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Make naked functions work on PPC.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102657 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dale Johannesen 2010-04-29 19:32:19 +00:00
parent 67a444ca36
commit 8c5358c936
2 changed files with 11 additions and 1 deletions
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4
lib/CodeGen/PrologEpilogInserter.cpp
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@ -197,6 +197,10 @@ void PEI::calculateCalleeSavedRegisters(MachineFunction &Fn) {
if (CSRegs == 0 || CSRegs[0] == 0)
return;
// In Naked functions we aren't going to save any registers.
if (Fn.getFunction()->hasFnAttr(Attribute::Naked))
return;
// Figure out which *callee saved* registers are modified by the current
// function, thus needing to be saved and restored in the prolog/epilog.
const TargetRegisterClass * const *CSRegClasses =

8
lib/Target/PowerPC/PPCRegisterInfo.cpp
View File

@ -409,6 +409,9 @@ PPCRegisterInfo::getCalleeSavedRegClasses(const MachineFunction *MF) const {
//
static bool needsFP(const MachineFunction &MF) {
const MachineFrameInfo *MFI = MF.getFrameInfo();
// Naked functions have no stack frame pushed, so we don't have a frame pointer.
if (MF.getFunction()->hasFnAttr(Attribute::Naked))
return false;
return DisableFramePointerElim(MF) || MFI->hasVarSizedObjects() ||
(GuaranteedTailCallOpt && MF.getInfo<PPCFunctionInfo>()->hasFastCall());
}
@ -794,7 +797,10 @@ PPCRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
// If we're not using a Frame Pointer that has been set to the value of the
// SP before having the stack size subtracted from it, then add the stack size
// to Offset to get the correct offset.
Offset += MFI->getStackSize();
// Naked functions have stack size 0, although getStackSize may not reflect that
// because we didn't call all the pieces that compute it for naked functions.
if (!MF.getFunction()->hasFnAttr(Attribute::Naked))
Offset += MFI->getStackSize();
// If we can, encode the offset directly into the instruction. If this is a
// normal PPC "ri" instruction, any 16-bit value can be safely encoded. If