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Make the following changes in MipsFrameLowering.cpp:

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- Stop emitting instructions needed to initialize the global pointer register.
- Stop emitting .cprestore directive.
- Do not take into account the $gp save slot when computing stack size.

llvm-svn: 156691
This commit is contained in:
Akira Hatanaka 2012-05-12 03:18:00 +00:00
parent afe973fad4
commit f6e9e7cbc7
1 changed files with 3 additions and 32 deletions
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35
lib/Target/Mips/MipsFrameLowering.cpp
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@ -136,7 +136,6 @@ void MipsFrameLowering::emitPrologue(MachineFunction &MF) const {
*static_cast<const MipsInstrInfo*>(MF.getTarget().getInstrInfo());
MachineBasicBlock::iterator MBBI = MBB.begin();
DebugLoc dl = MBBI != MBB.end() ? MBBI->getDebugLoc() : DebugLoc();
bool isPIC = (MF.getTarget().getRelocationModel() == Reloc::PIC_);
unsigned SP = STI.isABI_N64() ? Mips::SP_64 : Mips::SP;
unsigned FP = STI.isABI_N64() ? Mips::FP_64 : Mips::FP;
unsigned ZERO = STI.isABI_N64() ? Mips::ZERO_64 : Mips::ZERO;
@ -144,35 +143,14 @@ void MipsFrameLowering::emitPrologue(MachineFunction &MF) const {
unsigned ADDiu = STI.isABI_N64() ? Mips::DADDiu : Mips::ADDiu;
// First, compute final stack size.
unsigned RegSize = STI.isGP32bit() ? 4 : 8;
unsigned StackAlign = getStackAlignment();
unsigned LocalVarAreaOffset = MipsFI->needGPSaveRestore() ?
(MFI->getObjectOffset(MipsFI->getGPFI()) + RegSize) :
MipsFI->getMaxCallFrameSize();
uint64_t StackSize = RoundUpToAlignment(LocalVarAreaOffset, StackAlign) +
RoundUpToAlignment(MFI->getStackSize(), StackAlign);
uint64_t StackSize =
RoundUpToAlignment(MipsFI->getMaxCallFrameSize(), StackAlign) +
RoundUpToAlignment(MFI->getStackSize(), StackAlign);
// Update stack size
MFI->setStackSize(StackSize);
// Emit instructions that set the global base register if the target ABI is
// O32.
if (isPIC && MipsFI->globalBaseRegSet() && STI.isABI_O32() &&
!MipsFI->globalBaseRegFixed()) {
// See MipsInstrInfo.td for explanation.
MachineBasicBlock *NewEntry = MF.CreateMachineBasicBlock();
MF.insert(&MBB, NewEntry);
NewEntry->addSuccessor(&MBB);
// Copy live in registers.
for (MachineBasicBlock::livein_iterator R = MBB.livein_begin();
R != MBB.livein_end(); ++R)
NewEntry->addLiveIn(*R);
BuildMI(*NewEntry, NewEntry->begin(), dl, TII.get(Mips:: SETGP01),
Mips::V0);
}
// No need to allocate space on the stack.
if (StackSize == 0 && !MFI->adjustsStack()) return;
@ -251,13 +229,6 @@ void MipsFrameLowering::emitPrologue(MachineFunction &MF) const {
SrcML = MachineLocation(MachineLocation::VirtualFP);
Moves.push_back(MachineMove(SetFPLabel, DstML, SrcML));
}
// Restore GP from the saved stack location
if (MipsFI->needGPSaveRestore()) {
unsigned Offset = MFI->getObjectOffset(MipsFI->getGPFI());
BuildMI(MBB, MBBI, dl, TII.get(Mips::CPRESTORE)).addImm(Offset)
.addReg(Mips::GP);
}
}
void MipsFrameLowering::emitEpilogue(MachineFunction &MF,