477,6 @@ MipsTargetLowering::LowerCall(SDValue InChain, SDValue Callee,
NextStackOffset = (NextStackOffset + StackAlignment - 1) /
StackAlignment * StackAlignment;
if (MipsFI->needGPSaveRestore())
MFI->setObjectOffset(MipsFI->getGPFI(), NextStackOffset);
MFI->setObjectOffset(DynAllocFI, NextStackOffset);
}
@ -2656,6 +2648,14 @@ MipsTargetLowering::LowerCall(SDValue InChain, SDValue Callee,
Callee = DAG.getRegister(T9Reg, getPointerTy());
}
// Insert node "GP copy globalreg" before call to function.
// Lazy-binding stubs require GP to point to the GOT.
if (IsPICCall) {
unsigned GPReg = IsN64 ? Mips::GP_64 : Mips::GP;
EVT Ty = IsN64 ? MVT::i64 : MVT::i32;
RegsToPass.push_back(std::make_pair(GPReg, GetGlobalReg(DAG, Ty)));
}
// Build a sequence of copy-to-reg nodes chained together with token
// chain and flag operands which copy the outgoing args into registers.
// The InFlag in necessary since all emitted instructions must be