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Make naked functions work on PPC.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102657 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -197,6 +197,10 @@ void PEI::calculateCalleeSavedRegisters(MachineFunction &Fn) {
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if (CSRegs == 0 || CSRegs[0] == 0)
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return;
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// In Naked functions we aren't going to save any registers.
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if (Fn.getFunction()->hasFnAttr(Attribute::Naked))
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return;
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// Figure out which *callee saved* registers are modified by the current
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// function, thus needing to be saved and restored in the prolog/epilog.
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const TargetRegisterClass * const *CSRegClasses =
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@ -409,6 +409,9 @@ PPCRegisterInfo::getCalleeSavedRegClasses(const MachineFunction *MF) const {
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//
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static bool needsFP(const MachineFunction &MF) {
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const MachineFrameInfo *MFI = MF.getFrameInfo();
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// Naked functions have no stack frame pushed, so we don't have a frame pointer.
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if (MF.getFunction()->hasFnAttr(Attribute::Naked))
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return false;
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return DisableFramePointerElim(MF) || MFI->hasVarSizedObjects() ||
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(GuaranteedTailCallOpt && MF.getInfo<PPCFunctionInfo>()->hasFastCall());
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}
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@ -794,6 +797,9 @@ PPCRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
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// If we're not using a Frame Pointer that has been set to the value of the
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// SP before having the stack size subtracted from it, then add the stack size
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// to Offset to get the correct offset.
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// Naked functions have stack size 0, although getStackSize may not reflect that
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// because we didn't call all the pieces that compute it for naked functions.
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if (!MF.getFunction()->hasFnAttr(Attribute::Naked))
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Offset += MFI->getStackSize();
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// If we can, encode the offset directly into the instruction. If this is a
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